D33 piezo constant for some composite materials.
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\r\n\tRecognition of these items in different organisms drives us to know more about the characteristics of DNA repair systems in different types of organisms. Hopefully, this book will offer an interesting read by introducing, explaining and comparing these diversities.
Within the past 5 decades the use of ferroelectric composite made of ferroelectric ceramic immersed in polymer matrix has expanded significantly. One of the goals to embedding ceramic grains within a polymer matrix to form a 0-3 composite film is to combine the better properties of each phase, such as high piezoelectric activity of the ceramic and the mechanical resistance, formability and flexibility of the polymer, also because the 0-3 composite is the easier and cheaper way to fabricate this alternative electro-active material.
Some desirable properties for composite materials are: high piezoelectric charge and voltage coefficients for passive piezoelectric devices; large piezoelectric charge coefficient and low relative dielectric constant for active devices. Furthermore, the poling process of the composite film should be effective, which impose the composite must be homogeneously fabricated, i.e., the composite film should have uniformly dispersed ceramic grain.
Piezoelectric devices have some specific advantages over electromagnetic such as suitability to be miniaturized; there is no need of magnetic shielding; it is more efficient at least in the lower power range. There is a very large range of applications of piezoelectric materials, either as sensing element or as actuators. One of the most recent interests on piezoelectric materials is energy harvesting, converting mechanical to electrical energy. The aim of this research area is to provide clean energy attending the needs of the world in the fight against pollution.
Conventional ferroelectric materials such as lead zirconate titanate (PZT) [Jaffe 1969, Ren 2003, Klee 2010], modified lead titanate [Wang 2000, Chu 2004, Pontes 2001] and ferroelectric polymers [Lovinger 1983, Kawai 1969, Bauer 2000] have been used in applications which use either piezo or pyroelectric properties. Concerned to the piezoelectric applications, they have been employed in a large range of transducers such as for hydrophone [Lau 2002, Boumchedda 2007], dynamic strain measurements [Soman 2011], medical ultrasound [Zhang 2006, Muralt 2004] and non-destructive evaluation of structures [Brown 1996, Ciang 2008, Edwards 2006].
On the pyroelectric applications, ferroelectric materials can be used as infrared detectors [Sosnin 2000, Huang 2002, Guggilla 2006] and X-ray intensity measurements [De Paula 2005, Pontes 2010, De Carvalho 1997]. Using the pyroelectric property of the sensing element, KUBE Electronics AG (Switzerland) has developed a flame detection and gas analysis device [
Ferroelectric ceramics have high piezo and pyroelectric properties but, for some applications, their poor mechanical properties and the mismatch of the acoustic impedance with water and human tissue restrict their usage. On the other hand, ferroelectric polymers have mechanical flexibility and formability but their piezo and pyroelectric activity are low. To overcome these problems composite materials made of ferroelectric ceramic and polymer have been investigated as an alternative material which combine the better properties of ceramic and polymer [Furukawa 1976, Dias 1996, Sakamoto 2006, Wong 2006, Kumar 2005, Estevam 2011, Feng 2010].
According to Newnham and co-workers [Newnham 1978] there are ten connectivity patterns in which a two phase composite system can be fabricated, ranging from unconnected 0-0 pattern to a 3-3 pattern in which both phases are three dimensionally self-connected. The easier and cheaper composite to obtain is the 0-3 pattern, that means the ceramic grains are dispersed (unconnected) into a polymer matrix (self-connected three dimensionally). The main goal of embedding ferroelectric ceramic grains within a polymer matrix is to obtain a material which displays the combined better properties of each single phase. However it is very difficult to obtain a 0-3 composite with high ceramic content. There are basically two problems: high ceramic content will provide a mixed connectivity due to the percolation of the grains; high ceramic concentration means low flexibility of the composite material.
But these problems have not drawn the interest of researchers in using the 0-3 composite, on the contrary, it intensified the search for optimum results and many studies on the polarization of the composites have been conducted [Furukawa 1986, Lau 2007, Ploss 2001, Wong 2002]. Still seeking a more effective polarization of the composite material, studies with the inclusion of a semiconductor phase were carried out [Sa-Gong 1986, Sakamoto 2002, Renxin 2006, Ploss 2006, Chau 2007]. These efforts were not in vain and 0-3 composites are being used as sensors and transducers, and is now a well-established alternative to conventional ferroelectric materials for many applications. New methods of preparing ferroelectric ceramics have also been studied and the latest is the hydrothermal method for obtaining ceramic powder [Shimomura 1991, Morita 2010]. The grain size and structure are also objects of study.
This work presents the preparation and characterization of PZT ceramic obtained by different methods. The influence of the synthesis method on the grain size and the morphology are also object of study. The fabrication and characterization of composite films with 0-3 connectivity, immersing nanoparticles of PZT into the non-polar poly(vinylidene fluoride) – PVDF as the polymer matrix were presented. For comparison there are some results obtained with composite samples made of ceramic particles recovered with a conducting polymer and also using the conducting polymer as a third phase. Moreover it presents the results obtained with the new material that includes a semiconductor phase, polyaniline – PAni as a sensing material and as a piezoelectric material for energy harvesting. In this sample the PZT grain was partially covered by PAni, which allowed better distribution of grains in the polymer matrix in comparison with the inclusion of the 3rd phase separately, avoiding a continuous electrical flux path which does not allow the polarization process of the composite sample. The use of this composite as sensor and power converter is an indicative that it is a good alternative for technological applications.
The control of some parameters is important to achieve the desired properties in lead zirconate titanate (PZT) materials. These parameters include the absence of intermediate crystalline phases, a defined and fixed stoichiometry, as well as a homogeneous distribution of lead in the material. Lead zirconate titanate (PZT) is a very interesting ceramic that has good piezoelectric properties used to making ultrasonic transducers, filters and pyroelectric detectors [Haertling 1999]. This material can be prepared using different ways but the most important is using low temperature to obtain the crystalline phase. This condition promotes the homogeneous lead distribution and consequently occurs the formation of pure phase PZT. The presence of secondary phases reduces the dielectric and piezoelectric constants [Zaghete 1999, Zaghete 1992]. To minimize theses problems some chemicals processes has been proposed as the optional procedure. Methods such as sol-gel [Ishikawa 1994], hydrothermal synthesis [Pan 2007, Abothu 1999] and Pechini\'s method [Zaghete 1992] can be used.
It is known that ceramic materials prepared from chemical solutions routes are transformed via a nucleation and growth process, often requiring high temperatures to surmount the large energy barriers of the nucleation and growth of the stable phase. Consequently, these energy barriers frequently determine the calcinations conditions and therefore the characteristics such as, particle size, morphology and degree of aggregation of the precursor powder. The most significant advance in this field, however, consists of the ability to control phase development at low calcinations temperatures to avoid lead evaporation.
The expected phase equilibrium (perovskite) may grow starting from a gel matrix under a nucleus along a certain crystallographic orientation. This type of heterogeneous nucleation eliminates the need for the system to exceed the activation energy required to form the nucleus, as in the case of systems with homogeneous nucleation. As a result, the perovskite phase may crystallize at lower temperatures.
The present study show the influence of synthesis method on size and morphologic distribution of particle and the amount of perovskits phase synthesized at different temperatures. The procedure of PZT synthesis, based on Pechini’s method [Zaghete 1992] makes use of the capability that certain α-hydroxycarboxylic organic acids possess of forming polybasic acid chelates with several cations. When mixing with a polyhydroxylic alcohol and heating, the chelate transforms into a polymer, maintaining the cations homogeneously distributed.
The organic part is eliminated at low temperatures forming reactive oxides with well-controlled stoichiometry. Pure PZT with composition Pb(Zr0.48Ti0.52)O3 can be prepared from the metal-citrate complex polyesterified in ethylene glycol. Appropriate quantities of Zr, Ti and Pb solutions were mixed and homogenized by stirring at 90ºC for 3 h. Next, the temperature was increased to 130-140ºC, yielding a high viscous polyester resin. The powder was calcined at 600, 700 and 800ºC for 2h and ball milled for 2h in isopropylic alcohol medium.
Recently, the hydrothermal synthesis has been widely used in the study of these materials for the production of particles with nanometric sizes, high purity and crystallinity, good stoichiometric control and good yield. There are few reports relating to the study on the PZT synthesized by the hydrothermal method in literature. In one of these works, PZT powder was obtained with cubic morphology and crystalline phase by hydrothermal synthesis [PAN 2007]. By controlling the variables process of the synthesis, it becomes possible to change the morphology, the particle size, as well as the hydrothermal synthesis assisted by microwave method that has the advantage of producing rapid heating, thereby promoting homogeneous nucleation of particles [Moreira 2009, Rao 1999].
Hydrothermal media provide an effective reaction environment for the synthesis of numerous ceramic materials because of the combined effects of solvent, temperature, and pressure on ionic reaction equilibrium. The conventional hydrothermal method has become an effective synthetic route in Materials science by dramatically increasing the control of the micro/nanometric morphology and orientation [LUO 2008]. In addition, this method is environmentally friendly and depends on the solubility of the chemical salts in water under temperature and pressure conditions.
The key factors in this method are the vapor pressure and solubility of the chemical salts in water [Lencka 1995]. In contrast to the conventional hydrothermal method which requires a long time typically several days and high electric power (over thousand watts) [Dutta 1994], microwave-assisted heating is a greener approach to synthesize materials within a shorter time typically several minutes to some few hours less than the duration of the conventional method and with lower energy consumption (hundreds of watts).
The desired PZT product can be synthesized using Pb(NO3)2, ZrOCl2.8H2O, TiO2, KOH. At first, a suspension containing ZrOC2.8H2O, Pb(NO3)2 and TiO2 was prepared in aqueous medium. After that, KOH aqueous solution containing 3.31g of KOH (1.84 mol.L-1, pH=14). was add to the precursor suspension and then kept at room temperature under stirring for approximately 20 minutes. It was further placed containing all the reagents in Teflon jars, sealed and taken to the microwave for the synthesis of PZT powder.
The synthesis temperature was 180ºC and the lower time used to obtain PZT was 0.5 hour, under constant pressure of approximately 10 Bar. The PZT powders were synthesized using microwave-assisted hydrothermal digester (MARS CEM, USA). The precursor was further again loaded into a 90 mL Tefflon autoclave reaching 30% of its volume. The autoclave was sealed and placed into a microwave-assisted hydrothermal system using 2.45 GHz microwave radiation with a maximum output power of 800 W. Then the solid product was washed with distilled water until a neutral pH was obtained and was further dried at room temperature.
X-ray diffraction patterns for PZT powders synthesized by Pechini method at different temperatures of calcination and hydrothermal synthesis assisted by microwaves.
Diagrams of particles size distribution of PZT synthesized by the Pechini’s method calcimine at (a) 600ºC; (b) 700ºC ; (c) 800ºC and (d) synthesized by hydrothermal microwave method at 180ºC/1h.
FEG-SEM images of PZT nanostructures synthesized by Pechini’s method: (a) 600ºC/3h; (b) 700ºC/3h, (c) 800ºC/3h and (d) synthesized by hydrothermal microwave method at 180ºC/1h.
The obtained powders were characterized by X-ray powder diffraction using a Rigaku, DMax 2500PC with rotator anode at 50 kV and 150 mA, Cu Kα radiation in the 2θ range from 20º to 80º with 0.02ºmin-1. A field emission gun scanning electron microscope (SEM-FEG)-ZEISS SUPRA 35 microscope was used to analyze the shape and size of particles; energy dispersive X-ray microanalysis spectroscopy (EDS) was used for compositional determination. All measurements were taken at room temperature.
Today it is well known the effectiveness of the synthesis rote on the perovskits phase formation but it isn\'t well understood the influence of the particle size on the composite properties. Some of results obtained for PZT prepared by pechini´s method and synthesis hydrothermal assisted by microwave were presented to show the different characteristic as function of the synthesis way.
The analysis of the crystal structure of the material indicated mixture of the tetragonal and rhombohedral phase that is characteristics of the morphotropic phase transition region (YU 2007) Figure 1. When prepared by the Pechini’s method has been the formation of pure crystalline phase from 600ºC, the same result can be observed with hydrothermal treatment at 180ºC for 1 hour. Also is possible to observe that the distribution of particle size and average particle size are directly affected by the temperature of thermal treatment as well as by the synthesis process, Figures 2 and 3. The purity of the composition was analyzed by EDS and found a homogeneous distribution of Pb, Ti, Zr on the surface of the entire sample as showed in Figure 4.
Energy dispersive scanning, EDS, results of PZT prepared by Pechini’s Method at (a) 700ºC/3h and (b) synthesized by the hydrothermal microwave method. At 180ºC/1h.
Poly(vinylidene fluoride) (PVDF) is a thermoplastic with excellent mechanical, optical and thermal properties, and showing resistance to attack of various chemicals [Lovinger 1982]. Formed by repeated units of (-H2C-CF2-)n, has a molecular weight around 105 g / mol. Depending on the means of acquiring or thermal history, PVDF can possess the degree of crystallinity from 45 to 60%, melting temperature (Tm) in the range from 165 to 179ºC and glass transition temperature (Tg) of about -34ºC. Its crystal structure is spherulitic (composed of lamellar crystalline radial). The range of relatively low melting temperature and some properties of the polymer described above ensure easy processing by melting and blending, which means great advantage in large scale production. The PVDF can also be processed by casting that may result in thin films.
Relative to the molecular structure, PVDF is a linear polymer that has permanent electric dipoles approximately perpendicular to the direction of their chains. These dipoles are formed by the electronegativity difference between atoms of hydrogen and fluorine. PVDF can be found in four distinct structural phases α, β, γ and δ.α phase is the most common, this being non-polar usually obtained by cooling molten. The β phase (polar) is very attractive technical-scientific because of its piezoelectric and pyroelectric activity.
The monomer aniline (C6H5NH2) was purchased from Sigma-Aldrich and used in the synthesis after vacuum distillation. For the polymerization of aniline was employed oxidant ammonium persulfate from MERCK. To obtain the PZT particles partially coated with polyaniline, the PZT powder was incorporated into the solution of aniline and 1M cloridric acid under stirring at a temperature around 2ºC for approximately 2 h. The solution was filtered and washed with 0.1M hydrochloric acid and the product was dried in an oven at 50ºC for 3h.
Figure 5 shows the FEG-SEM micrograph of (a) the PZT and (b) PAni-coated PZT particles. It can be seen the lack of smooth of the coated-particle surface.
The PVDF in the form of powder was mixed with pure PZT, the PZT particles coated with PAni and PAni and PZT placed separately. The mixtures were then placed between sheets of Kapton and pressed close to the melting temperature of PVDF. To find the optimum condition for preparation of the composite film the effect of pressing temperature, time and pressure to be taken by the mixtures were studied.The optimum conditions were found to be: temperature of 185ºC for about 1 minute at a pressure of about 7.6 MPa. The thickness of the films was in the range from 100 to 420 μm depending on the ceramic content. The composite films were obtained with different volume fractions of ceramic, which was calculated using the equation below [Marin-Franch 2002]:
where m is the mass and ρ is the density. The subscript c and p are related to ceramic and polymer, respectively. Φc is the volume fraction of ceramic. Figure 6 shows FEG images of the composite sample. It can be seen the homogeneous distribution of the ceramic nanoparticles recovered with PAni.
FEG-SEM images: (a) PZT, (b) PZT recovered with PAni.
FEG-SEM images (profile). (a) particle distribution into matrix e (b) particle recovered with PAni composite with 30 vol% of PZT-PAni.
The protonation degree of polyaniline can be controlled so that the conductivity of the composite, i. e, their permittivity can be changed and facilitate the polarization process [Wei 2007, Wong 2005, Or 2003, Zhou 2005]. Pani can have its conductivity controlled by the pH [Blinova 2008], which means that in more acidic - pH below 4.0 - it begins to undergo the process of doping and its conductivity gradually increased with decreasing pH.
Aluminum electrodes with 1.0 cm of diameter were vacuum evaporated onto both sides of the sample for electrical contact. The composite films were poled with several electric field strengths and times in silicone oil bath with controlled temperature. A TREK high voltage power supply was used for the dc poling process. The dielectric data were taken using an impedance analyzer HP 4192 A in circular samples with 1.5 cm diameter.
An important aspect to note in materials is its electrical response when subjected to an alternating electric field. So it can be observed by measuring the impedance spectroscopy the behavior of dielectric constant versus frequency. Figure 7 shows the behavior of the real relative permittivity ε\' and loss factor ε” which have their highest values with the preparation of PZT-PAni at lower pH values, and in ε" this increase is more significant. This is also an indication that the conductivity σ of the material increases, since it is directly related to the permittivity ε of the material by the relationship [Poon 2004]:
where ω is the angular frequency of an external electric field applied and ε0 is the electric permittivity in vacuum. In systems which contain grains covered with PAni doped partially or completely, ε\' and especially ε\'\' reach high values at lower frequencies, and for these cases the magnitude of ε\'\' is bigger than ε\', indicating high charge mobility, characteristics of the polymeric phase.
The piezoelectric activity of the composite films was studied by measuring the longitudinal piezoelectric coefficient d33. The samples were poled in different poling conditions, changing parameters such as poling field, poling temperature and poling time. The best conditions of poling the sample were found as it can be seen in Figure 8 (a), (b) and (c).
Dielectric Constant as a function of frequency for PZT e PZT-PAni with different protonation degree.
Longitudinal piezoelectric coefficient d33 :(a) As a function of poling time; (b) as a function of poling temperature and (c) as a function of applied electric field.
The longitudinal piezoelectric coefficient d33 was measured with a Pennebaker Model 8000 Piezo d33 Tester, (American Piezo Ceramics Inc) coupled with a multimeter 34401A, (Hewlett Packard). To avoid problems related to non-uniformity of the composites, the measurement is made at least in 10 different points for each sample and the average of these points is taken as the coefficient d33. Table 1 shows the values of d33 piezo constant for some composite materials with respective volume fraction of ceramic. There is a clear indication that even for lower ceramic content, the piezoelectric activity of the PZT-PAni/PVDF composite, i.e., composite with ceramic particle covered with a conducting polymer phase is comparable with other composites with higher ceramic phase and much better than the PZT/PVC composite with the same ceramic volume fraction.
By means of thermally stimulated depolarization current (TSDC) is possible to obtain the pyroelectric coefficient p(T). However it is necessary to clean up this curve, or leave it free from unwanted effects, such as the fluctuation of space charges injected during the polarization, since the interest is only the dipolar contribution, because it will remain even after heating the sample, if the provided temperature does not exceed the bias.
Figure 9 shows that for the first heating the depolarization current is greater than for the next heat, in which current tends to stabilize. This stabilized curve is the pyroelectric current, i.e., that due to dipolar relaxation.
Composites | Volumetric fraction of ceramic (%) | d33 (pC/N) |
PSTM/PEKK [PELAIZ-BARRANCO 2005] | 50 | 21 |
PTCa/PEKK [PELAIZ-BARRANCO 2005] | 50 | 28 |
PZT/PU with 1% of graphite (SAKAMOTO 2001) | 49 | 13 |
PZT/PVC [LIU 2006] | 30 | 6 |
PZT/PVC [LIU 2006] | 50 | 17 |
PZT/PVDF with 10% of PAni [RENXIN 2006] | 50 | 28 |
PZT-PAni/PVDF redoped in pH=3.7 | 30 | 15-20* |
D33 piezo constant for some composite materials.
Depolarization current for PZT-PAni/PVDF 30/70 vol% with PAni redoped in pH=3.7.
The pyroelectric coefficient p(T) can be obtained using the equation below:
where P is the polarization, A the area of the electrode, Ip the pyroelectric current and dT/dt the heating rate. Figure 10 shows the pyroelectric coefficient as a function of the temperature for different composites with 30 vol.% of PZT.
Pyroelectric coefficient of composite with 30 vol.% of PZT-PAni.
It can be observed low values of pyroelectric coefficient for composites PZT-PAni/PVDF fully doped (Δ). This effect is expected, since its polarization is hindered by the high conductivity of the films. For the composites PZT/PVDF and PZT-PAni/PVDF dedoped in the range of 0 to 40oC the behavior of the pyroelectric coefficients are similar, while the composite PZT-PAni/PVDF redoped (pH 3.7) has larger values. At temperatures above 40ºC, the composite with PAni dedoped has little increase in pyroelectric coefficient with increasing temperature, while the composites PZT/PVDF and PZT-PAni/PVDF redoped having similar behavior, suffer a sharp increase. Table 2 shows the value of pyroelectric coefficient at room temperature for some composite materials. The composite with ceramic particle partially covered with PAni after suitable protonation degree display pyroelectric coefficient comparable with composite samples described in literature, which uses high ceramic volume fraction.
Composite | Volumetric fraction of ceramic (%) | p(T) (μC.m-2.oC-1) |
PZT/Epoxy [DAS-GUPTA 1999] | 40 | 40 |
BaTiO3/rubber [DAS-GUPTA 1999] | 30 | 60 |
TGS/PVDF [DAS-GUPTA 1999] | 80 | 90 |
PT/PVDF [DAS-GUPTA 1999] | 62 | 130 |
PZT/PVDF [DAS-GUPTA 1999] | 50 | 10 |
PTCa/P(VDF-TrFE) [DAS-GUPTA 1999] | 65 | 130 |
PZT-PAni/PVDF redoped in pH=3.7 | 30 | 70 |
Pyroelectric coefficient for some composite at room temperature
For material to be used as a sensor, the relationship between output voltage and input power should be linear, i.e., the responsivity should remain constant. And regarding the magnitude of responsivity, it may indicate the quality of the sensor, i.e. the larger the magnitude, more input signal is being converted into output signal.
Four samples: two of PZT/PVDF 30/70 vol%, one previously polarized with a electric field of 10 MV/m for 1 hour and another with a field of 5 MV/m for 15 minutes, a PZT/PVDF 50/50 vol% polarized with 10 MV/m for 1 hour, and one of PAni with 30/70 vol% PZT-PAni/PVDF redoped at pH 3.7 and polarized with 5 MV/m for 15 minutes were compared. Figure 11 illustrates the behavior of the output voltage as a function of frequency and input power.
A close analysis of the results allows observing that the composite with polyaniline was superior in all respects in comparison to the other composites. Although the PZT/PVDF 50/50 vol% has close values of output voltage (Figure 11), the electric field and the time spent to polarize it were high. Furthermore, the ferroelectric ceramics content is higher. Without conducting phase in the composite the poling conditions have to be actually higher for the best properties of electroactivity. It can easily be observed when comparing the two composites PZT/PVDF 30/70 in volume. The composite polarized with higher electric field and spending more time showed higher output voltage. Yet comparing the composites with 30% load PZT or PZT-PAni, the latest presents better results.
In photopyroelectricity the upper face of the sample is painted with black ink to optimize the energy absorption. Since the sample works as a thermal transducer, absorbed modulated radiation increases the temperature of the sample and the heat is transformed into an electrical signal generated by the potential difference between the two faces of the sample. According to Mandelis and Zver [Mandelis 1985] the photopyroelectric voltage (V(ω)) can be written, for the optically opaque and thermally thick pyroelectric sample, as:
where :
is the amplitude, η is quantum efficiency, I0 is the light intensity, F is the thermal coefficient which depends on the thermal parameters of the sample, ω is the angular frequency of light modulation, αs is the thermal diffusivity of the sample, Ls the thickness and φ is the phase of the photopyroelectric signal. In the amplitude p is the pyroelectric coefficient, ε0 the vacuum permittivity and κ the relative permittivity.
The concept of energy harvesting must be related to capture the ambient energy and convert it into usable electrical energy without environment attack i.e., a clean electric energy. Although there are a number of sources of harvestable ambient energy, such as solar energy and energy from wind [Schwede 2010, Chang 2002], piezoelectric materials are very interesting due to their ability to convert applied strain energy into usable electric energy. Some countries are working hard on it and Israel, for example, using piezoelectric plates under the track, can obtain power enough to provide electricity to a medium house.
a) output voltage x frequency; (b) output voltage as a function of incident Power for different composites.
The energy recovery from the wasted energy used or not was a topic of discussion for a long time. Unused energy exists in various forms, such as vibration, water, wind, sun, heat, cold, human and vehicle movement, and shock waves. In today\'s world, there is a strong technological breakthrough in the way of life. More and more people are carrying portable electronic devices. These devices have and enable incredible power and versatility in communication and problem-solving. But as the technologies of portable computers and microcontrollers have grown tremendously, the battery energy and the storage technology did not follow them. New technology allows these portable devices become ever smaller, but the sizes of cells or batteries are still the same and the limited operating life is a great problem.
An alternative to the batteries and cells is the implementation of a method to obtain energy surrounding devices that could power supply them. Piezoelectric materials can be used to convert mechanical energy into electrical energy that can be used to power other devices. Energy harvesting using piezoelectric materials have attracted many attention of the researchers around the world. Many works have been published in this area [Koyama 2009, Umeda 1997, Sodano 2004, Zheng 2009, Wang 2010, Anton 2007] and the focus is to find a material which gives power enough to allow its use commercially.
Composite | Thickness (µm) | Piezoelectric Coefficient d33 (pC/N) |
A | 800 | 28 |
B | 600 | 28 |
C | 600 | 20 |
D | 700 | 10 |
Characteristic of the composite samples
Composite sample 50 vol% (grey) with cooper foil for electric contact.
The cantilever beam structure is one commum setup for energy harvesting. It uses PZT thin film to transforme the mechanical vibration into electrical energy. In the present work composite films were put under a track which will simulates car traffic or people movement. Within this context, four square composite samples with 4.5 cm2 were poled with suitable electric field and copper foil (1 mm thick) was glued for electrical contact as show in Figure 12. Table 3 shows the longitudinal d33 piezoelectric coefficient for each one.
To evaluate the power generated by these samples, they were pressed by the blue car continuosly as shown in Figure 13. The weight and the frequency of the blue car which will impact the composite samples can be controlled and fixed during the experiment. The output voltage provided by the piezoelectric composite can be measured with an oscilloscope.
System used to simulate the vehicle traffic or people walking.
A track is project and constructed with two parts. A bottom steel base with electrical tape on its top, fixed to a press device plane. A top made of aluminum with the bottom with duct tape, and attached to external screws that make this part of mobile resource, since the composite is between bottoms and top part of the track it receives the impact of the track above it. The composites were used as transducer individually, in series and in parallel. Then they were connected directly (open circuit) to acquire the waveforms from the digital oscilloscope. Further, the composites were connected in circuit (closed circuit) with the oscilloscope at the entrance acquiring waveforms again. Finally, voltages were measured at the capacitors for every minute during 10 minutes. Acquisition board was used to get the electrical signal provided by the composite. This board consists of a retifier circuit AC/DC and a output capacitor.
The experiments starts using a force of 200 kgf, to stroke the composites with a frequency of 3.0 Hz, and a capacitor of 3300 μF. The open circuit (directly on the composites) and the closed circuit measurements for each composite, and combined composites in parallel (//) which are showed in Figure 14.
Composites A///B//C//D voltage measurement with open circuit (right)and closed circuit (left).
Energy harvesting analysis. // means parallel connection; + represents a series connection.
Experimental results show that an open circuit output voltage of 17.0 Vpp are generated while in closed circuit the peak to peak voltage generated is 2.13 V because of the impedance of the capacitor.
Figure 15 shows the energy analysis of the experiments for different configurations of the composite films. It can be seen the increasing energy supplied when the composite films are connected in parallel. The useful energy, after 10 min, by four composite films is about ten times higher than the energy generated by one composite film. The values of energy in Figure 15 were calculated from the measurement of the output voltage against time, using the following relation:
where U is the available energy and V is the voltage measured on the capacitor. The voltage was measured during the charge of the capacitor due to the deformation of the composite films by the applied stress.
Composite films made of PZT ceramic immersed in PVDF polymer matrix were obtained with 0-3 connectivity. The method of synthesis can provide different structure of the ceramic and also can provide ceramic particles with different size distribution which are important parameters for the electroactive properties of the sample. The inclusion of a semiconductor phase, separately or coating the ceramic particles improve the poling process of the composite, avoiding timing consuming and high applied electric field to polarize the ferroelectric ceramic particles immerse into the polymer matrix. The advantages of recovered particles is the better control of the homogeneity of the particle distribution avoiding percolation of conductive particles that may form a continuous path which not allow the poling process.
Using small amount of ceramic (30 vol%) the composite was used as infrared detector, indicating the possibility of its use as intruder detector or fire alarm. Using the right protonation (doping) degree of the PAni, the composite display piezo and pyroelectric coefficients high as many composite materials with higher ceramic content even when poled with lower electric field and shorter poling time. The study of energy harvesting simulating people walking or vehicle traffic showed low power generated by each small composite sample (4.5 cm2 area) but the association of four samples enhanced the converted electrical energy from the energy wasted during vehicle traffic. These preliminary results show that the composite material deserves to be deeply studied as alternative material to obtain clean energy.
This work has financial support from the Brazilian Agencies: Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP and Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq through the Instituto Nacional de Ciência e Tecnologia de Materiais em Nanotecnologia – INCTMN.
Material that has space or cavity inside or not solid within is called a hollow material. The surface of hollow material has more area than regular materials. For example, a cube-shaped material (Figure 1a) has six surface areas, but if its shape changes to a hollow cubic structure (Figure 1b), so that it has eight surface areas. For instance, the surface area of the hollow cubic unit cell is 1.333 times the surface area of a regular cube per unit cell. The difference in the surface area depends on the geometric shape of the material if it is cylindrical or tubular, the difference in a surface area becomes much large.
The structure area of regular and hollow cubic shapes.
In nature, some inorganic compounds have hollow structures such as zeolites even though the size of the hollow has not in the range of the nano category. However, the utilization of the hollow zeolite structures turned out to be quite a lot, for example, as function as molecular sieves [1], absorbents [1], and selective catalysts [2]. Although the application categories that can be covered come in microns.
In line with the development of nano and hollow materials, the manufacture of nano hollow single-crystal zeolites was carried out and shown in Figure 2 below.
A flowchart and the example of Zeolite nano hollow formation [3, 4].
One of the applications that can be covered is the nano-sized material, such as zeolite, one of which is the molecular sieve where the application of purification or separation of pollutant particles from plastic contaminated water with nano-microns or microbes was able to be done [5].
Based on the study of specific surface area, load capacity, material transfer as well as storage, the size of the cavity makes hollow materials have extraordinary advantages in their characteristics. Having driven by these unique characteristics, the research groups eager to explore the more possible applications such as catalysis, photocatalysis, drug delivery, solar cells, supercapacitors, lithium-ion batteries, electromagnetic wave absorption, and sensors. The challenge faced in producing hollow materials at this time is to synthesize nano hollow materials which have a series of controlled structures in terms of composition and geometric configuration so that their applicative development is still constrained. However, the progress regarding the ability to manipulate both structure and morphology of nano hollow scale solid materials will have greater control over the local chemical environment [6, 7, 8, 9].
Furthermore, the simple method used in the manufacture of nano hollow materials emphasizes the preparation process, economic review, and environmental friendliness for each of the chemicals used. This simple method is possible to produce nano hallow materials of various shapes such as nano hollow spheres (NHS), nano hollow cubes (NHC), nano hollow squared tubes (NHST), and related fibers. The applications described are the catalytic utilization of carbon dioxide into alcohol compounds, degradation of dyes, and the conversion of nano-cellulose to alcoholic sugars by photocatalysis.
Hollow materials, in general, can be prepared using the Kirkendall effect and Ostwald ripening based on events, as well as the templating method (hard, soft, or one-pot/self-templating and free) based on the use of templates. In more detail, it described below:
Kirkendall effect, a vacuum ordering occurs due to a change in the rate of diffusion between two or more components diffusing simultaneously. The process of different diffusion movements was proven experimentally by Smigelkas and Kirkendall [10] in 1947 that atomic diffusion occurs through the exchange of vacancies rather than by the direct replace of atoms. One example of this method is the preparation of metal oxides that can change the morphology of nanowires to nanotubes [11]. The example of nanowire formation based on Kirkendall effect is shown in Figure 3.
The schematic formation of Hollow Cu nanowires based on Kirkendall effect during the thermal oxidation process in air at 300°C [12].
The mechanism explaining the formation of a cavity or hollow material in the inner direction could be described as follows: cations will flow rapidly outward through the oxide layer and flow inward from the void as a counterweight to the metal oxide interfacial void. Then, the direction of flow of the material is equalized by the direction of flow of the void through condensation into the pore or eliminating the crystalline defects. The direction of material flow can also result from the phenomena of diffusion and reaction pairs at the gas/solid or liquid/solid interfaces, the formation of deformations and vacancies, or both during the growth of metal oxide or sulfide layers [13, 14]. It should be remembered that the hollows produced in the metal-metal diffusion pair or near the metal oxide interfaces of an oxide growth do not produce mono-spheres in regular directions but form a very heterogeneous molecular collection.
Ostwald Ripening is a phenomenon that is observed in solid solutions or liquid soles and explains changes in the structure of inhomogeneity with time, for example, small crystals or sol particles dissolving and being deposited back into crystals or larger sol particles. This phenomenon was first described by Wilhelm Ostwald in 1896 [15, 16] and is commonly found in oil-in-water [17] emulsions when flocculation is found in water-in-oil [18] emulsions. Schematically the w/o and o/w emulsions are presented below in Figure 4a.
Schematic of both w/o and o/w emulsion and hollow particles formation (a) using oleyamine micelles [19], and the growth of solid carbon sphere (b) based on Ostwald repining mechanism [23].
Ostwald ripening mechanism is well-known through several growth methods, such as island formation [20], layer by layer formation [21], and the mixed layers and islands formation [22] as illustrated in a solidified growth of carbon sphere in Figure 4b.
The emulsion produced in the w/o or o/w system is affected by various factors such as pressure (Laplace and osmotic), the concentration of the dispersed phase, the concentration of surfactants, and the additives used. Furthermore, the emulsifiers or surfactants used are generally biopolymers such as various proteins (whey protein isolate (WPI), β-lactoglobulin, casein, soy protein isolate (SPI), and pea protein [24], polysaccharides such as xanthan, Arabic gum, modified starch, carrageenan, pectin, and modified celluloses frequently utilized to stabilize emulsions, especially O / W and W/O/W double emulsions [25].
The Smoluchowski process is a process to produce nano hollow complex materials in an “integrative” nature from colloidal particles. An example of this preparation was the manufacture of titanium oxide, TiO2, and the yield observed by a high-resolution TEM [26]. The HRTEM TiO2 micrograph showed that the tiny nanocrystallites stuck to each other in the aggregated end product while keeping the overall orientation unchanged. An example of the formation of particles based on the Smoluchowski mechanism is presented in Figure 5 below.
An example of a particle formation mechanism based on the Smoluchowski process with an emphasis on agglomeration and aggregation [27].
These methods can effectively control the morphology, particle size, and structure during the nanomaterial manufacturing process. In general, these methods consist of two types/categories, namely: hard methods and soft (or one-pot or self) templates according to different structures. The methods of templates in their preparation are insensitive, easy to operate, and practice.
In principle, this method is for the preparation of one-dimensional hollow materials. Materials used as hard-templates are polymer microspheres, porous membranes, plastic foam, ion exchange resins, carbon fiber, and anodic aluminum oxide (AAO) [28, 29]. Because the templates and the resulting target products have a unique structure and influence the particle size range, they play an important role in many areas of application. Furthermore, after the desired target is obtained so that a template used is moved/separated or modified.
One example of using the hard template method is making the ordered mesoporous CeO2 prepared via a hard-template method using SBA-15 as a structure-directing agent. Leaching with NaOH and thermal treatment at 500°C enabled the removal of the inorganic template, thus resulting in the formation of long-range ordered CeO2. Nevertheless, small amounts of silica were present in the final oxides. The resulting CeO2 samples were used as supports for Au nanoparticles as shown in Figure 6 below.
Schematic pathways of Au doped CeO using hard template method [30].
The soft templating or the endotemplate method refers to supramolecular entities like self-assembled arrangements of structure-directing molecules such as surfactants, leading to mesopores up to 30 nm [31, 32].
In the soft template method as shown schematically in Figure 7, compounds that function as templates are organic compounds whose molecules form aggregates through inter-molecular or intra-molecular interactions such as hydrogen bonds, chemical bonds, and electrostatic forces. The metal cations as the target as the hollow material are deposited on the surface or in the inside of the aggregate. The process of placing metal cations in the aggregate carried out using electrochemical methods, precipitation, and other synthesis/preparation methods to form metal oxide or composite materials of various shapes and sizes. Organic compounds that commonly function as templates are surfactants, polymers, biopolymers, supramolecules, and inorganic compounds. Based on the type of compound that can act as a soft template, it is possible to develop nanomaterial synthesis because this method has advantages such as simplicity of the process, repetition of the process with good results, and does not require removal of targets from the aggregates [34, 35, 36, 37, 38].
Soft template pathways to produce hollow material [33].
One example of a soft template method to generate ABO3/AB2O4 nano hollow is spinel compounds of both Fe3O4 and CoFe2O4, respectively [39, 40]. Magnetite hollow spheres, Fe3O4 were prepared using a soft/free template with the solvothermal method described by Chen et al. [39] as follows: 13 g FeCl3.6H2O was dissolved in 350 mL of ethylene glycol and diethylene glycol. Subsequently, 2 g NaAc, 2 g polyvinyl pyrrolidone (PVP), and sodium citrate (Na3Cit) were added to the solution’s ultrasonic processing. After an hour, the solution was sealed in a 400 mL Teflon-lined stainless-steel autoclave. The autoclave was heated to 210°C for 12 h and then cooled to room temperature naturally. The black products were collected by magnetic decantation and centrifugation, followed by repeated washing with deionized water and ethanol. The final products were dried in a vacuum oven at 50 C for 12 h. Another procedure with the same steps and only differs in the number of materials used and the washing process of the solution which turned black was washed with alcohol several times and dried at 60°C overnight. The diameter size of the product magnetite hollow spheres can be adjusted by changing the concentration of the added PVP [41]. Preparation of Fe3O4 using urea and PVP as a binder for Fen+ cations gives nano hollow spheres as shown in the following figure.
Mandal et al. [41] have synthesized of hollow Fe3O4 particles via a one-step solvothermal approach for microwave absorption materials: effect of reactant concentration, reaction temperature, and reaction time as shown in Figure 8j below.
The TEM results of NHS Fe3O4 (j), NHS Fe3O4 (c), and NHS NiFe2O4 spinel (a) using the solvothermal method.
Then, another method of a template-free preparation of Fe3O4 nano hollow spheres has prepared by researcher Shi et al., 2019 [42] using the following procedure, hydrated ferrous chlorine salt (FeCl3.6H2O, 1.084 g) was dissolved in 80 mL of deionized water under rigorous and constant stirring for 10 minutes. Then added Na-citrate salt (2.352 g), PAM (0.8 g), and urea (0.72 g) while stirring vigorously for 30 minutes. The mixture was then transferred to Teflon and tightly closed before being placed into the autoclave and heated at 200°C and held at the temperature for 24 hours. Then cooled naturally with air. The result of a black precipitate Fe3O4 was washed with water and ethanol, separated by magnetic attraction, and finally dried at 50°C for 12 hours in an oven. An example of the results obtained by the research group of Shi et al. [42] is shown in Figure 8c below. Furthermore, NiFe2O4 nano hollow spinel preparation used a template-free method, namely the solvothermal process was carried out using oleyl amine capping agent. Hydrated chlorine salts of nickel (NiCl2.6H2O) and iron (FeCl3.6H2O) respectively mixed with urea with a 1:2 molar ratio. The solvent uses a mixture of ethylene glycol and ethanol with a ratio of 2:1. After all these substances put into a glass chemical 100 mL, added as much as 1 mL while stirring. After 30 minutes stir, the solution becomes transparent and homogeneous, then put the Teflon which is tightly closed and put into the autoclave steel and heated at 200°C for 24 hours. The product was then passed with ethanol and collected by separation and heated at 60°C for 30 minutes. Product samples were analyzed by TEM with a result in the following Figure 8a below [43].
The simple method for producing hollow nanomaterials in question is in terms of the use of chemicals to produce nano hollow materials and environmentally friendly products. In the nano hollow material preparation, water and pectin or egg white solution is used as media. The procedure to obtain the nano hollow material is explained in brief here. The procedure to obtain the nano hollow material is explained in brief here. A stoichiometric amount of Ni (II) nitrate hydrates, ammonium vanadates, and Fe (III) nitrate hydrates were dissolved in distilled water, having compositions of Ni1-xVxFe2O4 under magnetic stirring for 1 h, respectively, followed by mixing each solution to make the final solution weight ratio between nitrates to pectin is 3:2. Adjust the pH = 11 in the above solution by an addition of ammonia, and heat it at 80 °C with continuous stirring to form a viscous gel. Then, dried the gel using the freeze dryer for 7 h to form the precursors’ networks and calcined at 600 °C for 3 h. The results are shown in Figure 9 below.
TEM results of hollow material Ni1-xFe2O4 (where x = 0.1 – 0.5) were prepared using sol-gel method [44].
Figure 9b and c clearly show the formation of nano hollow cube (NHC) from Ni1-xVxFe2O4 (x= 0.1 – 0.5) spinel. Furthermore, in Figure 9a, if you notice there are the cubic hollow aggregate and also a squared nano hollow tube (SNHT).
Then, in Figure 10a the micrograph shows that squared hollow pipes, hollow cube, and hollow tubes formed. In Figure 10b, you can see the nano hollow cubes (NHC) and micron sizes and nano spherical tubes (NST). Whereas in Figure 10c, you can see the interconnected pillars of micron and nano hollow cube sizes.
TEM results of hollow nanomaterial LaCr1-xMoxO3 (x = 0.01-0.05) were prepared using sol-gel method [45].
In the preparation of both pure LaCrO3 and modified LaCrO3 by the sol-gel method [46] gave SEM micrograph results shown in Figure 11a and b. It seemed that the shapes of material are varied that are nano hollow cubes (NHC), nano hollow tubes (NHT), and the blended shapes presented in Figure 11a. In Figure 11b, the interconnected microfiber structure and the hollow micro material formed. Meanwhile, Figure 11c shows the homogeneous nanoscale grains of hollow NiFe2-xCoxO4 spinels prepared using the egg white solution.
TEM and SEM results of LaCrO3 and LaCr1-xVxO3 materials prepared using pectin and egg-white solution [46, 47].
After the preparation of all the catalysts is done, it is used respectively for both thermic catalytic reactions and photocatalysis. The compounds that are the research targets are CO2, NOx, dyestuffs, and cellulose. The selection of the four targets intensely focused on the impact factor and the benefits that can gain.
Carbon dioxide (CO2) and NOx gas emitted from the use of fossil energy sources containing the main elements H, C, and O as well as other minor elements N, and S. The overall reaction can be described below:
The greater use of energy sources for activities, causing the emission of CO2, NOx, and SOx gases to increase [48]. Continuous emissions without treatment will cause acid rain and the greenhouse effect. This emission will stimulate global warming and even higher. One way to participate in the handling of COx and NOx wastes is through its utilization. One of the handling methods is using the nanocatalysts to handle thermally and photonically by converting the organic wastes (solid, liquid, and gaseous) such as cellulose, dyes, and COx and NOx pollutant into products that are economically valuable and environmentally friendly as described below.
Catalytic reaction - thermic is a catalytic reaction that takes place with the help of thermal energy. These catalytic reactions control more than 90% of processes in the chemical industry [49]. In thermic catalytic research, the study is the hydrogenation reaction of CO2 and the decomposition of NOx exhaust gases. The research results of this reaction are briefly presented below.
The CO2 hydrogenation reaction was carried out using the perovskite LaCrO3, and spinel Ni1-xFe2MxO4 catalysts (M = Cu, Co, and Zn) with the reactor scheme shown in Figure 12a below.
Lab scale reactor (a) of CO2 hydrogenation reaction [50], results of rapid test (b) for alcohol product [51], and chromatogram results (c) of the CO2 hydrogenation reaction [52].
The catalytic reaction takes place at a temperature of 100 to 400°C with a composition of CO2/H2 = 1/3 in the gas flow. Examples of reaction results using rapid tests and several quantitative analyzes are shown in Figure 12b and Figure 12c, respectively.
The decomposition reaction of NO2 and NO or NOx is a type of reaction that uses a selective catalyst reduction (Selective Catalyst Reduction). In general, the catalyst (SCR) is used to reduce NOx, COx, and SOx emissions with the ability to reduce more than 90% of emission gases from boilers [53], power stations [54], and motorized vehicles [55] to be applicable. The results of the deNOx reaction research conducted by our team are presented in Figure 13 below.
Decomposition of NOx using catalysts (a). NiO/LaCrO3 [56], and (b). Fe/Zeolite [57].
The NO2 conversion results obtained using NiO/LaCrO3 nanocatalyst (Figure 13a) is relatively better than those obtained using Fe/Zeolite Catalyst (Figure 13b) at the same reactant conditions and reaction temperature ranges.
Photocatalytic reactions are catalytic reactions that take place with the help of photon energy, so they are often called catalytic reactions - photonics. This reaction has been going on for a long time while the development is taking quite a while. It was a German chemist, Dr. Alexander Eibner who is firstly doing research in photocatalysis by irradiated ZnO in a concentrated Prussian blue solution and the solution became clear [58, 59]. Then, it has grown rapidly from 1964 until now, for various chemical reactions such as the production of hydrogen gas [60], and to photosynthetic-mimic reactions [61, 62]. Furthermore, our research related to photocatalysis is described below.
The textile and other industries usually use dyes in their products to make them look attractive. However, the remaining dyes have gone through a waste treatment process, especially in large factories but not necessarily in medium and small factories. As usual, the dye waste is thrown away into water bodies such as rivers and seas. Since the dye waste is very toxic and difficult to degrade naturally, so it can disturb the aquatic biota. One of the dyes that difficult to degrade and widely used in the small batik textile industry (home industry) is methylene golden yellow. Our research team also studied the decomposition of these dye compounds using NiFe2O4 nanocatalysts stimulated by sunlight and UV rays. An example of the result of the decomposition reaction is shown in Figure 14 below [44].
RGY decomposition using NiFe2O4 nano hollow catalyst under the irradiated light of: (a) Sun, and (b) UV.
In the decomposition reaction of the remazol golden yellow dye under solar and UV irradiation, as shown in Figure 14, the difference in activity occurs because of sunlight contains UV rays and the nanocatalysts are active for both rays [63].
This type of reaction was studied considering the abundant availability of residual raw materials for agri-industrial products in Lampung Province and various conversion results such as glucose, xylitol, mannitol, sorbitol to fuel alcohol. The research team\'s target in the conversion of cellulose is a sugar alcohol, and the reaction takes place at room temperature and is environmentally friendly. The results achieved are shown in Figure 15 below.
Results of nano cellulose conversion (a) and the chromatogram of alcohol sugar (b) using HPLC [64].
The brief description of nano hollow materials presented in this paper is basically to provide an overview of the potential for nano hollow materials in managing reactions with results that are environmentally friendly and have economic value. Furthermore, nano hollow materials can be resulted using simple methods in terms of the chemicals used, economics point of view, and environmental considerations such as pectin, egg white, and monosaccharides in water media.
The author gratefully acknowledge both the Indonesian Government through the Directorate Research, Ministry of Research and Higher Education on the contract number 179/SP2H/LT/ADM/DRPM/2020 and the Research Institution and Community services of the University of Lampung for supporting this book chapter.
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