Effect of controlled conductivity on thermal sensing property of 0-3 pyroelectric composite
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2013-02-01
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Composite films made of lead zirconate titanate ceramic particles coated with polyaniline and poly(vinylidene fluoride) - PZT-PAni/PVDF were produced by hot pressing the powder mixtures in the desired ceramic volume fraction. The ceramic particles were coated during the polyaniline synthesis and the conductivity of the conductor polymer was controlled by different degrees of protonation. Composites were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), ac and dc electrical measurements, the longitudinal d33 piezo coefficient and the photopyroelectric response. Results showed that the presence of PAni increased the dielectric permittivity of the composite and allowed better efficiency in the poling process, which increased the piezo- and pyroelectric activities of the composite film and reduced both the poling time and the poling electric field. The thermal sensing of the material was also analyzed, showing that this composite can be used as pyroelectric sensor. © 2013 IOP Publishing Ltd.
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Ceramic particle, Ceramic volume fraction, DC electrical, Dielectric permittivities, Lead zirconate titanate ceramics, Poling electric fields, Poling process, Poly(vinylidene fluoride), Powder mixtures, Pyroelectric sensors, Thermal sensing, Electric fields, Fourier transform infrared spectroscopy, Hot pressing, Permittivity, Polyaniline, Scanning electron microscopy, Semiconducting lead compounds, Synthesis (chemical), Volume fraction, Composite films
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Inglês
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Smart Materials and Structures, v. 22, n. 2, 2013.