Effect of controlled conductivity on thermal sensing property of 0-3 pyroelectric composite

• Published in: Smart materials and structures 2013-02, Vol.22 (2), p.25015-1-7
• Main Authors: de Campos Fuzari Jr, Gilberto, Orlandi, Marcelo Ornaghi, Longo, Elson, Melo, Washington Luiz de Barros, Sakamoto, Walter Katsumi
• Format: Article
• Language: English
• Subjects: Ceramic coatings; Ceramic powders; Ceramics; Deoxidizing; Detection; Exact sciences and technology; General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Particulate composites; Physics; Polyanilines; Scanning electron microscopy; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
• ISSN: 0964-1726; 1361-665X
• DOI: 10.1088/0964-1726/22/2/025015

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.