12 February 2009 Dielectric and pyroelectric properties of LiTaO3:P(VDF-TrFE) composite films
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Abstract
Pyroelectric infrared radiation detectors are one of kind thermal sensors, operating at ambient temperature, unlike semiconductor detectors, which require cooling. They also have a uniform spectral response in a wide range of wavelengths, including the main band of infrared transmission of the earth's atmosphere. Recently, 0-3 composites consisting of ferroelectric ceramic particles dispersed in a ferroelectric polymer have stimulated interest due to their good mechanical flexibility and strength, and excellent piezoelectric and pyroelectric properties. Lithium tantalite [(LiTaO3), LT] ceramic particles have been incorporated into a polyvinylidene fluoride-trifluoroethylene [P(VDF-TrFE) 70/30 mol%] copolymer matrix to form composite films. The films were prepared using solvent casting method with the LT powder homogeneously dispersed in the P(VDF-TrFE) copolymer matrix with various volume fractions. Electrical properties such as the dielectric constant, dielectric loss, and pyroelectric coefficient have been measured as a function of temperature as well as frequency. In addition, materials' figures-of-merit have also been calculated to assess their use in infrared detectors. The results show that the fabricated lithium tantalite: polyvinylidene fluoride-trifluoroethylene composite films have a good potential for uncooled infrared sensor applications operating at moderate temperatures.
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A. K. Batra, John Corda, Padmaja Guggilla, M. D. Aggarwal, M. E. Edwards, "Dielectric and pyroelectric properties of LiTaO3:P(VDF-TrFE) composite films", Proc. SPIE 7213, Organic Photonic Materials and Devices XI, 721313 (12 February 2009); doi: 10.1117/12.807948; https://doi.org/10.1117/12.807948
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