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    Pyroelectric figure of merit in alternating hemicyanine/NC Langmuir–Blodgett films incorporating barium ions

    Year: 2006

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volumes 284-285, 15 August 2006, Pages 74-77, 20111221

    Authors: Shihong Ma, Shuhong Li, Wencheng Wang, Genshui Wang, Jinglan Sun, Xiangjian Meng and Junhao Chu

    Organizations: Department of Physics, State Key Lab of Advanced Photonic Materials and Devices, Fudan University, Shanghai 200433, China, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China, National Laboratory for Infrared Physics, Chinese Academy of Sciences, Shanghai 200083, China

    Pyroelectric properties in alternating hemicyanine (DAEP)/nitrogencrown (NC) Langmuir–Blodgett (LB) films and effects of incorporating barium cations on pyroelectric behaviors have been investigated. Its pyroelectric coefficient measured is found to be 58 μC m−2 K−1at 300 K. Their dielectric properties have been measured and used to determine the figures of merit in thermal devices. Relative permittivity (var epsilonr) and dielectric loss values (tan δ) of pyroelectric films (in the range of 1–100 KHz) are found to be 2.34–1.96 and 0.08–0.04, respectively. These data give a maximum pyroelectric figure of merit of 150 μC m−2 K−1 in the alternating LB films incorporating barium ions. The effects of different deposition on pyroelectric properties are also discussed in this paper.