Pyroelectricity in alternating ultrathin organized molecular films incorporating barium ions

Pyroelectric properties in alternating DAEP/NC Langmuir-Blodgett (LB) films and effects of incorporating the barium cations on pyroelectric behaviors have been investigated. Its pyroelectric coefficient measured is found to be 58μC m -2 K -1 at 300K. The dielectric properties have been measured and used to determine the figures of merit in thermal devices. Relative permittivity e r and dielectric loss values tanδ of pyroelectric films (in the range of 1KHz - 100KHz) are 2.34~1.96 and 0.08~0.04, respectively. These data give a maximum pyroelectric figure of merit of 150μC 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. It is indicated that the alternating LB films is promising in the field of pyroelectricity and pyroelectric infrared detector.