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    Enhancement of ferroelectricity in Langmuir–Blodgett multilayer films of weak-polar organic molecules

    Year: 2006

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volumes 284-285, 15 August 2006, Pages 419-423, 20111221

    Authors: Shuhong Lia, Shihong Mab, Bo Lib, Jinglan Sunc, Genshui Wangc, Xiangjian Mengc, Junhao Chuc and Wencheng Wang

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

    Ferroelectricity in Langmuir–Blodgett (LB) films (Z-type and alternated Y-type) of nitrogencrown (NC) and arachidic acid (AA) was investigated by electric polarization measurements and small angle X-ray diffraction (SAXD). For Z-type AA LB multilayer and the AA LB films incorporating barium ions, as well as for Z-type NC LB multilayer and the Y-type NC/AA alternating LB films, hysteresis loops of the samples were observed and confirmed existence of the remnant polarizations in the LB films. Their corresponding remnant polarizations were found to be 15, 180, 450 and 9400 μC m−2, respectively. Therefore, the maximum ratios of remnant polarizations up to 620 (9400/15)-folds were obtained from NC/AA alternating LB films. The enhancement of ferroelectricity in NC/AA alternating LB films was observed for the first time. It was demonstrated that the enhancement of ferroelectricity in the LB films could be created by incorporation of barium ions into the LB film structures and strong interaction due to electron clouds redistribution largely originated from the compact insertion configuration of AA between two chains of NC molecules in interleaving films.