Polarization of Hemicyanine Langmuir-Blodgett Films

The polarization dependence of electric field for hemicyanine layers deposited by the Langmuir-Blodgett (LB) technique has been measured. The experimental results show that ferroelectricity exists not only in thick films (200nm) but also in thinner films (3Ohm), and the remnant polarization is related to film thickness. In order to interpret the measured results, a planar rotor model was introduced, and a relation between polarization and film thickness was obtained by perturbation theory. The theory fitting agrees with experimental results well. It is confirmed that ferroelectricity in organic molecular LB films mainly arose from altering of molecular orientation.     

有机功能超薄膜铁电性研究进展

扼要叙述了有机铁电LB膜的制备方法，着重介绍了近几年来有机LB膜的铁电性应用与研究的进展．