Chinese Optics Letters, 2005, 3 (0s): 68, Published Online: Mar. 5, 2007
Pyroelectric activity in polar hemicyanine Langmuir-Blodgett multilayer films
190.4710 Optical nonlinearities in organic materials 300.6340 Spectroscopy, infrared 190.2620 Frequency conversion 040.3060 Infrared 160.1890 Detector materials
Abstract
The Langmuir-Blodgett (LB) films of hemicyanine dyes were prepared by LB technique. The films showed pyroelectric effect. The pyroelectric coefficient measured by the method of integrated charges was 12 'mu'C/(m2K) at room temperature, and the relationship between the orientation of DAEP dye in the films and temperature was studied by polarized Fourier transform infrared spectroscopy (FTIR) spectroscopy and second harmonic generation (SHG). It was indicated that the observed pyroelectricity can be ascribed preliminarily to the structure modification of the polar head groups and the deterioration of the film framework (the first-order phase transition) resulted in the change of spontaneous polarization with temperature.
Shihong Ma, Mei Yan, Wencheng Wang, Jinglan Sun, Xiangjian Meng, Junhao Chu . Pyroelectric activity in polar hemicyanine Langmuir-Blodgett multilayer films[J]. Chinese Optics Letters, 2005, 3(0s): 68.