화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.429, 237-237, 2005
Characterization of tungsten trioxide thin film deposited by spin coating and the effect on their insertion in liquid crystal cells
The asymmetric insertion of oxide layers having mixed conduction properties (ionic and electronic) in liquid crystal cells induce various kinds of electro-optical response of the liquid crystals, and this behaviour has been related to the structured differences of the inserted films. In, this work, is reported a structural study of such oxide films deposited on indium tin oxide (ITO) covered glasses. To have further confirmations of the model and a better understanding of the basic mechanism underlying the rectification effect and the connections with the structural and electrical properties of the films, WO,7 layers have been Studied before and after thermal. Moreover the gelification via spin-coating, has been implemented and the optimization test of various relevant parameters have been performed. The chemical, structural and optical evolution has been extensively investigated as a function of the thermal annealing treatment, by performing vibrational spectroscopy analysis (micro-Raman and IR) impedance spectroscopy characterization and. spectroscopic ellipsometry, before testing the films into the NLC cells.