(1) Nissan Research Center, Nissan Motor Co., Ltd., 1, Natsushima, 237 Yokosuka, Kanagawa, Japan;(2) National Institute of Materials and Chemical Research, 1-1, Higashi, 305 Tsukuba, Ibaraki, Japan
Abstract:
Tungsten oxide films were prepared by a complexing agent-assisted sol-gel process. All the films were at 500°C were crystalline and transparent. The refractive index n and extinction coefficient k of the films were calculated from the transmittance and reflectance spectra in the visible and infrared regions. The values of n were lowered to depend on the organic ligands used in the preparation of the sols. The use of such ligands may be a mean to control the refractive index of coatings.