การสังเคราะห์ฟิล์มทังสเตนไตรออกไซด์เจือโมลิบดีนัมไตรออกไซด์ร่วมกับไนโอเบียมเพนทอกไซด์

Abstract

This research aims to synthesize tungsten trioxide films co-doping with molybdenum trioxide and niobium pentoxide applied for the electrochromic materials. Films were prepared by dip-coating method and then deposited onto indium-doped tin oxide glass substrate. The study composed of two parts. First, the synthesized molybdenum trioxide was doped into tungsten trioxide sol with the doping concentrations of 15, 30 and 50 %mol. The synthesized films were characterized using XRD, XPS, SEM, EDX, and AFM. The films structure was monoclinic. Color change of films was determined by using cyclic voltammetry and UV-Vis spectrophotometer. It was found that the 30 %mol molybdenum trioxide doped tungsten trioxide film exhibited the optimum diffusion coefficient of 1.24 x 10 cm2/s and showed about 44% transmittance modulation. Second, the films co-doped with molybdenum trioxide and niobium pentoxide were prepared and examined. Tungsten trioxide film with molybdenum trioxide at 30% mol doping with niobium pentoxide 0.1 to 0.9 %mol were synthesized. The result indicated that the tungsten trioxide film co-doping with molybdenum trioxide at 30 %mol together with niobium pentoxide 0.5 %mol showed the best diffusion coefficient of 1.93 x 10-9 cm2/s, but the transmittance modulation was reduced to 33%.