电致变色
材料科学
循环伏安法
无定形固体
薄膜
计时安培法
基质(水族馆)
蒸发
电致变色装置
沉积(地质)
电极
光电子学
真空蒸发
分析化学(期刊)
纳米技术
电化学
化学
热力学
海洋学
物理
地质学
物理化学
古生物学
有机化学
生物
色谱法
沉积物
作者
Ayat Esmail,H. Hashem,S. Soltan,M. Hammam,A. A. Ramadan
标识
DOI:10.1002/pssa.201600478
摘要
WO 3 films of different thicknesses (100, 200, and 300 nm) were prepared by two vacuum physical vapor deposition (PVD) methods (thermal evaporation and an electron gun). Electrophysical measurements (cyclic voltammetry and chronoamperometry) were carried out using a potentiostat in an electrochromic cell (liquid device) that consists of a substrate coated with double layers of F: SnO 2 and WO 3 served as working electrodes. X‐ray diffraction showed an amorphous structure for all the deposited WO 3 thin films. While the transmission in the bleached state does not change and it is close to the as‐deposited state, it is slightly less at larger thickness. The cyclic voltammogram was more open (more current flow) for thicker films due to the less dense structure with many channels. Also, the coloration efficiency was higher at low thickness. The response time was of the order of seconds and decreased for coloration, while it increased for the bleaching process as the film thickness increases. According to the proposed figure of merit, the electrochromic performance deteriorates as the WO 3 film thickness decreases. However, the thickness is more effective in the case of an electron gun. Generally, continuous films but thinner than 200 nm, are recommended for deposition methods.
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