Abstract
We observed proton transfer phenomenon of WO 3 in Au–WO 3 nanocomposite thin-film electrode prepared by sputtering deposition method. The Au–WO 3 nanocomposite electrode formed using both the Au and WO 3 targets consisted of a nano-sized Au crystalline phases and a tungsten oxidative phase, indicating the formation of crystalline Au nanophases, as confirmed by X-ray diffraction analysis and X-ray photoelectron spectroscopy. In particular, due to Au metallic nanophases, the modified electrochromic and electrochemical properties of WO 3 were observed. The Au–WO 3 electrode showed a reverse optical modulation with respect to applied potential compared to that of WO 3 electrode.
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