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전기증착법으로 제조된 다공성 텅스텐 산화물의 고대비 전기변색 특성
박성혁,모호진,임재근,김상권,최재효,이승현,장세화,차경호,나윤채,Park, Sung-Hyeok,Mo, Ho-Jin,Lim, Jae-Keun,Kim, Sang-Gwon,Choi, Jae-Hyo,Lee, Seung-Hyun,Jang, Se-Hwa,Cha, Kyung-Ho,Nah, Yoon-Chae 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.1
In this study, we synthesize tungsten oxide thin films by electrodeposition and characterize their electrochromic properties. Depending on the deposition modes, compact and porous tungsten oxide films are fabricated on a transparent indium tin oxide (ITO) substrate. The morphology and crystal structure of the electrodeposited tungsten oxide thin films are investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). X-ray photoelectron spectroscopy is employed to verify the chemical composition and the oxidation state of the films. Compared to the compact tungsten oxides, the porous films show superior electrochemical activities with higher reversibility during electrochemical reactions. Furthermore, they exhibit very high color contrast (97.0%) and switching speed (3.1 and 3.2 s). The outstanding electrochromic performances of the porous tungsten oxide thin films are mainly attributed to the porous structure, which facilitates ion intercalation/deintercalation during electrochemical reactions.