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열처리 및 바이올로젠 도입에 따른 TiO<sub>2</sub> 나노튜브의 전기변색 특성
차형철,나윤채,Cha, Hyeongcheol,Nah, Yoon-Chae 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.2
We demonstrate the electrochromic properties of $TiO_2$ nanotubes prepared by an anodization process and investigate the effects of heat treatment and viologen incorporation on them. The morphology and crystal structure of anodized $TiO_2$ nanotubes are investigated by scanning electron microscopy and X-ray diffraction. As-formed $TiO_2$ nanotubes have straight tubular layers with an amorphous structure. As the annealing temperature increases, the anodized $TiO_2$ nanotubes are converted to the anatase and rutile phases with some cracks on the tube surface and irregular morphology. Electrochemical results reveal that amorphous $TiO_2$ nanotubes annealed at $150^{\circ}C$ have the largest oxidation/reduction current, which leads to the best electrochromic performance during the coloring/bleaching process. Viologen-anchored $TiO_2$ nanotubes show superior electrochromic properties compared to pristine $TiO_2$ nanotubes, which indicates that the incorporation of a viologen can be an effective way to enhance the electrochromic properties of $TiO_2$ nanotubes.
차형철,나윤채 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
TiO<sub>2</sub> shows an electrochromic properties when they are electrochemically reduced. However, a color contrast is not strong in the moderate voltage range so that they are limited to the practical device application such as smart windows and rear-view mirrors. Furthermore, a response speed of TiO<sub>2</sub> during electrochromic process is required to be highly enhanced for fast switching optical devices. On the other hand, viologen molecules show a strong electrochromic coloration when they are reduced during the electrochemical reaction. Therefore, viologen anchored TiO<sub>2</sub> nanoparticles are often used as an electrode for a fast switching electrochromic display. Instead of nanoparticles, incorporation of nanotube structure can enhance the electron transfer in the redox reaction and induce more favorable electrochromic properties. In this study, we fabricated the viologen modified TiO<sub>2</sub> nanotube layers Modified TiO<sub>2</sub> layers showed stronger electrochromic coloration and faster response speed.
Electrodeposited WO3 films and their application in electrochromic boards
김대현,강광모,나윤채 한국표면공학회 2022 한국표면공학회지 Vol.55 No.4
WO3 thin films were synthesized by electrodeposition, and their electrochromic properties were investigated. The application of static voltage produced WO3 films with a smooth, compact surface morphology, and the film thickness linearly increased with the application time. The thicker film showed a strong color contrast but a slow color-switching speed. High-temperature heat treatment exceeding 300 ℃ induced a phase transformation from an amorphous to a monoclinic structure and resulted in degraded electrochromic performance. Furthermore, the optimized WO3 thin films demonstrated their potential application as electrochromic boards for writing and erasing letters usinga simple modified 3D printer in a rapid, accurate process.