| 학회 |
한국화학공학회 |
| 학술대회 |
2009년 봄 (04/23 ~ 04/24, 광주 김대중컨벤션센터) |
| 권호 |
15권 1호, p.576 |
| 발표분야 |
에너지 |
| 제목 |
WO3-sol Syntheis from H2O-controlledPeroxotungsticAcid and Electrochromic WO3 thin film coating |
| 초록 |
WO3 thin film is a representative electrochromic material that can change its color when proton or lithium ion is intercalated and deintercalated by applying electrical potential. For sol-gel coating method, peroxotungstic acid has been used. Normally peroxotungstic acid is synthesized by dissolving tungsten metal in H2O2(30%) solution and acetic acid addition. Peroxotungstic acid has a chemical formula, WO3xH2O2yH2O, where 0.1≤x≤ 0.2, 3≤y≤10. In this research, we controlled the contents of water and hydrogen peroxide by N2 gas bubbling or rotary evaporation. We dissolved various peroxotungstic acid into ethanol to be 1M concentration. WO3 thin film was coated by dip coating method and dried at 100oC and heat-treated at 200oC for 1h. We analyzed half cell electrochromic property tests in 1M LiClO4-PC solution by using Ag/AgCl reference electrode and Pt wire counter electrode. Cyclic voltammetry test was done in the range of -1V and +1V at the sweep voltage rate of 50mV/s. The film thickness of WO3 became thinner when water contents were decreased by N2 bubbling and rotary evaporation. Charge density of WO3 thin film with about 240nm thickness was about 15~20mC/cm2 and trans-mittance change at 613nm wavelength was from 90% to 5%. |
| 저자 |
이 민1, 김창열2, 임태영2, 김은경3
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| 소속 |
1KICET(요업기술원) / 연세대, 2KICET(요업기술원), 3연세대 |
| 키워드 |
전기변색(Electrochromic); WO3; Sol-Gel; Thin film
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| E-Mail |
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| 원문파일 |
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