| 학회 | 한국재료학회 |
| 학술대회 | 2003년 가을 (11/21 ~ 11/22, 연세대학교) |
| 권호 | 9권 2호 |
| 발표분야 | 세라믹스 |
| 제목 | 솔-젤 스핀 코팅에 의해 증착된 텅스텐 산화물 박막의 반응 온도에 따른 전기변색특성 연구 |
| 초록 | Electrochromism (EC) is defined as a phenomenon in which a change in color takes place in the presence of an applied voltage. Because of their low power consumption, high coloration efficiency, EC devices have a variety of potential applications in smart windows, mirror, and optical switching devices. An EC devices generally consist of a transparent conducting layer, electrochromic cathodic and anodic coloring materials and an ion conducting electrolyte. EC has been widely studied in transition metal oxides(e.g., WO3, NiO, V2O5) Among these materials, WO3 is a most interesting material for cathodic coloration materials due to its high coloration efficiency (CE), large dynamic range, cyclic reversibility, and low cost material. WO3 films have been prepared by a variety of methods including vacuum evaporation, chemical vapor deposition, electrodeposition process, sol-gel synthesis, sputtering, and laser ablation. Sol-gel process is widely used for oxide film at low temperature in atmosphere and requires lower capital investment to deposit large area coating compared to vacuum deposition process. In this study, electrochromic properties of WO3 film were investigated under different preparing temperature condition. The results indicate that electrochromic properties of the sol-gel WO3 film has fast response time and large transmittance change. Fig. 1 shows electrochemical properties of sol-gel WO3 film in the condition of different reactive temperature. The structure, composition and morphology of WO3 film analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS). The electrochemical behaviors of each film were investigated by cyclic voltammtry and chronoamperometry. The optical transmittance was simultaneously measured in-situ during all experiments by using He-Ne laser. Fig. 1 Electrochemical properties of tungsten oxide by preparing sol under different temperature condition ; (a) 70℃ (b) 25℃ |
| 저자 | 심희상, 나윤채, 조인화, 성영은 |
| 소속 | 광주과학기술원 신소재공학과 |
| 키워드 | sol-gel; electrochromic; tungsten oxide |
