| 학회 |
한국재료학회 |
| 학술대회 |
2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 |
26권 1호 |
| 발표분야 |
E. 환경/센서 재료 분과 |
| 제목 |
Optical Maze-like TiO2 Nanonetworks for Efficient Photo-activated Chemiresistors at Room-Temperature |
| 초록 |
One of the top design priorities for achieving the high-performance photo-activated gas sensors based on TiO2 is to develop the efficient structural platform in terms of the light absorption and active channel to target gas molecules. However, no study has provided fundamental strategies to offer a rational structure for maximizing their optical and chemical performances. Here, a new class of a highly periodic TiO2 nanoarchitecture, which serves as an optical maze facilitating 47 times enhanced light absorption by confining the incident light in the structure, compared to pristine TiO2 thin film, is prepared. The key parameters of the structure are precisely investigated by finite element analysis (FEA) of the unit cells and experimentally verified. In particular, intermediate band states of the fabricated TiO2 originated from interstitial titanium and oxygen vacancies enable the drastic extension of the photo-activation range to all the visible light range beyond the ultraviolet. Collectively, these attributes lead to ultrahigh response to nitrogen dioxide with detection limits down to parts per trillion levels and power consumption less than 0.8 microwatts. |
| 저자 |
심영석, 임지산, 김찬걸, 오현진, 박수완, 이명한
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| 소속 |
신라대 |
| 키워드 |
nanostructure; light scattering; titanium dioxide; room temperature; gas sensor
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| E-Mail |
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