| 학회 |
한국고분자학회 |
| 학술대회 |
2017년 가을 (10/11 ~ 10/13, 제주컨벤션센터) |
| 권호 |
42권 2호 |
| 발표분야 |
대학원생 구두발표(발표15분) |
| 제목 |
Extraordinary Enhancement of UV Absorption in TiO2 Particles Decorated with Low-Oxidized Graphene Nanodots |
| 초록 |
Titanium oxide (TiO2) has been utilized in various applications including environmental and energies with its strong ultraviolet (UV) absorption. Accordingly, it is greatly demanded to further improve the UV absorption of TiO2 to broaden its versatility. Here, we report a strong UV absorption enhancement from TiO2 NPs achieved by decorating graphene nanodots (GNDs) with low oxygen concentration. Chemically-bonded TiO2 NPs/GNDs composites exhibit highly tunable UV absorption, achieving over 280% enhancement of optical density at the absorption band at 338 nm. Their underlying mechanism has been identified to direct charge transfer absorption from LUMO level of the low-oxidized GNDs which have a wide band gap (~3.1 eV) with their extremely low oxygen concentration to conduction band of TiO2 NPs. Also, the significantly improved photocatalytic dye degradation and UV shielding results of the composites reveal their high promise for applications benefiting from enhanced UV absorption. |
| 저자 |
윤혜원, 박민수, 김정모, 김진, 이진호, 전석우
|
| 소속 |
한국과학기술원 |
| 키워드 |
Graphene nanodots; TiO2; UV absorption; Charge transfer absorption
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| E-Mail |
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