Structural and optical properties of γ-ray irradiated TiO2 single crystals

被引：3
作者：
Liu, Huan [1 ]
Li, Gongping [1 ]
Dejun, E. [1 ]
Xu, Nannan [2 ]
Lin, Qiaolu [1 ]
Gao, Xudong [1 ]
Wang, Canglong [2 ]
机构：
[1] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Gansu, Peoples R China
[2] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
来源：
OPTICAL MATERIALS | 2020年 / 101卷
基金：
中国国家自然科学基金;
关键词：
gamma irradiation; Oxygen vacancy; Optical property; TiO2; ESR; ROOM-TEMPERATURE PHOTOLUMINESCENCE; PHOTOCATALYTIC PROPERTIES; RUTILE; ANATASE;
D O I：
10.1016/j.optmat.2020.109748
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of gamma-ray irradiation on structural and optical properties of TiO2 were investigated. gamma-ray irradiation was skillfully used to induce oxygen vacancy (V-O) in rutile TiO2. Photoluminescence (PL) and Electron Spin-Resonance (ESR) methods employed to characterize V-O defects. Optical properties characterized by UV-Vis spectra, the optical bandgap decreased with the increase in irradiation dose. To verify this phenomenon, the CASTEP module was used to calculate the microstructural and optical properties of V-O, 2V(O), and 3V(O) in rutile TiO2. V-O could induce defects state and new defects levels, which decrease the bandgap and expand the absorption in visible light. Theoretical results agree well with the experimental data.
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页数：6
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