Статья

Oxygen Vacancy Induced Band-Gap Narrowing and Enhanced Visible Light Photocatalytic Activity of ZnO

Junpeng WangState Key Lab of Crystal Materials, Shandong University, Jinan 250100, ChinaZeyan WangState Key Lab of Crystal Materials, Shandong University, Jinan 250100, ChinaBaibiao HuangState Key Lab of Crystal Materials, Shandong University, Jinan 250100, ChinaYandong MaSchool of Physics, Shandong University, Jinan 250100, ChinaYuanyuan LiuState Key Lab of Crystal Materials, Shandong University, Jinan 250100, ChinaXiaoyan QinState Key Lab of Crystal Materials, Shandong University, Jinan 250100, ChinaXiaoyang ZhangState Key Lab of Crystal Materials, Shandong University, Jinan 250100, ChinaYing DaiSchool of Physics, Shandong University, Jinan 250100, China

2012en

ABI

Аннотация

Oxygen vacancies in crystal have important impacts on the electronic properties of ZnO. With ZnO(2) as precursors, we introduce a high concentration of oxygen vacancies into ZnO successfully. The obtained ZnO exhibits a yellow color, and the absorption edge shifts to longer wavelength. Raman and XPS spectra reveal that the concentration of oxygen vacancies in the ZnO decreased when the samples are annealed at higher temperature in air. It is consistent with the theory calculation. The increasing of oxygen vacancies results in a narrowing bandgap and increases the visible light absorption of the ZnO. The narrowing bandgap can be confirmed by the enhancement of the photocurrent response when the ZnO was irradiated with visible light. The ZnO with oxygen vacancies are found to be efficient for photodecomposition of 2,4-dichlorophenol under visible light irradiation.

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Идентификаторы

DOI: 10.1021/am300835p

Цитирования и источники

Цитирований: 4Использованных источников: 0

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