Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 8, Pages 4024-4030Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am300835p
Keywords
zinc oxide; oxygen vacancy; zinc peroxide; band gap narrowing; photocatalysis
Funding
- National Science Foundation of China [51002091, 20973102, 51021062]
- Specialized Research Fund for the Doctoral Program of Higher Education [20100131120028]
- National Basic Research Program of China [2007CB613302]
- Natural Science Foundation of Shandong province [ZR2010BQ005]
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Oxygen vacancies in crystal have important impacts on the electronic properties of ZnO. With ZnO2 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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