期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 791, 期 -, 页码 722-729出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.395
关键词
ZnO@C core@shell particles; Far-red emission ZnO; Surface oxygen vacancies
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.03-2016.68]
We develop a novel approach to create oxygen vacancies on the surface of ZnO particles and investigate their role in the photoluminescence of the ZnO. In this approach, the commercial ZnO powder is coated with a thin carbon layer using ball-milling technique, forming ZnO@C core@shell particles. By annealing the as-milled ZnO@C at a relatively low temperature (i.e., up to 600 degrees C) in oxygen, the surface oxygen vacancies are formed, which is confirmed by X-ray photoelectron spectroscopy analyses. The annealed powders show red photoluminescence, which largely covers the far-red region, and by varying the annealing temperature, the emission range of the ZnO can be tailored. We found that the far-red emission is associated with the surface oxygen vacancies of ZnO. (C) 2019 Elsevier B.V. All rights reserved.
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