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Luminescence and photocatalytic activity of ZnO nanocrystals: correlation between structure and property.

Authors
  • Zheng, Yuanhui
  • Chen, Chongqi
  • Zhan, Yingying
  • Lin, Xingyi
  • Zheng, Qi
  • Wei, Kemei
  • Zhu, Jiefang
  • Zhu, Yingjie
Type
Published Article
Journal
Inorganic chemistry
Publication Date
Aug 06, 2007
Volume
46
Issue
16
Pages
6675–6682
Identifiers
PMID: 17622132
Source
Medline
License
Unknown

Abstract

Low-dimensional ZnO nanocrystals with controlled size, aspect ratio, and oxygen defects (e.g., type and concentration) are successfully prepared through simple solvothermal and thermal treatment methods. The structure of the as-synthesized samples is characterized by XRD, N2 physical adsorption, TEM, and IR and XPS spectra. The results show that the aspect ratio and size of the as-synthesized ZnO nanocrystals increase with increasing [OH-]/[Zn2+]; the morphology evolves from nanorod to nanoparticle with an increase in the annealing temperature; the BET surface areas of the corresponding samples decrease during these processes, respectively; and different oxygen defects, which are likely to be oxygen vacancy (Vo**) and interstitial oxygen (Oi''), are formed in our experiments accordingly. With evolution of the structure, IR absorption bands and visible photoluminescence emission peaks of the synthesized ZnO nanocrystals shift and split, which is ascribed to the change of oxygen defects. In addition, it is found that the photocatalytic activity of the synthesized ZnO nanocrystals is mainly dependent on the type and concentration of oxygen defects. The relationship of structure-property and the possible photocatalytic mechanism are discussed in detail.

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