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- Title
Microstructure, optical and photoelectron-chemical properties of TiO microspheres prepared by hydrothermal method.
- Authors
Jiang, Xishun; Zhang, Yafang; Li, Zhongwei; Ren, Yunfang; Zhang, Miao; He, Gang; Song, Xueping; Sun, Zhaoqi
- Abstract
Anatase TiO microspheres have been prepared by hydrothermal method and the reaction concentrations of mix solution containing hydrofluoric acid (HF) and ammonium fluoride (NHF) are 0.1, 0.2, and 0.4 M, respectively. Microstructure, morphology, chemical composition, optical and photoelectron-chemical properties of the as-deposited thin films were investigated in detail. XRD analysis shows that the grain size of the microspheres increases with increasing the reaction concentration. The films deposited at 0.1 and 0.2 M are formed by wellfaceted, regular microspheres with the size of 2-3 μm. XPS measurement indicates that the atomic ratio of Ti:O is estimated to be 1:2.05 for the sample deposited at 0.2 M. The band gap is close to the standard values of anatase TiO 3.2 eV as the reaction concentration increases. The photocurrent of TiO film deposited for 0.1 M reaction concentration is around three times as strong as those for 0.2 and 0.4 M under the same illumination. Current results will help to synthesise desired TiO films and expand its applications.
- Subjects
PHOTOELECTRONS; TITANIUM oxides; HYDROTHERMAL synthesis; HYDROFLUORIC acid; AMMONIUM fluoride; X-ray diffraction
- Publication
Journal of Materials Science: Materials in Electronics, 2015, Vol 26, Issue 4, p2070
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2649-9