Characterization of gasochromic vanadium oxides films by X-ray absorption spectroscopy

被引：24
|
作者：
Ho, Y. K. [1 ,2 ]
Chang, C. C. [1 ]
Wei, D. H. [2 ]
Dong, C. L. [3 ]
Chen, C. L. [1 ]
Chen, J. L. [3 ,4 ]
Jang, W. L. [3 ]
Hsu, C. C. [3 ]
Chan, T. S. [3 ]
Kumar, Krishna [5 ]
Chang, C. L. [4 ]
Wu, M. K. [1 ]
机构：
[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[2] Natl Taipei Univ Technol, Dept Mech Engn, Taipei 106, Taiwan
[3] Natl Synchrotron Radiat Res Ctr NSRRC, Hsinchu 30076, Taiwan
[4] Tamkang Univ, Dept Phys, Tamsui, Taiwan
[5] Inst Technol Tallaght ITT Dublin, Dept Sci, Dublin 24, Ireland
来源：
THIN SOLID FILMS | 2013年 / 544卷
关键词：
Vanadium oxide; Thin films; Gasochromic; Sol-gel; XAS; THERMOCHROMIC SMART GLASS; DOUBLE-LAYERED FILMS; THIN-FILMS; PHASE; V2O5; SPECTRA;
D O I：
10.1016/j.tsf.2013.02.080
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A series of vanadium oxide thin films with different layer thicknesses were prepared by the sol-gel process. These V2O5 thin films exhibited excellent gasochromic performance with color change from yellow to gray/black on exposure to hydrogen gas and fast response rate under ambient condition. The structure and morphology of the films were investigated by X-ray powder diffractometer and scanning electron microscope. The H-2 gasochromic property and the optical transmittance change of colored and bleached films were characterized by UV-visible spectrophotometer. Further, the gasochromic effect and the coloration mechanism of these films were investigated in detail by X-ray absorption spectroscopy. The investigations demonstrated that due to insertion of hydrogen ions, the valence state of vanadium varied from 4.8(+) to 4.1(+) and a distortion was observed in the structural symmetry of VO6 octahedron. (C) 2013 Elsevier B. V. All rights reserved.
引用
收藏
页码：461 / 465
页数：5
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