Hydrogen photochromism in V2O5 layers prepared by the sol–gel technology

•We prepared the V2O5 gel layer by the sol–gel technology to investigate the photochromism.•The comprehensive characterization of the gels was carried out with the help of different technique.•The photochromic sensitivity of the layers was enhanced with thickness.•The position of the arising absorpt...

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Bibliographic Details
Published in:Applied surface science 2014-09, Vol.314, p.384-391
Main Authors: Wang, Yi, Pan, Lei, Li, Yao, Gavrilyuk, A.I.
Format: Article
Language:English
Subjects:
Detaching
Diffusion
Diffusion layers
Hydrogen atoms
Hydrogen diffusion
Oxides
Photochemical reactions
Photochromism
Sol gel process
V2O5
Vanadium pentoxide
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Summary:•We prepared the V2O5 gel layer by the sol–gel technology to investigate the photochromism.•The comprehensive characterization of the gels was carried out with the help of different technique.•The photochromic sensitivity of the layers was enhanced with thickness.•The position of the arising absorption band in the spectral range was dependant on the concentration of inserted hydrogen atoms. Here we report on hydrogen photochromism in V2O5 highly disordered layers, i.e., photochromism that occurs due to hydrogen atoms; the hydrogen being detached under the action of light from organic molecules adsorbed on the oxide surface, whereas the V2O5 layers have been prepared by the sol–gel technology. The comprehensive characterization of the layers has been carried out, as well as the investigation of the parameters influencing their photochromic sensitivity. The high photochromic sensitivity of the V2O5 layers is provided by the surface Grotthuss diffusion of the injected protons.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.06.167