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Molybdenum polyoxometalate impregnated amino- functionalized mesoporous silica thin films as multifunctional materials for photochromic and electrochemical applications

Published online by Cambridge University Press:  31 January 2011

Xueao Zhang ,
Wenjian Wu ,
Jianfang Wang ,
Changli Liu  and
Siwen Qian
Xueao Zhang*
Affiliation:
College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China
Wenjian Wu
Affiliation:
College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China
Jianfang Wang
Affiliation:
College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China
Changli Liu
Affiliation:
College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China
Siwen Qian
Affiliation:
College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: xazhang@nudt.edu.cn
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Abstract

Molybdenum polyoxometalate (PMo)/silica mesoporous composite thin films, which can be applied as multifunctional materials for photochromic and electrochemical applications, were prepared by impregnating PMo into amino-functionalized mesoporous silica thin films. The composite thin films possess excellent reversible photochromic properties and change from colorless to blue under ultraviolet (UV) irradiation. It is shown in the study that intervalence charge transfer and ligand-to-metal charge transfer are the main reasons for photochromism. After UV irradiation, the charge transfer occurs by the reduction of heteropolyanions accompanying the formation of heteropolyblues with multivalence Mo (+6, +5), and the bleaching process of composite thin films is closely related to the presence of oxygen. Moreover, the composite thin films deposited on the indium tin oxide (ITO) substrate can be used as the electrode and have many advantages, including simple fabrication, fast response, and good stability. The modified ITO electrode retains the electrochemical properties of PMo, can catalyze the electroreduction of the BrO3−, and may be used as the current sensor for the BrO3−.

Keywords

Electrical propertiesPhotochemicalThin film
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 18 - 26
Copyright
Copyright © Materials Research Society 2008

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References

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