Polyoxometalate-based gasochromic silica

Bingbing Xu; Lin Xu; Guanggang Gao; Zhikui Li; Yu Liu; Weihua Guo; Liping Jia

doi:10.1039/B801764F

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New Journal of Chemistry

Issue 6, 2008

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Polyoxometalate-based gasochromic silica

Bingbing Xu , Lin Xu , Guanggang Gao , Zhikui Li , Yu Liu , Weihua Guo and Liping Jia

New J. Chem., 2008, 32, 1008-1013

DOI: 10.1039/B801764F
Received 31 Jan 2008, Accepted 03 Mar 2008
First published on the web 21 Apr 2008

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Abstract
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Materials capable of gasochromic behavior are still rare. In this paper, amorphous gasochromic hybrid silica material containing phosphomolybdic acid (PMo₁₂) is prepared by the sol–gel technique. The structure and properties of the material are investigated by cyclic voltammetry, thermal gravimetric analysis, FT-IR spectra, X-ray diffraction, UV-Vis spectra and X-ray photoelectron spectra. The structural integrity of phosphomolybdic acid has been preserved after incorporation into the porous silica framework. Furthermore, the PMo₁₂–SiO₂ hybrid material shows sensing activity for H₂S and SO₂ gases at room temperature based on the color change.

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The dependence of cathodic peak currents on scan rates and the square roots of scan rates for PMo ₁₂ aqueous-modified electrode and PMo ₁₂ sol-modified electrode (Fig. S1), XPS spectra of molybdenum and sulfur elements for the silica after exposure to SO ₂ (Fig. S2), X-ray diffraction pattern of silica containing PMo ₁₂ (Fig. S3), and main relevant IR data observed for PMo ₁₂ and PMo ₁₂–SiO ₂ hybrid materials (Table S1)
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Bingbing Xu
Lin Xu
Guanggang Gao
Zhikui Li
Yu Liu
Weihua Guo
Liping Jia

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New Journal of Chemistry

Polyoxometalate-based gasochromic silica

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