An investigation on the assembling of WO3 particles on the matrix of silica solution

作者：Gao Guohua; Feng Wei; Wu Guangming^*; Shen Jun; Zhang Zenghai; Jin Xiaobo; Zhang Zhihua; Du Ai

来源：Journal of Sol-Gel Science and Technology, 2012, 64(2): 427-435.

DOI：10.1007/s10971-012-2873-9

• WO3
• Sol-gel
• Assembling
• Silica solution
• Gas sensing

A facile way to prepare modified WO3 structure by silica support through sol-gel method is reported. The WO3/SiO2 complex film was synthesized from a two steps process and dip-coating method. The films were characterized with laser particle analyzer, IR, Raman. The studies of gelation time and particle size distribution of WO3/SiO2 sol indicate that the silica addition could largely reduce the polycondensation of WO3 clusters. The reaction between WO3 and SiO2 were further systematically investigated using IR spectra, and an insight of this reaction was illuminated. Results reveal that Si-OH in SiO2 sols tended to crosslink with WO3 at the corner-sharing W-O sites, by which only edge-sharing WOx clusters could be detected. This modified the WO3 structure was also approved by the Raman spectra, TEM and AFM images. Moreover, gas sensing properties of the WO3/SiO2 films were tested. The assembled WO3 films exhibited more stable gas sensing stability than pure WO3 films.

• 出版日期2012-11
• 单位同济大学