Comprehensive understanding on the formation of highly ordered mesoporous tungsten oxides by X-ray diffraction and Raman spectroscopy

Zhou, Liang, Ren, Qi Jun, Zhou, Xu Feng, Tan, Jia Wei, Chen, Zhang Hai and Yu, Chenzhong (2008) Comprehensive understanding on the formation of highly ordered mesoporous tungsten oxides by X-ray diffraction and Raman spectroscopy. Microporous and Mesoporous Materials, 109 1-3: 248-257. doi:10.1016/j.micromeso.2007.04.054


Author Zhou, Liang
Ren, Qi Jun
Zhou, Xu Feng
Tan, Jia Wei
Chen, Zhang Hai
Yu, Chenzhong
Title Comprehensive understanding on the formation of highly ordered mesoporous tungsten oxides by X-ray diffraction and Raman spectroscopy
Journal name Microporous and Mesoporous Materials   Check publisher's open access policy
ISSN 1387-1811
Publication date 2008-03-01
Sub-type Article (original research)
DOI 10.1016/j.micromeso.2007.04.054
Volume 109
Issue 1-3
Start page 248
End page 257
Total pages 10
Editor M. Stöcker
Place of publication Cambridge, U.K.
Publisher Elselvier BV
Language eng
Subject 1007 Nanotechnology
100705 Nanoelectronics
Abstract Highly ordered mesoporous tungsten oxides (WO3) have been synthesized via the hard templating method using mesoporous silica as a hard template and phosphotungstic acid as a precursor. The influences of the calcination temperature, the impregnation ratio of the precursor to the silica hard template and the hydrothermal treatment time of the silica template on the structure of products have been systematically investigated. Both X-ray diffraction and Raman spectroscopy were performed to study the crystalline phases of the resultant mesoporous WO3 as a function of the calcination temperature. The ideal calcination temperature for the synthesis of highly ordered mesoporous WO3 is found to be between 823 and 1073 K. Only a small fraction of crystalline WO3 can be detected in the composites when the calcination temperature is below 773 K. When the calcination temperature is increased from 773 to 1173 K, the monoclinic and triclinic phases of WO3 coexist in the products. Moreover, the ratio of the monoclinic to triclinic phase changes with the variation of the calcination temperature, and it reaches a maximum at about 923 K. Increasing the hydrothermal treatment time of the silica template KIT-6 to 5 days at 373 K favors the synthesis of highly ordered mesoporous WO3. When KIT-6 prepared without hydrothermal treatment is used as the hard template, a symmetry transformation from View the MathML source to I41/a can be observed. The present work provides a convenient and reproducible method for the synthesis of highly ordered mesoporous WO3 materials with crystalline walls, which may find potential applications in different areas.
Keyword Mesoporous
Tungsten oxides
X-ray diffraction
Raman spectroscopy
Synthesis
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes The Official Journal of the International Zeolite Association Publication History: Incorporating Microporous Materials and Zeolites

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 30 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 33 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 22 Dec 2009, 15:02:33 EST by Rosalind Blair on behalf of Aust Institute for Bioengineering & Nanotechnology