| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9803694 | Journal of Alloys and Compounds | 2005 | 4 Pages |
Abstract
Mesoporous WO3 was prepared by the sol-gel process and the structure and the optical properties have been investigated. Various techniques were used for characterization of mesoporous WO3, including Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms and UV-vis spectroscopy. TEM and XRD analyses demonstrated that the mesoporous WO3 was nanocrystalline. The estimated optical band gap (Eg) for the mesoporous WO3 was 3.5Â eV. We present evidence for a photoreduction of W6+ into W5+ following the irradiation with UV-light. The change in coloration is almost reversible as exposed in oxidation environment. These results suggest that the potential applications of mesostructured WO3 with nanocrystals in the design of optical devices.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Lay Gaik Teoh, Jiann Shieh, Wei Hao Lai, I Ming Hung, Min Hsiung Hon,