کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9803694 | 1516471 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and optical properties of mesoporous tungsten oxide
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 396, Issues 1â2, 21 June 2005, Pages 251-254
Journal: Journal of Alloys and Compounds - Volume 396, Issues 1â2, 21 June 2005, Pages 251-254
نویسندگان
Lay Gaik Teoh, Jiann Shieh, Wei Hao Lai, I Ming Hung, Min Hsiung Hon,