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
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Structure and optical properties of mesoporous tungsten oxide
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 3.5 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 1–2, 21 June 2005, Pages 251-254
نویسندگان
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