Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 5, Pages 2294-2299Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.10.204
Keywords
Hydrothermal reaction; o-WO3 microflowers; Optical properties
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Funding
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA)
- Ministry of Science and Technology
- Thailand Research Fund (TRF)
- Center for Innovation in Chemistry (PERCH-CC), Commission on Higher Education (CHE), Ministry of Education, Thailand
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Orthorhombic tungsten oxide (o-WO3) was synthesized by 200 degrees C, 24h hydrothermal reactions of ammonium metatungstate hydrate solutions containing different volumes of 1 M HCl and cetyltrimethylammonium bromide (CTAB) cationic surfactant. The as-synthesized products were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and Raman spectroscopy, and scanning and transmission electron microscopy (SEM, TEM), including UV-visible and photoluminescent (PL) spectroscopy. These analyses showed that their phases and morphologies were controlled by the acidity of the solutions. In 7.50 ml 1 M HCl-added solution, the product was o-WO3 microflowers, with microsquare layers growing out of their cores. FTIR and Raman vibrations of W=O, O-W-O, and W-O-W stretching modes were detected, and showed typical crystalline WO3. Their optical properties showed a maximum absorption at 275 nm in the UV region and a maximum emission peak at 375 nm. The possible formation mechanism of o-WO3 microflowers was also proposed according the experimental results. (C) 2010 Elsevier B.V. All rights reserved.
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