Synthesis and characterization of tungsten trioxide powders prepared from tungstic acids |
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| Affiliation: | 1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. PhD''s Degree Program in Applied Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Institute of Electronic Structure and Laser (IESL), FORTH, Vasilika Vouton, GR 70013 Heraklion, Greece;4. Thailand Organic and Printed Electronics Innovation Center, National Electronics and Computer Technology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand;5. Center of Advanced Materials of Printed Electronics and Sensors, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;6. Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand;1. School of Metallurgical Science & Engineering, Central South University, Changsha 410083, China;2. Key Laboratory for Metallurgy and Material Processing of Rare Metals, Changsha 410083, China |
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| Abstract: | WO3 powders were prepared by the thermal decomposition of tungstic acids (WO3·nH2O, n=1/3, 1, 2). The tungstic acids were synthesized from WO42− aqueous solutions under a variety of conditions of pH, temperature and W(VI) concentrations. The thermal decomposition of the tungstic acids into WO3 was analysed by TG and DSC methods. Nano-sized WO3 powders with different morphological characteristics were obtained by thermal treatment of the tungstic acids at 500 °C in air atmosphere. The morphologies of WO3 powders were characterised by scanning electron microscopy and infrared absorption spectroscopy. Patterns of infrared spectra were related with distinct powder morphologies. |
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