Synthesis of tungsten oxide nanoparticles using a hydrothermal method at ambient pressure

Ahmadi, M. and Younesi, R. and Guinel, M. J. F.. (2014) Synthesis of tungsten oxide nanoparticles using a hydrothermal method at ambient pressure. Journal of Materials Research, 29 (13). pp. 1424-1430.

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Tungsten oxide (WO3) nanostructures receive sustained interest for a wide variety of applications, and especially for its usage as a photocatalyst. It is therefore important to find suitable methods allowing for its easy and inexpensive large scale production. Tungstite (WO3 center dot H2O) nanoparticles were synthesized using a simple and inexpensive low temperature and low pressure hydrothermal (HT) method. The precursor solution used for the HT process was prepared by adding hydrochloric acid to diluted sodium tungstate solutions (Na2WO4 center dot 2H(2)O) at temperatures below 5 degrees C and then dissolved using oxalic acid. This HT process yielded tungstite (WO3 center dot H2O) nanoparticles with the orthorhombic structure. A heat treatment at temperatures at or above 300 degrees C resulted in a phase transformation to monoclinic WO3, while preserving the nanoparticles morphology. The production of WO3 nanoparticles using this method is therefore a three step process: protonation of tungstate ions, crystallization of tungstite, and phase transformation to WO3. Furthermore, this process can be tailored. For example, we show that WO3 can be doped with cesium and that nanorods can also be obtained. The products were characterized using powder x-ray diffraction, transmission electron microscopy (including electron energy-loss spectroscopy and electron diffraction), and x-ray photoelectron spectroscopy.

Item Type: Article
Additional Information: Ahmadi, Majid Younesi, Reza Guinel, Maxime J-F.
Collections: Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for Hierarchical Manufacturing
Depositing User: Robert Stevens
Date Deposited: 19 Aug 2015 21:29
Last Modified: 19 Aug 2015 21:29

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