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Formation of tungsten oxide nanostructures by laser pyrolysis: stars, fibres and spheres

Govender, Malcolm and Shikwambana, Lerato and Mwakikunga, Bonex Wakufwa and Sideras-Haddad, Elias and Erasmus, Rudolph Marthinus and Forbes, Andrew (2011) Formation of tungsten oxide nanostructures by laser pyrolysis: stars, fibres and spheres. Nanoscale Research Letters, 6 (1). pp. 1-8.

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Official URL: http://www.nanoscalereslett.com/content/6/1/166

Abstract

In this letter, the production of multi-phase WO3 and WO3-x (where x could vary between 0.1 and 0.3) nanostructures synthesized by CO2-laser pyrolysis technique at varying laser wavelengths (9.22-10.82 mm) and power densities (17-110 W/cm2) is reported. The average spherical particle sizes for the wavelength variation samples ranged between 113 and 560 nm, and the average spherical particle sizes for power density variation samples ranged between 108 and 205 nm. Synthesis of W18O49 (= WO2.72) stars by this method is reported for the first time at a power density and wavelength of 2.2 kW/cm2 and 10.6 μm, respectively. It was found that more concentrated starting precursors result in the growth of hierarchical structures such as stars, whereas dilute starting precursors result in the growth of simpler structures such as wires.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanostructured materials
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10980
Deposited By:JNCASR
Deposited On:10 May 2011 11:46
Last Modified:10 May 2011 11:46

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