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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3441

Title: Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism
Authors: Mwakikunga, BW
Forbes, A
Sideras-Haddad, E
Arendse, C
Keywords: Laser pyrolysis
Tungsten trioxide
Nano-wires
Growth mechanism
Morphology
WO3 nano-wires
O2 ambients
C2H2 ambients
Issue Date: Oct-2008
Publisher: Springer Verlag
Citation: Mwakikunga, BW, Forbes, A, Sideras-Haddad, E and Arendse, C. 2008. Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism. Nanoscale research letters, Vol. 3(10), pp 372-380
Abstract: Laser pyrolysis has been used to synthesize WO3 nanostructures. Spherical nano-particles were obtained when acetylene was used to carry the precursor droplet, whereas thin films were obtained at high flow-rates of oxygen carrier gas. In both environments WO3 nano-wires appear only after thermal annealing of the as-deposited powders and films. Samples produced under oxygen carrier gas in the laser pyrolysis system gave a higher yield of WO3 nano-wires after annealing than the samples which were run under acetylene carrier gas. Alongside the targeted nano-wires, the acetylene-ran samples showed trace amounts of multi-walled carbon nano-tubes; such carbon nano-tubes are not seen in the oxygen-processed WO3 nano-wires. The solid–vapour–solid (SVS) mechanism [B. Mwakikunga et al., J. Nanosci. Nanotechnol., 2008] was found to be the possible mechanism that explains the manner of growth of the nano-wires. This model, based on the theory from basic statistical mechanics has herein been validated by length-diameter data for the produced WO3 nano-wires
Description: Copyright: To the authors 2008
URI: http://hdl.handle.net/10204/3441
ISSN: 1931-7573
Appears in Collections:Nanotechnology
Laser physics and technology
General science, engineering & technology

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