Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients

Mwakikunga, Bonex WForbes, ASideras-Haddad, EArendse, C2009-06-172009-06-172008-10Mwakikunga, 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 372-3801931-7573http://hdl.handle.net/10204/3441Copyright: To the authors 2008Laser 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-wiresenLaser pyrolysisTungsten trioxideNano-wiresGrowth mechanismMorphologyWO3 nano-wiresO2 ambientsC2H2 ambientsOptimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanismArticleMwakikunga, B. W., Forbes, A., Sideras-Haddad, E., & 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. http://hdl.handle.net/10204/3441Mwakikunga, Bonex W, A Forbes, E Sideras-Haddad, and C Arendse "Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism." (2008) http://hdl.handle.net/10204/3441Mwakikunga BW, Forbes A, Sideras-Haddad E, Arendse C. Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism. 2008; http://hdl.handle.net/10204/3441.TY - Article AU - Mwakikunga, Bonex W AU - Forbes, A AU - Sideras-Haddad, E AU - Arendse, C AB - 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 DA - 2008-10 DB - ResearchSpace DP - CSIR KW - Laser pyrolysis KW - Tungsten trioxide KW - Nano-wires KW - Growth mechanism KW - Morphology KW - WO3 nano-wires KW - O2 ambients KW - C2H2 ambients LK - https://researchspace.csir.co.za PY - 2008 SM - 1931-7573 T1 - Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism TI - Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism UR - http://hdl.handle.net/10204/3441 ER -