Optimization, Yield Studies and Morphology of WO<sub>3</sub>Nano-Wires Synthesized by Laser Pyrolysis in C<sub>2</sub>H<sub>2</sub>and O<sub>2</sub>Ambients—Validation of a New Growth Mechanism
<p>Abstract</p> <p>Laser pyrolysis has been used to synthesize WO<sub>3</sub>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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2008-01-01
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| Series: | Nanoscale Research Letters |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1007/s11671-008-9169-6 |
| Summary: | <p>Abstract</p> <p>Laser pyrolysis has been used to synthesize WO<sub>3</sub>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 WO<sub>3</sub>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 WO<sub>3</sub>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 WO<sub>3</sub>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 WO<sub>3</sub>nano-wires.</p> |
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| ISSN: | 1931-7573 1556-276X |