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dc.contributor.author | Govender, Malcolm![]() |
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dc.contributor.author | Mwakikunga, B.W.![]() |
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dc.contributor.author | Machatine, Augusto Gonçalo Jose![]() |
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dc.contributor.author | Kunert, Herbert W.![]() |
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dc.date.accessioned | 2015-08-26T05:56:01Z | |
dc.date.available | 2015-08-26T05:56:01Z | |
dc.date.issued | 2014-02 | |
dc.description.abstract | Laser pyrolysis is a synthesis method used to produce thin films and nanomaterials of high quality and purity, by intersecting a laser beam with a chemical precursor. We have chosen laser pyrolysis to synthesize tungsten trioxide starting with tungsten ethoxide precursor. The film had a thickness that varied from 205 nm to 1 μm. Xray diffraction and Raman spectroscopy confirmed the presence of a mixture of hexagonal and tetragonal phase WO3 in the synthesized film, and it was clear that annealing greatly influenced the phases and types of structures formed. I-V curves of the films showed n-type semiconducting behaviour, but the mixed phase appeared to cause a similar behaviour of dopants in a semiconductor. The refractive index decreased with increasing wavelength and gave values of up to 21 at low wavelengths. The average optical band gap was found to 3.6 eV from UV/Vis spectroscopy. Scanning Electron Microscopy (SEM) showed a mixture of nano- and microstructures and shapes formed after annealing. One of the grown nanostructures was nanorods, this isolated using FIB for possible applications such as an active sensing medium in gas sensors. | en_ZA |
dc.description.librarian | hb2015 | en_ZA |
dc.description.uri | http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1610-1642a | en_ZA |
dc.identifier.citation | Govender, M, Mwakikunga, BW, Machatine, AGJ & Kunert, HW 2014, 'Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis', Physica Status Solidi C, vol. 11, no. 2, pp. 349-354. | en_ZA |
dc.identifier.issn | 1862-6351 (print) | |
dc.identifier.issn | 1610-1642 (online) | |
dc.identifier.other | 10.1002/pssc.201300212 | |
dc.identifier.uri | http://hdl.handle.net/2263/49595 | |
dc.language.iso | en | en_ZA |
dc.publisher | Wiley | en_ZA |
dc.rights | © 2014 Wiley-VCH Verlah GmbH & Co.KGaA, Weinheim. This is the pre-peer reviewed version of the following article : Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis, Physica Status Solidi. C, vol. 11, no. 2, pp. 349-354, 2014. doi : 10.1002/pssc.201300212. which has been published in final form at : http://onlinelibrary.wiley.comjournal/10.1002/(ISSN)1610-1642a. | en_ZA |
dc.subject | Laser pyrolysis | en_ZA |
dc.subject | Tungsten trioxide | en_ZA |
dc.subject | Nanorods | en_ZA |
dc.subject | FIB-SEM | en_ZA |
dc.subject | Gas sensors | en_ZA |
dc.title | Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis | en_ZA |
dc.type | Postprint Article | en_ZA |