7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Nitrogen dioxide and Ammonia Gas Sensing by Tungsten Trioxide Film

8 Jul 2014, 14:20
D Les 201

D Les 201

Oral Presentation Track A - Division for Physics of Condensed Matter and Materials DPCMM1


Mr Malcolm Govender (CSIR)

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Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Tungsten oxide film was reactively-sputtered on alumina substrate with Pt-contacts from a pure W target and argon/oxygen-plasma. The synthesized and annealed tungsten oxide was characterized with XRD, XPS, Raman spectroscopy, UV/Vis spectroscopy and Resistance as a function of Temperature, and found to be stoichiometric triclinic phase tungsten trioxide. The pure film was used to sense ppm concentrations of nitrogen dioxide and ammonia at room-temperature and 100oC. At 100oC, The sensitivity of the film towards nitrogen dioxide increased, and decreased significantly towards ammonia. This was due to tungsten trioxide being an n-type metal-oxide semiconductor which preferred the reaction with the oxidizing gas over the reducing gas.

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Dr. Bonex W. Mwakikunga

Primary author


Dr Augusto Machatine (University of Pretoria) Dr Bonex Mwakikunga (CSIR) Prof. Herbert Kunert (University of Pretoria) Prof. Sanjay Mathur (University of Cologne, Germany) Dr Trilok Singh (Univeisity of Cologne, Germany) Dr Y Goenuellue (University of Cologne, Germany)

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