9-13 July 2012
Africa/Johannesburg timezone
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NiS Nanostructures for Application in Room Temperature Gas Sensors

Presented by Ms. Ella CEBISA on 12 Jul 2012 from 08:40 to 09:00
Type: Oral Presentation
Session: DCMPM2
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

One dimensional (1D) nanosized materials (e.g. nanotubes, nanowires and nanorods) are being used extensively in high performance sensor devices owing to their high surface-to-volume ratio, highly crystalline nature and their semiconducting properties. Nickel sulphide (NiS) is an interesting material that has a semiconductor-metal transition (MIT) at approximately 260 K which is close to room temperature. A slight modification of this temperature by metal doping may push the transition temperature towards room temperature, which would make NiS a good candidate for room temperature gas sensing applications. The high crystalline NiS nanostructures were synthesized via a microwave irradiated hydrothermal technique. Analysis of these structures was obtained via the use of electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction spectroscopy and optical analysis techniques. The MIT of the as-synthesized NiS material was confirmed by electronic measurements and the effect of additional impurities on the NiS structure is also reported. The effect of temperature and gas concentration of the sensitivity of these nanostructures will also be discussed briefly.

Award

Yes

Level

PhD

Supervisor

Dr Bonex Mwakikunga CSIR

Paper

Yes

Primary authors

  • Ms. Ella CEBISA National Centre for Nano-structured Materials, Council for Scientific and Industrial ResearchP. O. Box 395, Pretoria, 0001, South Africa
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Co-authors

  • Dr. Bonex MWAKIKUNGA 1National Centre for Nano-structured Materials, Council for Scientific and
  • Dr. Sabelo MHLANGA Molecular Sciences Institute, School of Chemistry, and the DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Johannesburg, Wits 2050, South Africa
  • Prof. Neil COVILLE Molecular Sciences Institute, School of Chemistry, and the DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, Johannesburg, Wits 2050, South Africa
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