Mr
Thokozani Mpanza
(University of Zululand)
There is a considerable desire to control and monitor gas emissions from industries like in mining and energy industries where fossil fuels are used to generate electric power. Most gases emitted from these industries are not environmental friendly since they result in air pollutions, acid rains and global warming. Gas sensors have been reported as promising devices to resolve these issues. In this study a DC magnetron sputtering is used to synthesis tungsten oxide (WO3) doped with carbon nanotubes (CNTs) nanostructures on silicon substrates for gas sensing applications. CNTs are grown on top of WO3 nanoparticles for improving gas sensing properties of WO3. Crystallinity and porosity of the sensor material is expected to enhance the sensitivity and selectivity of the fabricated gas sensor. The structural, morphological and composition were investigated using XRD, SEM equipped with EDS. SEM results shows small size (in nanoscale) of WO3 particles evenly distributed on silicon substrate with some small spaces in between which is promising for gas adsorption. EDS results confirmed the WO3 composition. Due to the spacings between these nanoparticles of WO3, it is therefore expected that the gas sensing properties of this material will improve. This is due to the fact that gas will be easily be adsorbed between the nanoparticles.
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Summary
In this study WO3 nanostructures were successfully deposited on silicon<100>/<111> substrates using DC magnetron sputtering. WO3 films were deposited under various substrate temperatures (450 ᵒC, 500 ᵒC, 600 ᵒC and 700 ᵒC) for successful crystallization of WO3 films. These films were then characterized by the SEM equipped with EDS and XRD. The balance crystallinity and porosity properties of WO3 nanoparticles were achieved at 500 ᵒC and due to these properties WO3 is expected to show good gas sensing properties. Gas sensing properties of WO3 will be measured using kinosistec system, and WO3 film is expected to show a good sensitivity and selectivity to NO2 gas. Doping WO3 with CNTs is expected to show good improvement of gas sensing properties of WO3 material.
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Main supervisor (name and email)<br>and his / her institution
Dr C.L. Ndlangamandla
NdlangamandlaC@unizulu.ac.za
University of Zululand
Mr
Thokozani Mpanza
(University of Zululand)
Dr
Ceboliyazakha Ndlangamandla
(University of Zululand)
Mr
Charles Thethwayo
(University of Zululand)
Prof.
Osman Ndwandwe
(University of Zululand)
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