4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

Effect of Hydrochloric Acid on the Structure, Defect States and Gas Sensing Properties of TiO<sub>2</sub> Nanotubes by Hydrothermal Method

7 Jul 2016, 10:00
20m
LT1 (Kramer Law building)

LT1

Kramer Law building

UCT Middle Campus Cape Town
Oral Presentation Track A - Division for Physics of Condensed Matter and Materials Division for Physics of Condensed Matter and Materials (1)

Speaker

Mrs Zamaswazi Tshabalala (CSIR and UFS)

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

David Motaung DMotaung@csir.co.za

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

Yes

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>

We report on the enhanced gas sensing properties of TiO2 nanotubes synthesized following a microwave assisted hydrothermal method followed by washing with various concentrations of Hydrochloric acid (HCl) and distilled water (DW). The Scanning electron microscope displayed a change in morphology from nanoparticles to nanotubes after hydrothermal treatment. The nanotubes washed with DW only displayed narrow nanotubes with diameter approximately 13.92 nm. Samples washed with 0.25 and 0.5 M of HCl have diameters approximately 15.08 and 17.09 nm respectively. Introducing 1.0 M HCl more nanotubes were formed with average diameter approximately 22.27 nm. The structural analyses displayed a mixture of anatase and rutile phase with anatase dominating. Moreover, an increase in crystallinity and growth in diameter of the nanotubes is observed at higher HCl concentration. The Photoluminescence (PL) and the Electron paramagnetic resonance (EPR) analysis showed high concentration of oxygen vacancies (Vo) which have a high contribution on the gas sensing. The gas sensing properties such response, sensitivity and selectivity were carried out towards CH4, H2, NH3, CO and NO2 gas at different temperatures. The enhanced sensitivity of the TiO2 nanotubes was attributed to the high surface area provided by the one dimensional nanotubes since they behave as nanochannels for gas diffusion.

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD, N/A)?

MSc

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Primary author

Mrs Zamaswazi Tshabalala (CSIR and UFS)

Co-authors

Dr David Motaung (CSIR) Ms Gugu Mhlongo (CSIR/UFS) Prof. Martin Ntwaeaborwa (UFS)

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