SAIP2016

The Effect of Annealing Temperature on the Sensitivity and Selectivity of TiO₂ base Gas Sensors

5 Jul 2016, 16:10

1h 50m

Kramer Law building

Board: A.414

Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster Session (1)

Speaker

Ms Zamaswazi Tshabalala (CSIR and UFS)

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

MSc

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

Yes

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

Yes

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

Yes

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

David Motaung DMotaung@csir.co.za

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>

In this study we report on the effect of annealing temperature on the TiO₂ nanostructure based chemoresistive gas sensors synthesized using microwave assisted hydrothermal treatment. The sensing response, structural, optical and magnetic properties were carried out using various analytical techniques. The X-ray diffraction, Raman and transmission electron microscope displayed an increase in rutile (110) and (101) peaks at 700 °C annealing temperature. The scanning electron microscope revealed that the web of nanotubes transforms to short nanorod like structures at 700 °C. Photoluminescence analysis showed an increase in band edge and a decrease in oxygen vacancies concentration as the annealing temperature increases. The electron paramagnetic resonance displayed room temperature ferromagnetism due to the presence of Ti⁴⁺- O^2- and Ti³⁺ radicals on the surface and lattice respectively. We observed a decrease in a sensing response as the annealing temperature increases.