4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
Home > Timetable > Session details > Contribution details
PDF | XML | iCal

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

Presented by Ms. Zamaswazi TSHABALALA on 5 Jul 2016 from 16:10 to 18:00
Type: Poster Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.414

Abstract

In this study we report on the effect of annealing temperature on the TiO<sub>2</sub> 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 Ti<sup>4+</sup>- O<sup>2-</sup> and Ti<sup>3+</sup> radicals on the surface and lattice respectively. We observed a decrease in a sensing response as the annealing temperature increases.

Award

Yes

Level

MSc

Supervisor

David Motaung DMotaung@csir.co.za

Paper

Yes

Permission

Yes

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room:


Primary authors

More