SAIP2017

Hydrothermal Synthesis of NiO/graphene electrode and their application in CO sensing

4 Jul 2017, 17:10

1h 50m

3rd and 4th floor passages (Engineering Building 51)

Board: 06

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

Speaker

Mr Abubakar Khaleed (University of Pretoria)

Description

Monitoring trace concentrations of harmful gaseous chemical species are increasingly needed in different areas such as indoor, outdoor, vehicle air control, mining, and manufacturing sites. Hence, the fabrication of highly sensitive and selective chemical gas sensors are imperative. Chemi-resistive gas sensors based on semiconducting transition metal oxide are potential candidates due to their ease of operation, low cost of manufacturing, microscale miniaturization and good thermal and long-term stabilities [1–3]. In this work, spherical NiO/graphene foam (GF) composite with flowerlike structures was successfully synthesized for their application as CO reducing gas sensor via a hydrothermal reflux process. X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transforms infrared spectroscopy (FTIR) and gas sorption analysis was used to characterize the structure and morphology of the samples. The results obtained from the SEM micrographs showed that the flowerlike NiO spheres successfully coated the entire surface area of the GF. The performance of the composite towards CO gas sensing was studied. The results reveal that the incorporation of graphene into flowerlike NiO spheres not only improved the conductivity and surface area of NiO/GF composite but also enhanced the performance of the composite towards CO sensing. These results suggest that the composite could be a potential active material for CO reducing sensors. References [1] Gogotsi, Y., CRC Press, (2006). [2] Huang, X.-J.; Choi, Y.-K., Sensors Actuators B Chem., 122 (2007), 659–671. [3] Lu, J. G.; Chang, P.; Fan, Z., Mater. Sci. Eng. R Reports, 52 (2006), 49–91

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

No

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

Prof Ncholu Manyala, ncholu.manyala@up.ac.za, University of Pretoria

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

Yes

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

PhD