Title: Gas sensing applications of multilayer graphene grown on Co-Ni/Al2O3 substrate by chemical vapour deposition

Authors: May Ali; Bamidele Victor Ayodele; Faizah Md Yasin; Mohd Nizar Hamidon; Suraya Abdul Rashid

Addresses: Department of Chemical Engineering, University of Technology Iraq, Baghdad, Iraq ' Institute of Energy Policy and Research, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia ' Faculty of Engineering, Chemical and Environmental Engineering Department, Universiti Putra Malaysia, 43400, Selangor, Malaysia; Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400, Serdang, Selangor Darul Ehsan, Malaysia ' Faculty of Engineering, Electrical and Electronics Engineering Department, Universiti Putra Malaysia, 43400, Selangor, Malaysia; Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400, Serdang, Selangor Darul Ehsan, Malaysia ' Faculty of Engineering, Chemical and Environmental Engineering Department, Universiti Putra Malaysia, 43400, Selangor, Malaysia; Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400, Serdang, Selangor Darul Ehsan, Malaysia

Abstract: The gas sensing applications of multilayer graphene (MLG) films have been investigated in this study. The MLG was synthesised by chemical vapour deposition (CVD) over Co-Ni/Al2O3 substrate. The gas sensing experiment was performed by measuring resistance across the MLG film at different times while passing ammonia, hydrogen and, methane through. The MLG-based sensor was exposed to different concentrations of the gases for a period of 15 min at a fixed voltage of 1.5 V. When different gases were introduced to the test chamber at a steady flowrate, the resistance increased and reached a saturation level. The findings showed that the MLG-based sensor device was most sensitive to NH3 and H2 gases whereas it displayed least sensitivity to CH4 gas. This study has demonstrated the suitability of the MLG as a material that can be employed as a sensor device for gas sensing applications selective to NH3 and H2.

Keywords: MLG; multilayer graphene; gas sensing; CVD; chemical vapour deposition; cobalt-nickel substrate; hydrogen; ammonia; methane.

DOI: 10.1504/IJNT.2019.107362

International Journal of Nanotechnology, 2019 Vol.16 No.11/12, pp.692 - 705

Published online: 09 May 2020 *

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