Gas sensing applications of multilayer graphene grown on Co-Ni/Al2O3 substrate by chemical vapour deposition Online publication date: Mon, 18-May-2020
by May Ali; Bamidele Victor Ayodele; Faizah Md Yasin; Mohd Nizar Hamidon; Suraya Abdul Rashid
International Journal of Nanotechnology (IJNT), Vol. 16, No. 11/12, 2019
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.
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