Gas sensing applications of multilayer graphene grown on Co-Ni/Al2O3 substrate by chemical vapour deposition. (9th May 2020)

• Record Type: Journal Article
• Authors: Ali, May; Ayodele, Bamidele Victor; Yasin, Faizah Md; Hamidon, Mohd Nizar; Rashid, Suraya Abdul
• Is Part Of: International journal of nanotechnology. Volume 16:Number 11/12(2019)
• Page Start: 692
• Page End: 705
• Publication Date: 2020-05-09
• Subjects: MLG -- multilayer graphene -- gas sensing -- CVD -- chemical vapour deposition -- cobalt-nickel substrate -- hydrogen -- ammonia -- methane; 620.505
• Languages: English
• ISSNs: 1475-7435

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/Al2 O3 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 .