Abstract
Rb-modified graphene powder was prepared by the chemical route synthesis method in this paper. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the composition of the crystalline phase and the morphology of the prepared gas-sensitive materials, respectively. In particular, the study focused on the sensing behaviours of Graphene-Rb-based sensor towards power transformer fault gases such as hydrogen and liquefied petroleum gas. The molar concentration (M) level of Rb additive was varied systematically from 0.5 M to 2.0 M. The highest value of sensitivity factor (SF) of ~ 200 for 1.0M Rb-modified graphene to LPG gas was obtained at considerably lower temperature of 390K and for Hydrogen gas the highest value of sensitivity factor (SF) of ~ 225 for 1.0M Rb-modified graphene at considerably lower temperature of 380K. The selectivity value is found to be maximum ~ 16 for 1.5M of Rb-modified graphene for LPG and ~ 32 for 2.0M of Rb-modified graphene for Hydrogen gas.
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