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• Ag 2 S-Graphene based hybrid nanostructure showed remarkable hydrogen sensing performance at room temperature. • The microwave assisted hydrothermal synthesis approach provides highly scalable Ag 2 S-Graphene based hybrid nanostructure. • The Ag 2 S-Graphene based hybrid sensor proved better sensing response of 45.5% at room temperature. Herein, we aimed to synthesize an efficient room-temperature gas sensor using biomass-derived graphene nanosheets-Ag 2 S based hybrid nanostructure by a microwave-assisted hydrothermal method. The electron micrographs of the synthesized Ag 2 S-GNS nanostructure depicts rice-shaped Ag 2 S nanoparticles impregnated onto graphene surfaces. Interestingly, the bandgap of Ag 2 S and Ag 2 S-GNS based hybrid nanostructures were identified to be 2.04 eV and 1.75 eV, respectively. The Ag 2 S-GNS based hybrid nanostructure showed better hydrogen sensing efficiency than the pure Ag 2 S nanoparticles. The maximum response of 45.5 % for 150 ppm exposure of hydrogen gas was obtained for Ag 2 S-GNS based hybrid nanostructure at room temperature. The sensing response and recovery of Ag 2 S-GNS hybrid nanostructures towards hydrogen gas were found to be 19 sec and 31 sec, respectively. The high gas sensitivity and fast response time of the hybrid sensor were due to assorted attributes and synergetic effect between Ag 2 S and GNS hybrids. [ABSTRACT FROM AUTHOR]