Recent advances in g-C3N4 based gas sensors for the detection of toxic and flammable gases: a review

Abstract In recent years, many 2D nanomaterials like graphene, MoS 2 , phosphorene, and metal oxide nanosheets have been investigated for gas sensing applications due to their excellent properties. Amongst other 2D nanomaterials, graphitic carbon nitride (g-C 3 N 4 ) has attracted significant attention owing to its simple synthesis process, tunable electronic properties, and exceptional physicochemical properties. Such remarkable properties assert g-C 3 N 4 as a potential candidate for the next-generation high-performance gas sensors employed in the detection of toxic and flammable gases. Although several articles and reviews are available on g-C 3 N 4 for their synthesis, functionalities, and applications for the detection of humidity. Few of them have focused their attention on gas sensing using g-C 3 N 4 . Thus, in this review, we have methodically summed up the recent advances in g-C 3 N 4 and its composites-based gas sensor for the detection of toxic and flammable gases. Moreover, we have also incorporated the synthesis strategies and the comprehensive physics of g-C 3 N 4 based gas sensors. Additionally, different approaches are presented for the enhancement of gas sensing/detecting properties of g-C 3 N 4 based gas sensors. Finally, the challenges and future scope of g-C 3 N 4 based gas sensors for real-time monitoring of gases have been discussed.