Molybdenum disulfide nanoparticles decorated reduced graphene oxide: highly sensitive and selective hydrogen sensor

In this work, we report on the hydrogen (H₂) sensing behavior of reduced graphene oxide (RGO)/molybdenum disulfide (MoS₂) nano particles (NPs) based composite film. The RGO/MoS₂ composite exhibited a highly enhanced H₂ response (∼15.6%) for 200 ppm at an operating temperature of 60 °C. Furthermore, the RGO/MoS₂ composite showed excellent selectivity to H₂ with respect to ammonia (NH₃) and nitric oxide (NO) which are highly reactive gas species. The composite's response to H₂ is 2.9 times higher than that of NH₃ whereas for NO it is 3.5. This highly improved H₂ sensing response and selectivity of RGO/MoS₂ at low operating temperatures were attributed to the structural integration of MoS₂ nanoparticles in the nanochannels and pores in the RGO layer.