The possibility to synergise two-dimensional (2D) materials with 0D nanoparticles has sparked a surge in high performance futuristic electronic devices. Here, we decorated plasmonic Au nanoparticles on surface of chemical vapor deposition (CVD) grown 2D MoS<sub>2</sub> nanosheet and demonstrated bifunctional sensing behaviour within a single device. The plasmonic Au nanoparticles functionalized MoS<sub>2</sub> device showed about ~5 times higher sensitivity to NO<sub>2</sub> than that of pristine MoS<sub>2</sub> at room temperature. The enhanced gas sensing performance was attributed to a combination of Schottky barriers modulation at Au/MoS<sub>2</sub> nanointerfaces and catalytic effects upon exposing the gas analyte. In addition, the device also exhibited enhanced photoresponse with a high photo-responsivity of ~17.6 A/W and a moderate detectivity of ~<inline-formula> <tex-math notation="LaTeX">${6.6} \times {10}^{11}$ </tex-math></inline-formula> Jones due to enhanced local plasmonic effects. Finally, photons and gas molecules are detected in sequence, which proved that only a single Au-MoS<sub>2</sub> device exhibited remarkable bifunctional sensing characteristics. Such excellent bifunctional sensing ability of a single Au-MoS<sub>2</sub> device paves the way to integrate the 2D material with plasmonic nanostructures for developing an advanced multifunctional sensor.
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