2H-SnS2 assembled with petaloid 1T@2H-MoS2 nanosheet heterostructures for room temperature NO2 gas sensing

Abstract

In this study, we explored the gas-sensing capabilities of MoS₂ petaloid nanosheets in the metallic 1T phase with the commonly investigated semiconducting 2H phase. By synthesizing SnS₂ nanoparticles and MoS₂ petaloid nanosheets through a hydrothermal method, we achieve notable sensing performance for NO₂ gas at room temperature (27 °C). This investigation represents a novel study, and to the best of our knowledge no, prior similar investigations have been reported in the literature for 1T@2HMoS₂/SnS₂ heterostructures for room temperature NO₂ gas sensing. The formed heterostructure between SnS₂ nanoparticles and petaloid MoS₂ nanosheets exhibits synergistic effects, offering highly active sites for NO₂ gas adsorption, consequently enhancing sensor response. Our sensor demonstrated a remarkable sensing response (R_a/R_g = 7.49) towards 1 ppm of NO₂, rapid response time of 54 s, baseline recovery in 345 s, good selectivity and long-term stability, underscoring its potential for practical gas-sensing applications.