2H-SnS 2 assembled with petaloid 1T@2H-MoS 2 nanosheet heterostructures for room temperature NO 2 gas sensing.

In this study, we explored the gas-sensing capabilities of MoS 2 petaloid nanosheets in the metallic 1T phase with the commonly investigated semiconducting 2H phase. By synthesizing SnS 2 nanoparticles and MoS 2 petaloid nanosheets through a hydrothermal method, we achieve notable sensing performance for NO 2 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@2HMoS 2 /SnS 2 heterostructures for room temperature NO 2 gas sensing. The formed heterostructure between SnS 2 nanoparticles and petaloid MoS 2 nanosheets exhibits synergistic effects, offering highly active sites for NO 2 gas adsorption, consequently enhancing sensor response. Our sensor demonstrated a remarkable sensing response ( R a / R g = 7.49) towards 1 ppm of NO 2 , 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.