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.
Competing Interests: The authors declare no conflict of interest.
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