Stabilizing MoS 2 Nanosheets through SnO 2 Nanocrystal Decoration for High‐Performance Gas Sensing in Air

The unique properties of MoS 2 nanosheets make them a promising candidate for high‐performance room temperature sensing. However, the properties of pristine MoS 2 nanosheets are strongly influenced by the significant adsorption of oxygen in an air environment, which leads to instability of the MoS 2 sensing device, and all sensing results on MoS 2 reported to date were exclusively obtained in an inert atmosphere. This significantly limits the practical sensor application of MoS 2 in an air environment. Herein, a novel nanohybrid of SnO 2 nanocrystal (NC)‐decorated crumpled MoS 2 nanosheet (MoS 2 /SnO 2 ) and its exciting air‐stable property for room temperature sensing of NO 2 are reported. Interestingly, the SnO 2 NCs serve as strong p‐type dopants for MoS 2 , leading to p‐type channels in the MoS 2 nanosheets. The SnO 2 NCs also significantly enhance the stability of MoS 2 nanosheets in dry air. As a result, unlike other MoS 2 sensors operated in an inert gas (e.g. N 2 ), the nanohybrids exhibit high sensitivity, excellent selectivity, and repeatability to NO 2 under a practical dry air environment. This work suggests that NC decoration significantly tunes the properties of MoS 2 nanosheets for various applications.