SnS/MXene derived TiO hybrid for ultra-fast room temperature NO gas sensing

Nitrogen dioxide (NO 2 ) is a prominent air pollutant that is harmful to both the environment and human health. Conventional NO 2 sensors that are designed to operate at room temperature often come with severe performance compromises, especially in dynamic performance. This paper presents a new method for achieving ultra-fast NO 2 gas sensing and recovery dynamics using a nanohybrid of SnS 2 and MXene derived TiO 2 . With its unique 2D structure, MXene derived TiO 2 provides a unique platform on which SnS 2 can be decorated, forming heterojunctions as well as significantly enlarged surface area, both contributing to enhanced gas sensing properties. At room temperature operation, the fabricated nanohybrid based sensor exhibits a large response of 115 toward 1000 ppm NO 2 gas and an ultra-fast recovery of 10 s. This level of dynamic performance is unprecedented, rendering fast room temperature gas sensing a practical reality. MXene derived TiO 2 provides a unique platform on which SnS 2 can be decorated, achieving heterojunctions and significantly enlarged surface area, both contributing to enhanced gas sensing.