Recent progress in gas sensing based on 2D SnS2 and its heterostructure platforms: A review

The surface and electronic engineering of the 2D SnS2 have recently attracted substantial courtesies in various applications due to the abundant active oxygen sites and high transport properties because of electronic modulation. Herein, we reviewed the recent signs of progress in the morphological, structural, elemental properties, and gas-detection characteristics of the two-dimensional SnS2. Furthermore, it also offers information on recent advancements and developments of various types of gas sensors prepared using the SnS2 and its heterostructures. Numerous influential gas recognition parameters have also been discussed. The gas sensing mechanisms are also discussed on NH3, NO2, H2S, and VOCs to explore the interactions of the test gas with the sensor surface, elucidating the crucial role of active surface and electronic features of SnS2 and its heterostructures on the rapid response and recovery profiles. Besides, it provides insight into the adsorption/desorption chemistry on the sensor's surface and eco-friendly environment. However, it is found that there is still vast scope for SnS2 sensors to detect several other gases, which are still not studied and reported in the literature. Therefore, it opens up a new opportunity to develop various types of gas sensors to discriminate the particular gas at optimum working temperature and concentrations. Finally, the review clinches with the future perspectives and positions of the SnS2-based gas sensors.