Strategies for enhancing room temperature gas sensing performance of stand-alone transition metal dichalcogenides

Although the development of industry has significantly improved the living standards of human beings, it has also inevitably caused serious pollution of the atmosphere, which has greatly aroused concern about gas detection technology. In recent years, two-dimensional transition metal dichalcogenides (TMDs) have attracted great attention in the field of air sensing due to their excellent adsorption ability for harmful gases at room temperature. However, their inherent performance deficiencies have caused problems with weak sensor responsiveness and long response/recovery times. Research targeting the performance tuning of stand-alone system TMDs is necessary to radically improve the performance of sensors. This review summarizes a series of strategies that researchers have adopted in recent years to improve the performance of stand-alone TMDs materials. Firstly, the application of TMDs materials in gas sensors is described. Then, the methods and mechanisms for enhancing the gas sensing performance of stand-alone TMDs through different strategies are highlighted. Finally, the future development of TMDs gas sensors is summarized and projected.