Gas-sensitive performance of metal-organic framework-derived CuO NPs/Ti3C2TX MXene heterostructures for efficient NO2 detection at room temperature

In this paper, MOFs-derived transition metal oxides (CuO NPs) were prepared by hydrothermal method combined with the stirring aging method using MOFs as sacrificial templates to realize the growth of CuO NPs octahedra on Ti3C2TX MXene nanosheets. Due to the synthesized binary heterostructured CuO NPs/Ti3C2TX MXene materials retain the unique MOFs structures, have abundant heterojunction interface, and owns the advantages of MOFs, such as large specific surface area, abundant active sites, high porosity, and effective oxidative chemical adsorption, the composite sensor shows very significant gas sensing capabilities for NO2 gas with a gas-sensitive response and response time of 38.54 and 2.84 s, respectively, for 100 ppm NO2 gas at RT. It achieves an impressively low detection limit of 30 ppb, maintaining stability for up to 10 weeks. This positions it as a highly sensitive NO2 gas sensor with potential for room-temperature applications.