Rational design of 1D/2D heterostructured ZnSnO3/ZnO/Ti3C2TX MXene nanocomposites for enhanced acetone gas sensing performance

In this paper, one-dimensional ZnSnO3/ZnO nanofibers prepared by electrospinning were attached to two-dimensional Ti3C2TX MXene sheets by electrostatic self-assembly technology to obtain 1D/2D heterostructured ZnSnO3/ZnO/Ti3C2TX MXene composites. Its chemical composition, morphology and structure were analyzed by various methods. The results show that the diameter of ZnSnO3/ZnO nanofibers is about 400 nm, and the ZnSnO3/ZnO nanofibers are cross-covered on the accordion-like MXene slices and tightly and uniformly bonded. The gas-sensing test data show that compared with ZnSnO3/ZnO samples, the response value (15.68) of the samples after MXene composite in 100 ppm acetone gas is increased by 3.5 times, and the optimal operating temperature (120 ℃) is significantly reduced. On this basis, we also discuss the mechanism of gas-sensing optimization of composite sensor. The increase of the response value and the decrease of the optimal operating temperature are mainly attributed to the increase of the specific surface area of the material, the catalytic action of MXene, and the formation of p-n heterojunction. Due to the successful construction of heterojunction and the synergistic effect between the three, the real-time and efficient detection of acetone gas is successfully realized, which provides experimental basis and theoretical support for the application of a new high-performance acetone sensor.