Preparation and gas sensing properties of ZnO/MXene composite nanomaterials

In this paper, ZnO/Ti 3 C 2 T x composites containing different proportions of Ti 3 C 2 T x were synthesized by hydrothermal method. The effects of different proportions of MXene content on the gas sensing properties of ZnO/Ti 3 C 2 T x composites were studied. It is found that ZnO/Ti 3 C 2 T x composites show a good response to acetone and excellent reversibility and the ZnO/Ti 3 C 2 T x composites containing 2 wt% Ti 3 C 2 T x had the highest response to acetone. The gas-sensing performance of ZnO/multi-layer MXene and ZnO/few-layer MXene were compared. The results showed that ZnO/Ti 3 C 2 T x composites with few-layer MXene had a higher response to acetone, 14.4, indicating that the few-layer MXene solution has better dispersion for ZnO and gas-sensing properties. Finally, the gas sensing mechanism of few-layer MXene/ZnO was suggest. • ZnO/Ti 3 C 2 T x material was prepared by controllable hydrothermal method, and ZnO was uniformly dispersed on MXene. • ZnO/Ti 3 C 2 T x composites with few-layer MXene had a higher response to acetone owing to its better dispersion and synergistic effect. • The gas sensing mechanism of few-layer MXene/ZnO was suggest.