摘要
The development of highly sensitive and selective gas sensors for detection of nitrogen dioxide (NO 2 ) is imperative for environmental monitoring and industrial safety. Herein, we report a novel multi-dimensional heterostructure, 1D MXene (Ti 3 C 2 T x ) nanofibers were derived from 2D MXene (Ti 3 C 2 T x ) through alkaline treatment, then integrated with 0D ZnO nanoparticles for high-performance NO 2 sensing. The unique architecture synergistically combines the high carrier mobility and abundant surface functional terminals of MXene (Ti 3 C 2 T x ) with tunable semiconducting characteristics of ZnO. Benefiting from enhanced charge transfer at the heterointerfaces and maximized active sites, optimized sensor demonstrates exceptional responses to NO 2 at room temperature, realizing a substantial response value of 64.58% towards 50 ppm NO 2 , significantly surpassing pristine MXene (Ti 3 C 2 T x ). Notably, the multi-dimensional composite exhibits an ultra-low limit of detection of 25.14 ppb for NO 2 , which meets the requirements for ppb-level detection. Additionally, the response of sensor to NO 2 (64.58%) significantly exceeds that to other interfering gases at equivalent concentrations, such as NH 3 (0.7%) and trimethylamine (7.3%). Furthermore, during long-term stability testing, the response to NO 2 at equivalent concentrations exhibited only a 4.7% decay over approximately 30 days. Density functional theory calculations reveal that the binding energy of this multi-dimensional structure for NO 2 is 0.5 eV, significantly higher than that for other gas species. Theoretical simulations reveal that improved performance originates from strengthened NO 2 adsorption energy and modulated electron depletion layers at hybrid interface. This work provides viable solution for fabricating advanced gas sensors through multi-dimensional material engineering, demonstrating great potential in real-time air quality analysis.
危险品化学品经营许可证（带存储）