Construction of MXene-Cu<sub>2</sub>O Composites and Regulation of Oxygen Vacancies

针对传统金属氧化物气体传感器工作温度高、表面活性位点不足等问题，本研究通过水热法制备了MXene-Cu2O复合材料，系统探究MXene对材料微观结构及氧空位浓度的调控作用。结合SEM、XRD、XPS及EPR等表征手段，证实MXene的引入显著提升了氧空位浓度，并构建了Cu2O立方体与MXene片层紧密复合的异质结构。实验表明，复合材料的NO2响应值达到纯Cu2O的3倍，揭示了氧空位浓度与气敏性能的正相关性。该研究为设计高性能室温气体传感器提供了新的材料设计策略，在环境监测领域具有潜在应用价值。To address the challenges of high operating temperatures and insufficient surface active sites in conventional metal oxide gas sensors, this study synthesized MXene-Cu2O composites via a hydrothermal method, systematically investigating the regulatory effects of MXene on the microstructure and oxygen vacancy concentration of the material. Through characterization techniques such as SEM, XRD, XPS, and EPR, it was demonstrated that the incorporation of MXene significantly enhanced oxygen vacancy concentration and established a tightly integrated heterostructure between Cu2O cubes and MXene nanosheets. Experimental results revealed that the NO2 sensing response of the composite material reached three times that of pure Cu2O at 0.5 ppm, highlighting a positive correlation between oxygen vacancy density and gas-sensing performance. This research provides a novel material design strategy for high-performance room-temperature gas sensors, demonstrating potential application value in environmental monitoring.