MXene combining with metal oxide semiconductor (MOS) can improve carrier transfer rate, inhibit agglomeration, and promote the improvement of gas-sensing performance. In this article, the heterogeneous composites of α-Fe₂O₃ and Ti₃C₂T_x MXene were successfully synthesized through a facile hydrothermal route, and characterized the morphology and microstructure by various characterizations. The results revealed that the α-Fe₂O₃ nanocubes with sizes of around 250 nm in width were prepared and uniformly distributed to the surface of the Ti₃C₂T_x MXene nanosheet. Gas-sensing test results illustrated that the α-Fe₂O₃/Ti₃C₂T_x MXene composites-based sensor exhibited outstanding selectivity to acetone compared with other typical gases, and illustrated a high response (16.6% to 5 ppm acetone), the fast response and recovery speeds (5/5 s), superb linearity and prominent repeatability at room temperature (RT). Furthermore, the gas-sensing mechanism of the α-Fe₂O₃/Ti₃C₂T_x MXene sensor toward acetone is discussed by density functional theory (DFT) calculation. This work is expected to provide useful reference to develop other promising hybrids for acetone sensing at RT.

MXene与金属氧化物半导体（MOS）结合可以提高载流子传输速率，抑制团聚，促进气敏性能的提高。在本文中，α-Fe ₂ O ₃和Ti ₃ C ₂ T _x MXene的异质复合材料通过简便的水热途径成功合成，并通过各种表征对其形貌和微观结构进行了表征。结果表明，制备出宽度约为 250 nm的 α-Fe ₂ O ₃纳米立方体并均匀分布在 Ti ₃ C ₂ T _x表面。MXene 纳米片。气敏测试结果表明，与其他典型气体相比，基于α-Fe ₂ O ₃ /Ti ₃ C ₂ T _x MXene 复合材料的传感器对丙酮表现出出色的选择性，并显示出高响应（16.6% 至 5 ppm 丙酮） 、快速的响应和恢复速度（5/5 秒）、出色的线性和室温 (RT) 下突出的可重复性。此外，α-Fe ₂ O ₃ /Ti ₃ C ₂ T _x的气敏机制通过密度泛函理论 (DFT) 计算讨论了面向丙酮的 MXene 传感器。这项工作有望为开发其他有前景的室温丙酮传感混合体提供有用的参考。