Metal oxide semi-conductors are widely applied in various fields due to their low cost, easy processing, and good compatibility with microelectronic technology. In this study, ternary α-Fe2O3/TiO2/Ti3C2Tx nanocomposites were prepared via simple hydrothermal and annealing treatments. The composition, morphology, and crystal structure of the samples were studied using XPS, SEM, EDS, XRD, and multiple other testing methods. The gas-sensing measurement results suggest that the response value (34.66) of the F/M-3 sensor is 3.5 times higher than the pure α-Fe2O3 sensor (9.78) around 100 ppm acetone at 220°C, with a rapid response and recovery time (10/7 s). Furthermore, the sensors have an ultra-low detection limit (0.1 ppm acetone), excellent selectivity, and long-term stability. The improved sensitivity of the composites is mainly attributed to their excellent metal conductivity, the unique two-dimensional layered structure of Ti3C2Tx, and the heterojunction formed between the nanocomposite materials. This research paves a new route for the preparation of MXene derivatives and metal oxide nanocomposites.

中文翻译：

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用于增强型丙酮气体传感器的 α-Fe2O3/TiO2/Ti3C2TX 纳米复合材料

金属氧化物半导体因其成本低廉、易于加工、与微电子技术兼容性好而广泛应用于各个领域。在本研究中，通过简单的水热和退火处理制备了三元α-Fe2O3/TiO2/Ti3C2TX 纳米复合材料。利用XPS、SEM、EDS、XRD和多种其他测试方法研究了样品的成分、形貌和晶体结构。气敏测量结果表明，在220℃下100 ppm丙酮附近，F/M-3传感器的响应值（34.66）比纯α-Fe2O3传感器（9.78）高3.5倍，响应速度快，恢复时间（10/7 秒）。此外，该传感器还具有超低检测限（0.1 ppm 丙酮）、出色的选择性和长期稳定性。复合材料灵敏度的提高主要归功于其优异的金属导电性、Ti3C2TX独特的二维层状结构以及纳米复合材料之间形成的异质结。该研究为MXene衍生物和金属氧化物纳米复合材料的制备开辟了新途径。