声表面波高效剥离组装大面积二维MXenes材料及相关机理研究

二维MXenes以其独特的化学、光学和电学性能成为气体传感，光电探测，电池储能等领域备受关注的新兴材料。如何制备大面积二维MXenes材料是应用的关键，尤其是系统研究其制备、结构与性能的关系可为开发具有优异性能的气敏薄膜提供相应的理论依据和设计方法。本项目针对现有合成方法和气敏性能存在的局限性，基于声表面波固液耦合效应，首次提出利用声表面波对Ti3AlC2材料进行声驱剥离和组装，合成大面积Ti3C2Tx超薄气敏膜的设计理论和方法。研究拟设计声表面波微离心（SAWM）剥离与组装一体化系统，采用理论分析与实验验证相结合的方法，揭示SAWM系统对多层Ti3C2Tx液相剥离和大面积Ti3C2Tx超薄膜声驱组装的调控机理，诠释Ti3C2Tx超薄膜对硫化氢气体的敏感特性，开发高灵敏度、低检测极限的硫化氢气体传感器。研究成果将为更多二维MXenes薄膜合成与气体传感应用开发提供可靠的理论依据和实验指导。

2D MXenes are emerging in the application fields of gas sensing, optoelectronic detection, and energy storage due to their unique chemical, optical and electrical properties. One of the key challenges of the gas sensing application is to synthesize large-area MXenes ultrathin films with outstanding performance. A systematic study of the inner connection between the synthesis, film structure, and gas sensing properties is demanded to provide the theoretical guideline and design methods. We propose a novel pathway to acoustically exfoliate and then assemble the large-area Ti3C2Tx ultrathin films using surface acoustic waves (SAWs) for the first time. The method, based on the acoustic streaming effect of SAWs, will overcome the limitations of current synthesis methods and gas sensing performance. In our work, a surface acoustic wave microcentrifuge (SAWM) system will be designed, integrating the acoustic exfoliation and assembly functions to synthesize uniform Ti3C2Tx thin films for enhanced gas sensing applications. We will clarify the control mechanism of the acoustic exfoliation and assembly using SAWM, and build the inner connection between the properties of Ti3C2Tx thin films and the H2S gas sensing performance. Eventually, an ultrasensitive H2S detector with an ultralow limit of detection will be developed. The outcome of our project will provide reliable theoretical and experimental guidelines for the synthesis of other MXenes ultrathin films with high quality, and deeply influence the development of their gas sensing application.