二维MXenes/TMDs纳米异质结构传感器的光电气敏耦合机理研究

传感材料和传感机制的创新对提升气敏性能并拓展传感功能具有重要的科学意义。二维(2D)过渡金属碳氮化合物(MXenes)兼具优异导电性和丰富表面官能团可在室温下检测挥发性有机化合物(VOCs)，但尚缺乏对复合体系组分性质的充分挖掘和界面调控机制的系统研究。微型发光二极管和芯片封装技术的发展推动了光辅助化学传感器的集成，本项目拟结合优异气敏光敏材料过渡金属硫化物(TMDs)，构筑2D/2D MXenes/TMDs纳米异质结构，精确调控组分的几何构型和分布，辅助以可见光激发，结合采集电路及无线传输装置，实现疾病检测呼吸气体传感器的初步开发。针对材料结构与性能间构效关系不清晰、光激发下增敏微观机理模糊等科学问题，结合电化学分析、原位表征及理论计算重点研究光激发下纳米异质结构协同效应中涉及的电子化学效应及对性能改善的具体作用方式，为构筑疾病检测的高效VOCs室温传感器提供研究思路和理论支撑。

Two-dimensional transition metal carbonitrides (MXenes) materials with metal conductivity and abundant surface functional groups are ideal candidates for the building blocks of room-temperature gas sensors, especially for the detection of volatile organic compounds (VOCs). However, it is still lacking of systematic researches on the individual component functions and interface engineering mechanisms of the heterostructures. The development of miniature light-emitting diodes and chip packaging technology promotes the integration of light-assisted chemical sensors. Combined with the optoelectronic gas-sensitive materials transition metal dichalcogenides (TMDs), this research designs of 2D/2D MXene/TMD heterostructure based gas sensors for the medical diagnosis, by regulating the geometric configuration and distribution, assisting with visible light illumination, and the use of circuits and wireless transmission devices. The key scientific issues include the structure-property relationships of sensitive materials and the light-excited sensitization sensing mechanisms. The electrochemical analysis, in-situ characterizations, and theoretical calculations are utilized to explore the electronic and chemical effects involved in the synergistic effects of heterostructures under visible light illumination, which provides not only research perspectives but also theoretical supports for the construction of the highly efficient VOC sensors for disease diagnosis.