过渡金属硫族化合物量子点的电芬顿制备技术及基于该量子点的传感平台构建

分别采用自上而下和自下而上策略,合成二维过渡金属硫族化合物纳米片层，开展电化学芬顿法(Fenton)制备羟基自由基的可控性研究，提出采用电化学芬顿技术，通过现场、可控产生的羟基自由基剪切二维过渡金属硫族化合物纳米片层制备相应金属硫族化合物量子点的新方法，研究二维过渡金属硫族化合物纳米片层剪切过程中，电化学参数、羟基自由基浓度、作用时间、环境温度对产生过渡金属硫族化合物量子点间的影响。探讨量子点的形貌、大小、结构、量子产率、光谱特性以及电化学性质。研究羟基自由基剪切二维过渡金属硫族化合物纳米片层制备相应量子点的作用机理。采用共价键功能化、非共价键功能化和化学掺杂三种主要方法对量子点表面进行修饰和改性，提高过渡金属硫族化合物量子点的化学活性、稳定性和生物相容性。利用过渡金属硫族化合物量子点及功能化过渡金属硫族化合物量子点的独特光学特性和电化学性质，构建一系列新型化学传感器。

Two-dimensional transition metal dichalcogenide nanosheets are synthesized by adopting the top-down and bottom-up strategies, respectively. The study on electrochemically induced Fenton (electro-Fenton) reaction used for efficient and controllable preparation of hydroxyl radicals is explored. A novel method for preparation of the transition metal dichalcogenide quantum dots is put forward based on etching of two-dimensional transition metal dichalcogenide nanosheets by hydroxyl radicals, which are produced in situ and controllably through the electro-Fenton technique. The effcts of electrochemical properties, concentration of hydroxyl radicals, reaction time, and temperature on the production of the transition metal dichalcogenide quantum dots are investigated in the etching process of the nanosheets. The morphology, size, structure, quantum yield, spectral characteristics and electrochemical properties of the quantum dots are explored. The mechanism of etching of two-dimensional transition metal dichalcogenide nanosheets into the quantum dots by hydroxyl radicals is dicussed. A series of routes including covalent functionalization, non covalent functionalization, and chemical doping are utilized for the modification of the quantum dots to enhance the chemical activity, stability, and biocompatibility of the transition metal dichalcogenide quantum dots. Due to their unique optical and electrochemical properties, the transition metal dichalcogenide quantum dots and functionalized quantum dots are used to the development of novel chemical sensors, which can be applied in the detections of practical samples.