新型石墨烯导电膜的制备及其作用机制的同步辐射研究

The electrochemical detection is considered as one of the most promising ways to achieve rapid field detection of environmental pollution. As the core of electrochemical sensors, electrode materials are of great significance. The graphene conductive films provide a new way to develop miniaturized integrated multifunctional sensors. However, there are few reports of graphene conductive films as sensing electrodes, which is mainly limited by the performance of graphene conductive films. Therefore, there is a challenge to improve the functionality and compatibility of graphene films, while retains the intrinsic structure and properties of graphene in greatest degrees simultaneously. In this proposal, a new method for synthesis of conductive polymer on graphene films by surface-initiated in-situ polymerization is proposed. High performance graphene conductive film modified with conductive polymer are prepared, through optimizing the polymerization conditions and controlling the surface properties of graphene films. Together with SEM, AFM, XRD and Raman, synchrotron radiation techniques, especially grazing incidence X-ray diffraction (GIXRD) and X-ray absorption near edge structure (XANES), are used to investigate structure, distribution and arrangement of graphene and conductive polymers in the films. The mechanism of conductive polymer modified graphene conductive films is explored at a micro level, which provides theoretical and technical foundation for the design and construction of high-performance conductive films. This proposal will promote the development and application of multi-functional integrated sensors in future.

在污染物检测方面，电化学检测被认为是一种最有潜力实现快速现场检测的方法。作为传感器的核心，电极材料的选择至关重要。石墨烯导电膜为实现多功能微型化、集成化传感提供了新途径。目前，以石墨烯导电膜为基底电极的传感研究还鲜有报道，这主要受限于石墨烯导电膜的性能。如何在最大程度地保留石墨烯本征结构和特性的情况下，进一步提高其导电性、功能性和相容性等，仍是面临的难题。本申请提出一种在石墨烯薄膜表面引发原位合成导电聚合物的新方法，通过优化聚合反应条件和调控石墨烯薄膜的表面性质，制备高性能的导电聚合物改性石墨烯导电膜。在此基础上，重点依托北京同步辐射平台，利用同步辐射GIXRD及XANES等技术，并结合其他表征手段，考察石墨烯和导电聚合物在薄膜中的结构、分布和排列等因素的影响，探索导电聚合物改性石墨烯导电膜的微观作用机制，为设计并构筑高性能导电膜奠定理论和技术基础，促进未来多功能集成传感器的开发和应用。

电化学检测被认为是一种最有潜力实现快速现场的污染物检测方法。作为传感器的核心，电极材料的选择至关重要。石墨烯导电膜为实现多功能微型化、集成化传感提供了新途径。如何在最大程度地保留石墨烯本征结构和特性的情况下，进一步提高其导电性、功能性和相容性等，仍是面临的难题。.本项目通过对石墨烯本身以及石墨烯薄膜的结构和性能的调控，制备高性能的石墨烯导电膜。在此基础上，重点依托北京同步辐射平台，利用同步辐射XANES等技术，并结合其他表征手段，考察石墨烯和导电聚合物在薄膜中的结构、分布和排列等因素，系统认识石墨烯及其薄膜状态对重金属离子电化学检测性能的影响，特别是深入了解导电聚合物对石墨烯薄膜性能的调控机制，为今后高性能导电膜的设计合成奠定了良好的实验和理论基础。