表面金属-有机二维纳米结构的构筑与性质研究

Currently, increasing efforts are devoted to the construction of two dimensional (2D) metal organic nanosheets with metal active sites and 2D extended π–d conjugated systems, which potentially exhibit specific catalytic or optical–electric properties. In addition, metal organic 2D materials possess great diversities in topological structures and physical and chemical properties benefiting from the abundance of building blocks, which would facilitate the demanding material design. However, it still remains great challenge to obtain novel uniform ultrathin 2D metal organic nanosheets with various topologies so far. The project aims to investigate new strategies to obtain high quality 2D metal organic nanosheets on surface. The main contents include: (1) study the formation of 2D metal organic nanostructure on surface, understand the relationship between the molecular packing at the interface and the molecule-molecule, molecule-metal and molecule-surface interactions; (2) develop new strategies to construct high quality 2D metal organic nanosheets on surface guided by molecular assembling rule; (3) construct 2D metal organic nanosheets with diverse structures and explore their catalytic or optical–electric properties.

金属-有机二维纳米结构具有π–d 共轭体系、金属活性中心、结构可裁剪性等特点，在电学、催化等领域都有着重要的潜在应用价值。然而，目前高质量、层数可控的金属-有机二维纳米结构的制备及其界面结构调控的研究尚为欠缺。针对这一问题，本项目拟采用基底为模板，研究高质量金属-有机二维纳米结构的制备和界面调控的方法，主要内容包括：（1）研究表面金属-有机二维纳米结构组装过程的一般规律；（2）以其组装规律为指导，发展高质量金属-有机二维纳米结构的制备方法；（3）实现金属-有机二维纳米结构在表面可设计、可调控，并探究金属-有机二维纳米材料的电学、催化等性能。

本项目主要是采用了两种自下而上方法制备金属-有机二维纳米结构材料，并对其电催化性能进行研究。具体研究工作主要为：（1）采用了微型水热反应器和液/液/固三相体系两种方法限域合成金属-有机二维纳米结构材料；（2）使用扫描隧道显微镜或二维同步辐射掠入射广角X射线散射等技术表征其组装结构；（3）对其析氧或氧还原性能进行研究，所制备的材料性能与商业催化剂相当。本项目研究结果为自下而上设计和制备含新型活性位点的金属-有机二维纳米结构催化剂提供了新思路。