一维/二维单层卟啉共价网格材料的可控合成、表征及光电性质研究

Two-dimensional organic covalently network is a class of two-dimensional materials as graphene structures. It is widely concerned for excellent properties with high electron mobility, excellent mechanical performance , good electric conductivity and catalysis. Porphyrin has excellent photoelectric conversion properties, which is good monomer candidate for organic covalently network. However, it is difficult to synthesis monolayer large covalently network materials with defect free. Therefore, large covalently network materials will be synthesized through surface reaction such as coordination or condensation by using scanning tunneling microscopy (STM) technique. We will focus on next subjects as follow. Firstly, one and two dimensional porphyrin monolayer would be designed and synthesized. Secondly, one and two dimensional porphyrin organic covalently network have been fabricated by surface reaction methods. Finally, these organic covalently networks are observed by STM. On this basis, it will be recognized for the mechanism of fabricating organic covalently networks. The results will reveal the relation between element structures and properties of two-component nanostructures of porphyrin-fullerene will be formed and modulated by porphyrin compound as template. From this research, it reveals the relation between structure and properties.It will provide scientific evidence for designing and preparing single electron device.

二维共价有机网格材料是一类具有类石墨烯结构的二维材料，以其优异的力学性能、高电子迁移率、催化等特点引起人们的广泛关注。卟啉具有优良的光电转换性质，是二维共价有机网格材料的理想单体。由于在溶液中很难合成无缺陷、面积大的单层共价网格结构。本研究将以STM为手段，通过配位、缩聚等表面反应的方法构筑有序可控的一维/二维单层卟啉共价有机网格结构，并集中从以下几个方面进行研究：（1）设计、合成一维/二维卟啉网格单体分子；（2）利用表面反应的方法构筑一维/二维单层卟啉共价网格结构；（3）利用STM技术观察卟啉共价网格结构，认识表面构筑共价网格结构的规律，揭示卟啉单体分子结构与共价网格结构的关系，为单层电子器件研究提供实验基础。

本项目以扫描隧道显微镜（STM）为主要表征手段，以高定向热解石墨（HOPG）为反应基底，系统研究了一维/二维卟啉类共价有机网格分子的制备、组装结构及其光电性质。 我们设计、合成了一系列二维卟啉类网格结构，并利用STM技术观察到了该类分子在庚酸/石墨界面的二维自组装网络，认识了表面构筑共价网格结构的规律，为制备高质量、结构有序的二维纳米材料提供了实验依据。另外，通过加入联吡啶等单体分子，成功实现了对整个组装结构的调控，并通过了密度泛函理论计算，揭示了不同二维网格组装结构的形成机制和调控过程，为制备新型二维纳米分子器件提供了科学依据。