石墨烯/芴-三苯胺共聚物复合纳米纤维材料的光电性能

In the present item, we attempt to prepare two-dimensional graphene nanomaterials using expanded graphite via repetitious expanding, deoxidizing and peeling. Based on our previous study, fluorene-triphenylamine copolymer containing methoxy groups can be synthesized via the Suzuki coupling reaction of triphenylamine monomer containing alkoxyl groups and 9,9-diphenylfluorene. Graphene/fluorene-triphenylamine copolymer composite nanofibers will be fabricated by the electrospinning method. The effect of the introduction of graphene on the ground and excited state structures of triphenylamine and fluorene-triphenylamine copolymer containing methoxy groups will be investigated by quantum theory methods. Calculating the transferred electric charges quantity of both, affinity energies, ionization energy and electron emission information; exploring the relationship between energy level structure and electron structure in the interface; illustrating the charge transfer mechanism of graphene and fluorene-triphenylamine copolymer in theory. The photoelectric properties of graphene/fluorene-triphenylamine copolymer composite nanofibers will be measured using XPS, femtosecond laser and fluorescence transient spectrometer. The energy level structure among various materials is optimized. The effect of the introduction of graphene on the charge carrier transmission, photoelectric conversion, electroluminescence and heat-resisting properties of the nanofibers is the key point.

本项目拟利用膨胀石墨为原料,经过多次膨胀、还原、剥离制备二维石墨烯纳米材料，且在前期工作的基础上利用含有烷氧基取代基的三苯胺单体与9,9-二苯基芴通过Suzuki偶合反应合成含甲氧基结构的芴-三苯胺聚合物；并借助高压静电纺丝技术制备石墨烯/芴-三苯胺聚合物复合纳米纤维。采用量子理论方法研究石墨烯的引入对含烷氧基结构三苯胺和芴-三苯胺聚合物的基态和激发态结构的影响规律，计算二者电荷转移数量及其亲和能、电离能和电子发射等信息，探索界面能级结构和电子结构的关系，从理论上阐明石墨烯与芴-三苯胺聚合物界面处电荷转移机制。利用X-射线光电子能谱、飞秒激光器、荧光瞬态光谱仪等测试手段研究石墨烯/芴-三苯胺聚合物复合纳米纤维材料的光电性能，优化材料间的能级结构，重点是石墨烯纳米带的引入对纳米纤维材料载流子传输、光电转换、电致发光和耐热性能等的影响规律。

项目组成员利用膨胀石墨为原料制备了二维石墨烯纳米材料， 并利用Suzuki偶合反应，通过含有烷氧基取代基的三苯胺单体与9,9-二苯基芴合了含甲氧基结构的芴-三苯胺聚合物；借助高压静电纺丝技术成功制备了石墨烯/芴-三苯胺聚合物复合纳米纤维材料。利用X-射线光电子能谱、飞秒激光器、荧光瞬态光谱仪等测试手段研究石墨烯/芴-三苯胺聚合物复合纳米纤维材料的光电性能，采用量子理论方法研究复合材料的基态和激发态结构的影响规律，计算二者电荷转移数量及其亲和能、电离能和电子发射等信息，总结了材料界面能级结构和电子结构的关系，从理论上阐明石墨烯与芴-三苯胺聚合物界面处电荷转移机制。优化了材料间的能级结构，重点是石墨烯纳米带的引入对纳米纤维材料载流子传输、光电转换、电致发光和耐热性能等的影响规律。