通过在不同直径的多壁碳纳米管表面拥挤接枝共轭聚合物实现的精细调节共轭聚合物的光吸收

项目名称： 通过在不同直径的多壁碳纳米管表面拥挤接枝共轭聚合物实现的精细调节共轭聚合物的光吸收

项目编号： No.21274158

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 耿建新

作者单位： 中国科学院理化技术研究所

项目金额： 80万元

中文摘要： 在基底表面拥挤接枝时，共轭聚合物链采取平面伸展构象，光吸收发生显著红移（JACS 2009, 131, 16445）。本项目采用表面引发的Kumada催化剂转移缩聚（KCTP）法在以直径分级的多壁碳纳米管（MWNTs，直径从约5 nm到大于50 nm梯度变化）表面接枝共轭聚合物的途径，达到精细调节共轭聚合物的光吸收的目的。通过优化MWNTs的表面修饰方法，得到在MWNTs表面上高效固载KCTP引发剂的途径，使得接枝在MWNTs表面上的共轭聚合物链表现出拥挤现象。随MWNTs直径的增加，聚合物链的拥挤程度增加，聚合物链逐步采取平面伸展构象，从而达到精细调节共轭聚合物光吸收的目的。通过对刷子的结构、MWNT/共轭聚合物复合物性质的表征，建立刷子的结构和复合物性能之间的关系。为这种电子给体－受体材料在聚合物光伏领域的应用提供实验数据和理论依据。本项目提出了精细调节共轭聚合物光吸收的新思路。

中文关键词： 多壁碳纳米管；聚（3-己基噻吩）；表面引发的KCTP；电荷分离；光响应

英文摘要： When crowdedly grafted on the surfaces of substrates, conjugated polymers show red-shifted optical absorption due to the planarization of the conjugated backbones (JACS 2009, 131, 16445). The specific aim of this project is to finely tune the optical absorption of conjugated polymers by grafting the conjugated polymers on the surfaces of multiple-walled carbon nanotubes (MWNTs) that are classified according to their diameters (a group of MWNT samples with diameter ranging from ca. 5 nm to more than 50 nm) via surface-initiated Kumada catatyst transfer polycondensation (KCTP). Initiators for surface-initiated KCTP will be immobilized on the surfaces of MWNTs at a maximum surface density by optimizing the immobilizing approach so that the conjugated polymers can be crowdedly grafted on the surfaces of MWNTs. The crowding of the grafted conjugated polymers becomes more serious as the diameter of the MWNTs increases. In this process, the backbones of the conjugated polymers will exist in gradually enhanced planar conformations; as a result, the optical absorption of the conjugated polymers are finely tuned. We aim to find the relationship between the structures of the grafted brushes of the conjugated polymers and the properties of the MWNT/conjugated polymer composites after systematic characterization. We expect t

英文关键词： MWNTs；Poly(3-hexylthiophene)；Surface-initiated KCTP；Charge separation；Photoresponse