基于电子拉曼散射的单壁碳纳米管结构表征

Accurate and reliable chirality assignments are the basis of all the structural characterization of the single-walled carbon nanotubes (SWNTs), and are vital in nanotube-related science and technology, such as fundamental comprehension of chirality-dependent properties, chirality-controlled SWNT growth, as well as applications of SWNTs in nanoelectronics and bioimaging. Previously, we have proposed a solution based on the electronic Raman scattering (ERS), and have completely solved the assignment problem in metallic SWNTs. In this proposal, we plan to extend the ERS solution to semiconducting SWNTs and completely solve the assignment problem in semiconducting SWNTs. We plan to build up an one-to-one data base between the ERS features and the SWNTs with determined chirality, including both metallic and semiconducting SWNTs. We also plan to study the mechanism of the ERS process in SWNTs.

单壁碳纳米管的准确手性指认是一切结构表征的基础，对于碳纳米管结构相关的基础研究、碳纳米管的手性可控制备以及碳纳米管的各种应用，均具有直接而重要的作用。此前申请人提出了基于电子拉曼散射（ERS）的解决方案，目前已在金属性单壁碳纳米管中完全解决了准确手性指认问题，并提出了在复杂环境中准确指认单壁碳纳米管手性的双层图。本项目以此为基础，拟将基于ERS的解决方案拓展到半导体性单壁碳纳米管，实现对半导体性单壁碳纳米管的准确手性指认。通过实验数据的积累和理论模拟，获得大量ERS谱峰与各种手性单壁碳纳米管的结构匹配数据，建立ERS谱峰与单壁碳纳米管手性一一对应的数据库。本项目还拟结合理论计算，对单壁碳纳米管ERS过程的机制进行深入探讨。

单壁碳纳米管的准确手性指认是一切结构表征的基础，对于碳纳米管结构相关的基础研究、碳纳米管的手性可控制备以及碳纳米管的各种应用，均具有直接而重要的作用。项目负责人在此前提出的基于电子拉曼散射（ERS）对金属性单壁碳纳米管进行准确手性指认的基础之上，将基于ERS的方法进一步拓展到半导体性单壁碳纳米管。不仅获得了多种不同手性半导体性单壁碳纳米管的ERS光谱，更实现了对单壁碳纳米管ERS过程机制的理解，该机制对于金属性和半导体性单壁碳纳米管均适用。由于金属性碳纳米管的ERS过程来源于光激发电子被费米能级附近的低能电子-空穴对的非弹性散射， 而半导体性碳纳米管的ERS过程来源于光激发电子被该碳纳米管中存在的高能电子-空穴对的非弹性散射，两类碳纳米管的ERS过程均有助于深入理解碳纳米管的能带结构。此外，本项目还发展了基于双水相体系从同一碳纳米管分散液中直接获得多种单一手性碳纳米管溶液的方法，并建立了基于表面增强拉曼光谱对非共振碳纳米管及小分子的灵敏检测方法。

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