金属特性碳纳米管(8,8)的筛选分离及其超快光物理特性研究

项目名称： 金属特性碳纳米管(8,8)的筛选分离及其超快光物理特性研究

项目编号： No.61275179

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 易文辉

作者单位： 西安交通大学

项目金额： 74万元

中文摘要： 不同手性的组分彼此混杂且紧紧捆束在一起，极大妨碍单壁碳管（SWNTs）在光电子领域的应用，因此有必要对不同手性的SWNTs进行筛选分离。我们发现共轭聚合物PPE-PPV对M-tube(8,8)具有较强筛选分离作用，可以结合密度梯度超速离心工艺和PPE-PPV溶液超声-离心萃取工艺，制备富含M-tube(8,8)的SWNTs。在此基础上通过飞秒时间分辨的瞬态吸收、相干反斯托克斯拉曼散射(TR-CARS)等方法研究M-tube（8,8）的超快光物理机制，揭示M-tube(8,8)电子-声子耦合、声子-声子耦合的动力学过程，并研究PPE-PPV与M-tube(8,8)之间的pi电子相互作用。通过研究激子、载流子、声子动力学过程，一方面能揭示PPE-PPV对M-tube(8,8)筛选分离的物理机制，另一方面为研究PPE-PPV/SWNTs薄膜光学和电学性能、探索其在纳电子器件方面的应用奠定基础。

中文关键词： 碳纳米管；筛选分离；共轭聚合物；光物理性质；光热效应

英文摘要： Single-walled carbon nanotubes (SWNTs) are rolled graphite sheets along a certain vector defined by the chiral indices (n,m). The electronic structure and optical properties of individual SWNT are uniquely dependent on the chiral indices which separates the tubes into metallic and semiconducting forms. In the as-prepared sample, tubes are generally grown as a mixture of metallic and semiconducting ones, which hampers their widespread application. Selective enrichment and individualization of SWNTs play a vital role in the realization of the true potential of SWNTs in applications. Among the one third metallic species of SWNTs, the armchair SWNTs are of special interest, which is considered as "most metallic tube". π-Conjugated polymers represent an interesting class of material which can interact with SWNTs through π-π interaction. The interaction is driven by chemical or topological affinity and turns out to be selective in chirality. According to our previous studies, poly[(m-phenyleneethynylene)(PmPV) derivatives show selective interaction with SWNTs of 1.30 nm, e.g., metallic tube (12,6) with the diameter of ~1.25 nm. Along with the conformation-assisted selective wrapping, PmPV showed larger affinity to metallic tubes. After a sequence of sonication-centrifugation process, the content of metallic tubes in

英文关键词： carbon nanotubes；sorting；conjuated polymers；photophysical properties；photothermal effect