芘基分子钳高效、宏量分离单壁碳纳米管的研究

项目名称： 芘基分子钳高效、宏量分离单壁碳纳米管的研究

项目编号： No.21301137

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 杨逢春

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 单壁碳纳米管由金属型和半导体型单壁碳纳米管组成，金属型碳纳米管是制备纳米导线、电池电极和超级电容器的理想材料，而半导体型碳纳米管则是制备场效应晶体管等纳米半导体器件的优良材料，二者的混合会极大的影响其电学性能，限制其在电子领域的应用，对金属型和半导体型碳纳米管的分离是碳纳米管技术实用化的关键。本项目利用芳烃分子可通过非共价键力与碳纳米管相互作用的特性，以芘分子为核心，设计、合成一系列具有特殊夹角的双核分子- - - - 分子钳。这类具有特殊结构的分子钳对半导体型纳米管具有单一、定向选择性，可以从金属型和半导体型纳米管的混合物中 "挑拣"半导体型纳米管，从而实现金属型和半导体型碳纳米管高效分离的目的，并阐述分子钳对碳纳米管的分离机理。分子钳的提出开辟了芳烃分子对单壁碳纳米管定向选择的新思路，有望成为新一代高效分离剂，对碳纳米管的研究具有深远的影响。

中文关键词： 单壁碳纳米管；分子钳；分子电荷转移；能带结构；电化学性能

英文摘要： As-produced single-walled carbon nanotubes (SWNTs) are mostly metallic and semiconducting mixtures. The population of semiconducting SWNTs in the as-produced mixtures is generally much higher than that of their metallic counterparts. Therefore, post-production separation of metallic and semiconducting SWNTs is important to many potential uses of the nanotubes, especially those demanding higher electrical conductivity yet lower optical absorption. Since pyrene was known to have somewhat different interactions with metallic and semiconducting SWNTs, in this proposal a series of molecules with a pair of such a planar aromatic moieties, molecular tweezers, will be specifically designed and synthesized to exaggerate the difference in its noncovalent functionalization and solubilization of the two types of nanotubes. As demonstrated, the molecule exhibited significant selectivity toward semiconducting SWNTs in the solubilization to allow the convenient harvesting of bulk metallic and semiconducting fractions in high purities. Molecular tweezers may represent a new class of agents for more effective and also relatively simple post-production bulk separation of metallic and semiconducting SWNTs.

英文关键词： Single Walled Carbon Nanotubes；Molecular tweeze；Molecular Charge Transfer；Band Structure；Electrochemical property