琼脂糖凝胶电泳法分离金属性和半导体性单壁碳纳米管

摘要

The agarose gel electrophoresis (AGE) is one of the low-cost, large scale technologies for the separation of metallic single-walled carbon nanotubes (m-SWCNTs) and semiconducting single-walled carbon nanotubes(s-SWCNTs). The separated m-SWCNTs are divided into several parts and characterized by the UV-visible-near infrared absorption spectrum and the Raman spectrum respectively. The results show that the moieties with the fastest electrophoresis migration rate contain more m-SWCNTs. Furthermore, the effects of different agarose concentrations on the separating efficiencies of SWCNTs are investigated. It is found that higher concentration of agarose gel is beneficial to the enrichment of the m-SWCNTs and the separating efficiency of the m-SWCNTs could be realized by increasing the charge density on the surface of the SWCNTs.%琼脂糖凝胶电泳(AGE)是实现金属性单壁碳纳米管(m-SWCNTs)和半导体性单壁碳纳米管(s-SWCNTs)低成本、规模化分离的有效技术之一.本研究利用琼脂糖凝胶电泳分离单壁碳纳米管.通过紫外-可见-近红外吸收光谱和拉曼光谱对色谱带进行分段表征,发现电泳中迁移的最快的部分m-SWCNTs含量最高.考察了琼脂糖的浓度对SWCNTs中m-SWCNTs分离的影响.结果表明:高的琼脂糖浓度有利于m-SWCNTs的富集,可以通过扩大电荷密度带来的迁移速率的差异来使SWCNTs中的m-SWCNTs得到更有效的分离.