中文摘要：

独特的结构赋予了单壁碳纳米管（SWNTs）优异的电学特性，使其在纳电子器件和柔性器件领域具有广阔的应用前景．现有的合成方法尚无法实现单一导电特性的SWNTs的宏量制备，制约了其在电子器件领域的应用．为了获得单一导电性质的SWNTs，发展了多种分离方法，其中液相分离方法具有宏量分离的能力和实用化的潜力，主要包括电泳法、密度梯度离心法、管壁修饰法、凝胶色谱法和萃取法等．本文从SWNTs的结构出发，阐述各种液相分离方法的原理及适用范围，介绍高纯半导体性碳纳米管在电子器件领域的应用，并对液相分离SWNTs的发展前景及挑战进行了展望．

英文摘要：

Single-walled carbon nanotubes （SWNTs） possess unique electronic properties which make them promising materials for applications in both nano-electronics and flexible devices. Currently, no effective methods could large-scale synthesize SWNTs with single conductive properties. To obtain SWNTs with single conductive properties, a variety of separation methods have been developed. Among them, liquid phase separation approaches hold the promise for large scale production of the pure semiconducting SWNTs and have attracted intense interests. This paper summarized the mechanism and features of several liquid phase separation methods, including electrophoresis, density gradient centrifugation, chemical functionalization, gel chromatography and extraction. We also demonstrated the applications of the purified SWNTs in electronic devices. Finally, we discussed the challenges and opportunities for the separation of SWNTs.