Selective separation and enrichment of semiconducting carbon nanotube using gel and dielectrophoresis and its application for sensor

碳纳米管（CNT）气体传感器因其优异的性能而受到广泛关注。然而，由于碳纳米管的手性不同，其电子性质也不同，因此碳纳米管传感器的性能并没有得到优化。本研究展示了一种利用自旋柱色谱和介质电泳（DEP）制备碳纳米管气体传感器的手性选择性方法。经过三个自旋柱后，原始碳纳米管被分离成三个部分，其中含有不同手性的碳纳米管。通过DEP将各组分中的碳纳米管捕获在微电极上，制备出三个碳纳米管气体传感器。对比这些碳纳米管气体传感器对NO2气体的响应表明，传感器的响应依赖于碳纳米管的手性，并且可以通过手性分离来改善。

Carbon nanotube (CNT) gas sensors have received considerable attention because of their outstanding properties. The CNT sensor performance, however, has not been optimized because of the coexistence of CNTs with different electronic properties depending on their chirality. This study demonstrates a chirality-selective fabrication method of the CNT gas sensor using spin-column chromatography and dielectrophoresis (DEP). After passing through three spin-columns, pristine CNTs were separated into three fractions, which contained CNTs with different chiralities. The CNTs in each fraction were trapped on the microelectrodes by DEP to fabricate three CNT gas sensors. Comparison of these CNT gas sensor responses to NO2 gas revealed that the sensor response was dependent on the CNT chirality and could be improved by the chirality separation.