Abstract
Structural separation of single-wall carbon nanotubes (SWCNTs) is crucial for high-performance SWCNT-based devices. Compared with separation methods in aqueous systems, SWCNTs separated via polymer wrapping are more conducive to being processed into uniform and well-oriented films for high-speed nanoelectronic devices. However, high-purity separation of multiple single-chirality SWCNTs in organic systems remains a challenge due to the limited chiral resolution of polymer-based methods. Herein, we develop a straightforward technique to enlarge the polymer coating differences of different SWCNT species by employing ethanol and precisely recognize the various (n, m) species by introducing undispersed SWCNTs to induce a spontaneous chiral selective reaggregation. With this technique, we obtained eight types of single-chirality SWCNTs in organic systems, including (6, 5), (7, 5), (7, 6), (8, 6), (8, 7), (9, 7), (10, 5) and (10, 6), with purities higher than 90% in five of them. Ethanol also induces the reaggregation of metallic SWCNTs, increasing the purity of large-diameter semiconducting SWCNTs. This technique makes significant progress in the polymer-based method for achieving single-chirality separation. We believe that this work promotes the SWCNT-based electronics.