Controlled synthesis of N-type single-walled carbon nanotubes with 100% of quaternary nitrogen

Seungki Hong, Dong Myeong Lee, Min Park, Jae Hyung Wee, Hyeon Su Jeong, Bon Cheol Ku, Cheol Min Yang, Dong Su Lee, Mauricio Terrones, Yoong Ahm Kim, Jun Yeon Hwang

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Despite significant improvements in the synthesis of nitrogen (N)-doped carbon nanotubes (CNTs) and their versatile applications, there has always been a large difficulty in controlling the bonding configuration of N atoms within CNTs. In the current work, we report an effective chemical strategy to synthesize single-walled carbon nanotubes (SWNTs) with 100% of quaternary N via a chlorosulfonic acid(CSA) treatment. In this process, the pyridinic and pyrrolic groups were selectively and completely removed while retaining the quaternary N atoms. The presence of 2.04 at. % of quaternary N atoms within SWNTs was directly identified from a single sharp peak in the N 1s spectra of XPS, and indirectly supported by the downshift of C 1s peak in XPS, the upshift of G'-band in Raman spectroscopy, and the decrease of the work function from 5.46 to 4.59 eV. The doping effect of the quaternary N atoms on the macroscopic properties of SWNT fibers was verified by a large increase in the electrical conductivity from 0.63 to 2.17 MS/m. In perspective, our chemical approach can now be applied to synthesize carbon materials with controlled N functionalities for different applications.

Original languageEnglish (US)
Pages (from-to)881-887
Number of pages7
StatePublished - Oct 15 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)


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