Articles
  • Effect of post-annealing on single-walled carbon nanotubes synthesized by arc-discharge

  • Suyoung Parka, Sun-Woo Choib,* and Changhyun Jinc,d,*

  • aDepartment of Aviation Maintenance Engineering, Far East University, Chungbuk 27601, Republic of Korea
    bDepartment of Materials Science and Engineering, Kangwon National University, Samcheok 25913, Republic of Korea
    cDivision of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
    dThe Research Institute of Industrial Science, Hanyang University, Seoul 04763, Republic of Korea

Abstract

In this study, high-purity single-walled carbon nanotubes (SWCNTs) were prepared by removing the unreacted metal constituents and amorphous carbon impurities using a post-annealing process. Unlike conventional thermal processing techniques, this technique involved different gas atmospheres for efficient removal of impurities. A heat treatment was conducted in the presence of chlorine, oxygen, and chlorine + oxygen gases. The nanotubes demonstrated the best characteristics, when the heat treatment was conducted in the presence of a mixture of chlorine and oxygen gases. The scanning electron microscopy, transmission electron microscopy, ultraviolet absorbance, and sheet resistance measurements showed that the heat treatment process efficiently removed the unreacted metal and amorphous carbon impurities from the as-synthesized SWCNTs. The high-purity SWCNTs exhibited improved electrical conductivities. Such high-purity SWCNTs can be used in various carbon composites for improving the sensitivity of gas sensors.


Keywords: Single-walled carbon nanotubes, Heat treatment, Purity, Electrical conductivity

This Article

  • 2019; 20(4): 388-394

    Published on Aug 31, 2019

  • Received on Mar 15, 2019
  • Revised on Jul 15, 2019
  • Accepted on Jul 24, 2019

Correspondence to

  • Sun-Woo Choi b and Changhyun Jin c,d

  • bDepartment of Materials Science and Engineering, Kangwon National University, Samcheok 25913, Republic of Korea
    cDivision of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
    dThe Research Institute of Industrial Science, Hanyang University, Seoul 04763, Republic of Korea
    Tel : +82 10 8425 1636
    Fax: +82 2 2220 0389

  • E-mail: csw0427@kangwon.ac.kr and chjin0910@gmail.com