Longitudinal unzipped carbon nanotubes with high specific surface area and trimodal pore structure

Joah Han, Wonbin Kim, Hyun Kyung Kim, Hee Chang Youn, Joong Tark Han, Woong Kim, Kwang Chul Roh

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This study reports unzipped carbon nanotubes (CNTs) with a trimodal (micro-meso-macro) pore structure using KOH as the activating agent. It is possible to unzip CNTs under severe conditions (in our study, CNT (C)/KOH = 1 : 10 (w/w) at 1000 °C) in contrast to the surface activation of CNTs under general conditions (in our study, C/KOH = 1 : 4 (w/w) at 900 °C). After severe alkali activation, various pores were initially formed on the surface. Subsequently, a longitudinally unzipped structure was obtained as the individual pores connected. In contrast with other methods used to prepare unzipped and porous CNTs, this method is economical and scalable because it enables a one-step synthesis of unzipped and porous CNTs. As per the non-localized density functional theory, the distribution of micro-meso pores provides evidence of unzipping because the peak for pore sizes -1. Thus, the method is suitable for fabrication of unzipped porous CNTs, which demonstrate potential as electrode materials for ultracapacitors.

Original languageEnglish
Pages (from-to)8661-8668
Number of pages8
JournalRSC Advances
Issue number11
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

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