Controllable pore structures of pure and sub-millimeter-long carbon nanotubes

Dong Young Kim, Ji Hoon Kim, Mochen Li, Suguru Noda, Jungpil Kim, Kwang Seok Kim, Keun Soo Kim, Cheol Min Yang

Research output: Contribution to journalArticlepeer-review

Abstract

We report the controllable pore structures of pure (>99.5 wt%) and sub-millimeter-long single-walled and few-walled (triple-walled on average) carbon nanotubes (SWCNTs and FWCNTs, respectively) synthesized via fluidized-bed chemical vapor deposition. The pore structures and adsorption properties of the CNTs were characterized using N2 adsorption analysis at 77 K. A significant advantage of the synthesized vertically-aligned SWCNTs (diameter range: 2–4 nm) and FWCNTs (diameter range: 4–8 nm) arrays, having small bundle structures, is that the guest molecules can easily access the external surfaces of the CNTs, leading to high specific surface areas (SSAs; 903 and 337 m2 g−1, respectively) and pore volumes (2.56 and 2.05 mL g−1, respectively). Interestingly, following sonication, the SSAs of the SWCNTs and FWCNTs increased by 36% and 41%, respectively. Additionally, after mixed acid (HNO3/H2SO4) treatment, the SSAs of the SWCNTs and FWCNTs increased by 34% and 120%, respectively, which are attributed to the corresponding increases in the micropore and mesopore SSAs. These results suggest that CNT networks with controllable pore structures can be fabricated by altering the diameter distribution and alignment degree of the CNTs, thus highlighting the potential of our approach to develop cost-effective CNT-based structures for applications such as high-performance energy storage materials.

Original languageEnglish
Article number150751
JournalApplied Surface Science
Volume566
DOIs
Publication statusPublished - 2021 Nov 15

Keywords

  • Adsorption
  • Few-walled carbon nanotubes
  • Mesoporosity
  • Microporosity
  • Pore structure
  • Single-walled carbon nanotubes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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