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

Title
Controllable pore structures of pure and sub-millimeter-long carbon nanotubes
Authors
양철민김지훈Mochen LiSuguru NodaDong Young KimJungpil KimKwang-Seok KimKeun Soo Kim
Keywords
Single-walled carbon nanotubes; Few-walled carbon nanotubes; Adsorption; Pore structure; Microporosity; Mesoporosity
Issue Date
2021-11
Publisher
Applied surface science
Citation
VOL 566, 150751
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.
URI
http://pubs.kist.re.kr/handle/201004/73530
ISSN
0169-4332
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KIST Publication > Article
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