Kim, Dong Young Kim, Ji Hoon Li, Mochen Noda, Suguru Kim, Jungpil Kim, Kwang-Seok Kim, Keun Soo Yang, Cheol-Min 2024-01-19T13:30:45Z 2024-01-19T13:30:45Z 2021-10-21 2021-11-15 0169-4332 https://pubs.kist.re.kr/handle/201004/116134 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 N-2 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 m(2) 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. English ELSEVIER FLUIDIZED-BED SURFACE-AREA POSITIVE ELECTRODES HYDROGEN STORAGE ACTIVATED CARBON HIGH-PERFORMANCE SINGLE METHANE CATALYST GROWTH Controllable pore structures of pure and sub-millimeter-long carbon nanotubes Article 10.1016/j.apsusc.2021.150751 1 APPLIED SURFACE SCIENCE, v.566 APPLIED SURFACE SCIENCE 566 scie scopus 000691188100002 2-s2.0-85111330013 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article FLUIDIZED-BED SURFACE-AREA POSITIVE ELECTRODES HYDROGEN STORAGE ACTIVATED CARBON HIGH-PERFORMANCE SINGLE METHANE CATALYST GROWTH Single-walled carbon nanotubes Few-walled carbon nanotubes Adsorption Pore structure Microporosity Mesoporosity