Single-Walled Carbon Nanotube Network with Bimodal Pore Structures of Uniform Microporosity and Mesoporosity

Authors: Yang, Cheol-Min; Kim, Dong Young; Lee, Young Hee

Source: Journal of Nanoscience and Nanotechnology, Volume 5, Number 6, June 2005 , pp. 970-974(5)

Publisher: American Scientific Publishers

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Abstract:

We characterized single-walled carbon nanotubes before and after HNO3/H2SO4 treatments for different times by scanning electron microscopy, Raman spectroscopy, and N2 adsorption at 77 K. Single-walled carbon nanotube assembly revealed a bimodal pore structure of microporosity (surface area of 476 m2 g−1) and mesoporosity (surface area of 476 m2 g−1) with a high total surface area of 1048 m2 g−1. The microporosity increased prominently after HNO3/H2SO4 treatments, whereas the mesoporosity decreased progressively with the treatment time. The HNO3/H2SO4 treatment of nanotubes induced an aggregation and alignment that should transform larger mesopores of nanotube assemblies into smaller ones, and smaller mesopores into micropores, resulting in the decrease of external surface area. This effect was attributed to the presence of abundant defects on the tube wall that were saturated by functional groups during the acid treatment of the single-walled carbon nanotubes.

Keywords: NANOPOROUS CARBON; NITROGEN ADSORPTION; PORE STRUCTURE; SINGLE-WALLED CARBON NANOTUBE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2005.134

Publication date: June 1, 2005

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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