Issue 3, 2005
From the journal:

Journal of Materials Chemistry

Progressive and invasive functionalization of carbon nanotube sidewalls by diluted nitric acid under supercritical conditions

Ki Chul Park,ab   Takuya Hayashi,c   Hiroshi Tomiyasu,b   Morinobu Endo*a  and  Mildred S. Dresselhausd  

* Corresponding authors

a Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, Wakasato, Nagano, Japan
E-mail: mendo@endomoribu.shinshu-u.ac.jp

b Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University, Wakasato, Nagano, Japan

c General Information Processing Center, Faculty of Engineering, Shinshu University, Wakasato, Nagano, Japan

d Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Abstract

Distinctive direct sidewall functionalization of multi-wall carbon nanotubes (MWCNTs) has been carried out using dilute nitric acid (HNO3) under supercritical water (SCW) conditions. The functionalization proceeded invasively from the outer to the inner graphitic layers of the MWCNTs as the reaction progressed. The resulting nanotube-derived material was comprised of a functionalized amorphous carbon sheath and the remaining inner nanotube covered with the sheath. The functional groups induced in the sheath region included alcoholic hydroxyl groups, which endowed the nanotube-derived material with hygroscopicity. The reaction pathways for the functional group formation involved hydration and dehydration processes as well as HNO3 oxidation in the SCW medium. The results of this work have demonstrated the effectiveness of the SCW regime on the direct chemical modification of CNT sidewalls.

Graphical abstract: Progressive and invasive functionalization of carbon nanotube sidewalls by diluted nitric acid under supercritical conditions

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Article information

DOI
https://doi.org/10.1039/B411221K
Article type
Paper
Submitted
22 Jul 2004
Accepted
23 Sep 2004
First published
15 Oct 2004

J. Mater. Chem., 2005,15, 407-411

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Progressive and invasive functionalization of carbon nanotube sidewalls by diluted nitric acid under supercritical conditions

K. C. Park, T. Hayashi, H. Tomiyasu, M. Endo and M. S. Dresselhaus, J. Mater. Chem., 2005, 15, 407 DOI: 10.1039/B411221K

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