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NMR Investigation of n-Alkylamine Self-Organization Along the Sidewalls of Single-Wall Carbon Nanotubes (SWNTs)

Published online by Cambridge University Press:  01 February 2011

Sang-Yong Ju ,
Marcel Utz  and
Fotios Papadimitrakopoulos
Sang-Yong Ju
Affiliation:
Institute of Materials Science, University of Connecticut
Marcel Utz
Affiliation:
Institute of Materials Science, University of Connecticut Department of Physics, University of Connecticut
Fotios Papadimitrakopoulos
Affiliation:
Institute of Materials Science, University of Connecticut Department of Chemistry, University of Connecticut
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Single wall carbon nanotubes (SWNTs) have drawn considerable attention from the scientific community based on their potentially unique 1-D electronic and optical properties as well as mechanical properties. These characteristics result from the one dimensional quantum wire structure of CNTs, which have the spike-like van Hove singularities (vHs) in the electronic density of states. The detailed shape of the density of states function depends sensitively on CNT type semiconducting (sem-) versus metallic (met-)), diameter and chirality. Using the preferential affinity of amines towards sem -SWNTs, our group has been able to attain bulk separation by type based on a differential solubility of SWNTs according to the amine organization interaction on the nanotube surface. It has been argued that stable dispersions of sem -SWNTs with surfactant-amines originate from the organization of the aliphatic chain along the nanotube sidewalls, along with a small amount of zwitterions. The separation of sem-enriched SWNTs assisted by octadecylamine (ODA) had been depicted in the form of either small amount of zwitterionic interaction between carboxylic acid groups of acid-purified SWNTs or the physisorption on the SWNTs sidewall, leaving met -SWNTs in the precipitate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 858: Symposium HH – Functional Carbon Nanotubes , 2004 , HH3.18
Copyright
Copyright © Materials Research Society 2005

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References

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