NMR investigation of n-alkylamine self-organization along the sidewalls of single-wall carbon nanotubes (SWNTs)

Ju, Sang-Yong, Utz, Marcel and Papadimitrakopoulos, Fotios (2004) NMR investigation of n-alkylamine self-organization along the sidewalls of single-wall carbon nanotubes (SWNTs). MRS Proceedings, 858. (doi:10.1557/PROC-858-HH3.18).

Abstract

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.

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Contributors

Author: Marcel Utz

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