Giant cationic polyelectrolytes generated via electrochemical oxidation of single-walled carbon nanotubes

Stephen A. Hodge, Mustafa K. Bayazit, Hui Huang Tay and Milo S. P. Shaffer ()
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Stephen A. Hodge: Imperial College London
Mustafa K. Bayazit: Imperial College London
Hui Huang Tay: Imperial College London
Milo S. P. Shaffer: Imperial College London

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Previously, reduced single-walled carbon nanotube anions have been used for effective processing and functionalization. Here we report individually separate and distinct (that is, discrete) single-walled carbon nanotube cations, directly generated from a pure anode using a non-aqueous electrochemical technique. Cyclic voltammetry provides evidence for the reversibility of this nanoion electrochemisty, and can be related to the complex electronic density of states of the single-walled carbon nanotubes. Fixed potentiostatic oxidation allows spontaneous dissolution of nanotube cations (‘nanotubium’); Raman spectroscopy and transmission electron microscopy show that sequential fractions are purified, separating amorphous carbon and short, defective single-walled carbon nanotubes, initially. The preparation of nanotubium, in principle, enables a new family of nucleophilic grafting reactions for single-walled carbon nanotubes, exploited here, to assemble nanotubes on amine-modified Si surfaces. Other nanoparticle polyelectrolyte cations may be anticipated.

Date: 2013
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DOI: 10.1038/ncomms2989

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