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Aqueous electromigration of single-walled carbon nanotubes and co-electromigration with copper ions / Pavan M. V. Raja; Gibran L. Esquenazi; Kourtney D. Wright; Cathren Gowenlock; Bruce E. Brinson; Shirin Alexander; Daniel Jones; Varun Shenoy Gangoli; Andrew Barron

Nanoscale, Volume: 10, Issue: 41, Pages: 19628 - 19637

Swansea University Authors: Cathren, Gowenlock, Shirin, Alexander, Daniel, Jones, Andrew, Barron

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DOI (Published version): 10.1039/C8NR06485G

Abstract

The electromigration behaviour of raw and acid purified single walled carbon nanotubes (SWCNTs) in dilute aqueous systems (0.0034 mg mL−1), in the absence of surfactant, with the addition of either 0.85 M acetic acid or 0.1 M CuSO4, was evaluated using a 2-inch copper cathode and either a 2-inch cop...

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Published in: Nanoscale
ISSN: 2040-3364 2040-3372
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa45492
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Abstract: The electromigration behaviour of raw and acid purified single walled carbon nanotubes (SWCNTs) in dilute aqueous systems (0.0034 mg mL−1), in the absence of surfactant, with the addition of either 0.85 M acetic acid or 0.1 M CuSO4, was evaluated using a 2-inch copper cathode and either a 2-inch copper or 0.5-inch platinum anode. The results showed that the electromigration of raw SWCNTs (with a high catalyst residue) in the presence of CuSO4 resulted in the formation of a Cu-SWCNT composite material at the cathode. In contrast, acid purified SWCNTs were observed to diffuse to a copper anode, creating fibrillated agglomerates with “rice-grain”-like morphologies. Upon acidification with acetic acid (or addition of CuSO4) the direction of electromigration reversed towards the cathode as a result of coordination of Cu2+ to the functional groups on the SWCNT overcoming the inherent negative charge of the acid purified SWCNTs. The result was the co-deposition of SWCNTs and Cu metal on the cathode. Addition of 0.005 M EDTA sequesters some of the Cu2+ and resulted in the separation of metal decorated SWCNTs to the cathode and un-decorated SWCNTs to the anode. The resulting SWCNT and Cu/SWCNT deposits were characterized by Raman spectroscopy, XPS, SEM, EDS, and TEM.
College: College of Engineering
Issue: 41
Start Page: 19628
End Page: 19637