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Aqueous electromigration of single-walled carbon nanotubes and co-electromigration with copper ions

Abstract

The electromigration behaviour of raw and acid purified single walled carbon nanotubes (SWCNTs) in dilute aqueous systems (0.0034 mg/ml), in the absence of surfactant, with the addition of either 0.85M acetic acid or 0.1M 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 0.005M 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.

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Publication details

The article was received on 11 Aug 2018, accepted on 01 Oct 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR06485G
Citation: Nanoscale, 2018, Accepted Manuscript
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    Aqueous electromigration of single-walled carbon nanotubes and co-electromigration with copper ions

    P. M. V. Raja, G. Esquenazi, K. D. Wright, C. E. Gowenlock, B. E. Brinson, S. Soleimani, D. R. Jones, V. Shenoy Gangoli and A. R. Barron, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR06485G

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