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Issue 29, 2014
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Selective removal of metallic single-walled carbon nanotubes by microwave-assisted treatment of SWCNTs with nitronium ions

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Abstract

A facile and rapid technique for the selective removal of metallic single-walled carbon nanotubes (M-SWCNTs) was developed by microwave-assisted treatment of SWCNTs with nitronium ions. Upon exposure to microwaves, M-SWCNTs homogeneously dispersed in organic solution were prone to react with an electron acceptor reagent, i.e., positively charged nitronium ions as compared to their counterpart, namely, semiconducting (S)-SWCNTs. The well-functionalized M-SWCNTs were separated and removed from residual S-SWCNTs by ultracentrifugation and filtration. The resulting material contained highly enriched S-SWCNTs, the proportion of which increased from approximately 62 mol% in as-received SWCNTs to nearly 90 mol%. The effectiveness in removing M-SWCNTs was confirmed by the resonant Raman spectra and UV-vis-NIR absorption spectra. The microwave-enhanced separation mechanism was discussed as well.

Graphical abstract: Selective removal of metallic single-walled carbon nanotubes by microwave-assisted treatment of SWCNTs with nitronium ions

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Publication details

The article was received on 14 Apr 2014, accepted on 16 May 2014 and first published on 11 Jun 2014


Article type: Paper
DOI: 10.1039/C4TA01816H
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 11222-11228
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    Selective removal of metallic single-walled carbon nanotubes by microwave-assisted treatment of SWCNTs with nitronium ions

    X. Shen, H. Qiu, J. Li, H. Zhang, B. Zhao and J. Yang, J. Mater. Chem. A, 2014, 2, 11222
    DOI: 10.1039/C4TA01816H

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