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Issue 19, 2009
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Large-diameter and water-dispersible single-walled carbon nanotubes: synthesis, characterization and applications

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Abstract

Single-walled carbon nanotubes (SWCNTs) with large diameters (LDs) (≥3 nm) have wide applications. But, up to now, the synthesis of these novel nanostructured carbon materials is still a great challenge, and exploration of a simple synthesis method suitable for economical and large-scale production is still an important task. The present study reports on the continuous synthesis of SWCNTs with a large average diameter of 5.8 nm and a maximum diameter of 10 nm. Raman spectroscopy is used to show the first observation of peaks at low frequencies of 45–85 cm−1 associated with the observed LD-SWCNTs but the peaks at higher frequencies of 200–270 cm−1 for the small-diameter (SD) counterparts. After purification by a non-destructive approach, the present LD-SWCNTs are found to be dispersible in water, a property which will benefit many applications. This observation is in contrast to that for conventional SD-SWCNTs which cannot be dispersed in any solutions without complicated functionalization. When LD-SWCNTs are used as a catalyst support for fuel cells, they show much better performance than SD-SWCNTs, multi-walled CNTs and the commercial catalyst from Johnson Matthey Co. It is suggested that the present approach may be immediately applied for large-scale production and the applications of LD-SWCNTs in a wide range of areas such as information technology, biomedicine, and environmental and energy industries may be investigated.

Graphical abstract: Large-diameter and water-dispersible single-walled carbon nanotubes: synthesis, characterization and applications

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Publication details

The article was received on 11 Nov 2008, accepted on 09 Feb 2009 and first published on 17 Mar 2009


Article type: Paper
DOI: 10.1039/B820088B
Citation: J. Mater. Chem., 2009,19, 3033-3041
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    Large-diameter and water-dispersible single-walled carbon nanotubes: synthesis, characterization and applications

    J. Ma, J. N. Wang and X. X. Wang, J. Mater. Chem., 2009, 19, 3033
    DOI: 10.1039/B820088B

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