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Volume 173, 2014
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Spinning of carbon nanotube fibres using the floating catalyst high temperature route: purity issues and the critical role of sulphur

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Abstract

The CVD process for the spinning of carbon nanotube (CNT) fibres combines the nucleation, growth and aggregation of CNTs in the form of an aerogel with fibre spinning into a single process step. The optimisation of the process requires agility in multi-dimensional parameter space, so one tends to find parameter ‘islands’ where spinning is possible, while exploration tends to follow ‘routes’ through this space. Here, we follow two such routes, one of which drastically improves fibre purity, the other changes the nature of the nanotubes comprising the fibres from multiwall to single wall. In the first case there is only a modest enhancement of the mechanical properties, but in the second a very considerable improvement is seen. In terms of the conditions required to make fibres comprising predominately single wall CNTs, the key factor appears to be the rigorous control of the sulphur addition, in trace quantities, coupled with the availability of carbon atoms at the earliest stage after injection, typically in the range 400–500 °C. A model is presented for the role of sulphur in floating catalysts CNT synthesis.

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Publication details

The article was received on 11 Apr 2014, accepted on 20 May 2014 and first published on 21 May 2014


Article type: Paper
DOI: 10.1039/C4FD00066H
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Citation: Faraday Discuss., 2014,173, 47-65

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    Spinning of carbon nanotube fibres using the floating catalyst high temperature route: purity issues and the critical role of sulphur

    T. S. Gspann, F. R. Smail and A. H. Windle, Faraday Discuss., 2014, 173, 47
    DOI: 10.1039/C4FD00066H

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