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Article

Catalyst-Mediated Enhancement of Carbon Nanotube Textiles by Laser Irradiation: Nanoparticle Sweating and Bundle Alignment

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Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, UK
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School of Engineering and Materials Science, Queen Mary University London, London E1 4NS, UK
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Institute for Manufacturing, University of Cambridge, Cambridge CB3 0FS, UK
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Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
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Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Thomas Wågberg
Catalysts 2021, 11(3), 368; https://doi.org/10.3390/catal11030368
Received: 5 February 2021 / Revised: 5 March 2021 / Accepted: 8 March 2021 / Published: 11 March 2021
The photonic post-processing of suspended carbon nanotube (CNT) ribbons made by floating catalyst chemical vapor deposition (FC-CVD) results in selective sorting of the carbon nanotubes present. Defective, thermally non-conductive or unconnected CNTs are burned away, in some cases leaving behind a highly crystalline (as indicated by the Raman G:D ratio), highly conductive network. However, the improvement in crystallinity does not always occur but is dependent on sample composition. Here, we report on fundamental features, which are observed for all samples. Pulse irradiation (not only by laser but also white light camera flashes, as well as thermal processes such as Joule heating) lead to (1) the sweating-out of catalyst nanoparticles resulting in molten catalyst beads of up to several hundreds of nanometres in diameter on the textile surface and (2) a significant improvement in CNT bundle alignment. The behavior of the catalyst beads is material dependent. Here, we show the underlying mechanisms of the photonic post-treatment by modelling the macro- and microstructural changes of the CNT network and show that it is mainly the amount of residual catalyst which determines how much energy these materials can withstand before their complete decomposition. View Full-Text
Keywords: carbon nanotube/CNT; catalyst; network; textiles; photonic processing; thermal processing; alignment; microstructure carbon nanotube/CNT; catalyst; network; textiles; photonic processing; thermal processing; alignment; microstructure
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MDPI and ACS Style

Gspann, T.S.; Kaniyoor, A.; Tan, W.; Kloza, P.A.; Bulmer, J.S.; Mizen, J.; Divitini, G.; Terrones, J.; Tune, D.; Cook, J.D.; Smail, F.R.; Elliott, J.A. Catalyst-Mediated Enhancement of Carbon Nanotube Textiles by Laser Irradiation: Nanoparticle Sweating and Bundle Alignment. Catalysts 2021, 11, 368. https://doi.org/10.3390/catal11030368

AMA Style

Gspann TS, Kaniyoor A, Tan W, Kloza PA, Bulmer JS, Mizen J, Divitini G, Terrones J, Tune D, Cook JD, Smail FR, Elliott JA. Catalyst-Mediated Enhancement of Carbon Nanotube Textiles by Laser Irradiation: Nanoparticle Sweating and Bundle Alignment. Catalysts. 2021; 11(3):368. https://doi.org/10.3390/catal11030368

Chicago/Turabian Style

Gspann, Thurid S., Adarsh Kaniyoor, Wei Tan, Philipp A. Kloza, John S. Bulmer, Jennifer Mizen, Giorgio Divitini, Jeronimo Terrones, Daniel Tune, John D. Cook, Fiona R. Smail, and James A. Elliott 2021. "Catalyst-Mediated Enhancement of Carbon Nanotube Textiles by Laser Irradiation: Nanoparticle Sweating and Bundle Alignment" Catalysts 11, no. 3: 368. https://doi.org/10.3390/catal11030368

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