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Inner- and outer-wall sorting of double-walled carbon nanotubes

Li, Han and Gordeev, Georgy and Wasserroth, Sören and Chakravadhanula, Venkata Sai Kiran and Neelakandhan, Shyam Kumar Chethala and Hennrich, Frank and Jorio, Ado and Reich, Stephanie and Krupke, Ralph and Flavel, Benjamin Scott (2017):
Inner- and outer-wall sorting of double-walled carbon nanotubes.
In: Nature Nanotechnology, pp. 1176-1182, 12, (12), ISSN 1748-3387,
DOI: 10.1038/nnano.2017.207,
[Online-Edition: https://doi.org/10.1038/nnano.2017.207],
[Article]

Abstract

Double-walled carbon nanotubes (DWCNTs) consist of two coaxially aligned single-walled carbon nanotubes (SWCNTs), and previous sorting methods only achieved outer-wall electronic-type selectivity. Here, a separation technique capable of sorting DWCNTs by semiconducting (S) or metallic (M) inner- and outer-wall electronic type is presented. Electronic coupling between the inner and outer wall is used to alter the surfactant coating around each of the DWCNT types, and aqueous gel permeation is used to separate them. Aqueous methods are used to remove SWCNT species from the raw material and prepare enriched DWCNT fractions. The enriched DWCNT fractions are then transferred into either chlorobenzene or toluene using the copolymer PFO–BPy to yield the four inner@outer combinations of M@M, M@S, S@M and S@S. The high purity of the resulting fractions is verified by absorption measurements, transmission electron microscopy, atomic force microscopy, resonance Raman mapping and high-density field-effect transistor devices.

Item Type: Article
Erschienen: 2017
Creators: Li, Han and Gordeev, Georgy and Wasserroth, Sören and Chakravadhanula, Venkata Sai Kiran and Neelakandhan, Shyam Kumar Chethala and Hennrich, Frank and Jorio, Ado and Reich, Stephanie and Krupke, Ralph and Flavel, Benjamin Scott
Title: Inner- and outer-wall sorting of double-walled carbon nanotubes
Language: English
Abstract:

Double-walled carbon nanotubes (DWCNTs) consist of two coaxially aligned single-walled carbon nanotubes (SWCNTs), and previous sorting methods only achieved outer-wall electronic-type selectivity. Here, a separation technique capable of sorting DWCNTs by semiconducting (S) or metallic (M) inner- and outer-wall electronic type is presented. Electronic coupling between the inner and outer wall is used to alter the surfactant coating around each of the DWCNT types, and aqueous gel permeation is used to separate them. Aqueous methods are used to remove SWCNT species from the raw material and prepare enriched DWCNT fractions. The enriched DWCNT fractions are then transferred into either chlorobenzene or toluene using the copolymer PFO–BPy to yield the four inner@outer combinations of M@M, M@S, S@M and S@S. The high purity of the resulting fractions is verified by absorption measurements, transmission electron microscopy, atomic force microscopy, resonance Raman mapping and high-density field-effect transistor devices.

Journal or Publication Title: Nature Nanotechnology
Volume: 12
Number: 12
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 07 Feb 2018 06:43
DOI: 10.1038/nnano.2017.207
Official URL: https://doi.org/10.1038/nnano.2017.207
Funders: The authors acknowledge the experimental assistance of J. Zaumseil and S. Grimm and thank K. Moore and A. Blanch for discussions. B.S.F. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG, under grants nos. FL 834/1-1 and FL 834/2-1)., R. K. acknowledges funding by the DFG under INST 163/354-1 FUGG. R.K. and F.H. acknowledge support by the Helmholtz Association through the STN programme. G.G. and S.R. acknowledge the German Research Foundation (DFG, via SFB 658, subproject A6) and Focus, Focus Area NanoScale of the Freie Universität Berlin for financial support.
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