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Electron paramagnetic resonance investigation of purified catalyst-free single-walled carbon nanotubes
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Zaka, Mujtaba, Ito, Yasuhiro, Wang, Huiliang, Yan, Wenjing, Robertson, Alex, Wu, Yimin A., Rümmeli, Mark H., Staunton, David, Hashimoto, Takeshi, Morton, John J. L., Ardavan, Arzhang, Briggs, G. Andrew D. and Warner, Jamie H. (2010) Electron paramagnetic resonance investigation of purified catalyst-free single-walled carbon nanotubes. ACS Nano, 4 (12). pp. 7708-7716. doi:10.1021/nn102602a
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Official URL: http://dx.doi.org/10.1021/nn102602a
Abstract
Electron paramagnetic resonance of single-walled carbon nanotubes (SWCNTs) has been bedevilled by the presence of paramagnetic impurities. To address this, SWCNTs produced by laser ablation with a nonmagnetic PtRhRe catalyst were purified through a multiple step centrifugation process in order to remove amorphous carbon and catalyst impurities. Centrifugation of a SWCNT solution resulted in sedimentation of carbon nanotube bundles containing clusters of catalyst particles, while isolated nanotubes with reduced catalyst particle content remained in the supernatant. Further ultracentrifugation resulted in highly purified SWCNT samples with a narrow diameter distribution and almost no detectable catalyst particles. Electron paramagnetic resonance (EPR) signals were detected only for samples which contained catalyst particles, with the ultracentrifuged SWCNTs showing no EPR signal at X-band (9.4 GHz) and fields < 0.4 T.
| Item Type: | Journal Article | ||||||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Journal or Publication Title: | ACS Nano | ||||||||||
| Publisher: | American Chemical Society | ||||||||||
| ISSN: | 1936-0851 | ||||||||||
| Official Date: | 28 December 2010 | ||||||||||
| Dates: |
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| Volume: | 4 | ||||||||||
| Number: | 12 | ||||||||||
| Page Range: | pp. 7708-7716 | ||||||||||
| DOI: | 10.1021/nn102602a | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Copyright Holders: | American Chemical Society | ||||||||||
| Related URLs: |
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