High-yield, single-step separation of metallic and semiconducting SWCNTs using block copolymers at low temperatures

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DOIResolve DOI: http://doi.org/10.1021/jp5030476
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TypeArticle
Journal titleJournal of Physical Chemistry C
ISSN1932-7447
Volume118
Issue29
Pages1615616164; # of pages: 9
SubjectCentrifugation; Acidic conditions; Carbon nanotube electronics; Density gradients; Dissolved oxygen contents; Extraction efficiencies; Semi-conducting nanotubes; Semiconducting-SWCNTs; Ultracentrifugation; Block copolymers
AbstractElectronic type separation of SWCNT material is necessary to facilitate the development of carbon nanotube electronics. A convenient, high-yield, single-step separation of metallic and semiconducting SWCNTs has been developed using block copolymers and density gradient ultracentrifugation. In particular by varying the centrifugation temperature and dissolved oxygen content under acidic conditions, extraction efficiencies of up to 65% were achieved with both metallic and semiconducting SWCNT electronic purity exceeding 99% as determined by absorption spectroscopy. It was demonstrated that lowering the temperature during the DGU separation, which is expected to increase the difference in densities between metallic and semiconducting nanotube complexes, results in higher purity and yield. Semiconducting and metallic bands are separated simply with a disposable pipet such that specialized fractioning equipment is not required for effective isolation of enriched SWCNTs.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21272875
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Record identifier39054571-4882-4f46-8273-3b86ace64065
Record created2014-12-03
Record modified2016-05-09
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