Temperature dependent separation of metallic and semiconducting carbon nanotubes using gel agarose chromatography
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Publication Date
2015-11Journal Title
Carbon
ISSN
0008-6223
Publisher
Elsevier BV
Volume
93
Pages
574-594
Type
Article
Metadata
Show full item recordCitation
Yahya, I., Bonaccorso, F., Clowes, S., Ferrari, A., & Silva, S. (2015). Temperature dependent separation of metallic and semiconducting carbon nanotubes using gel agarose chromatography. Carbon, 93 574-594. https://doi.org/10.1016/j.carbon.2015.05.036
Abstract
Post-synthesis separation between metallic (m-SWNTs) and semiconducting
(s-SWNTs) singlewall carbon nanotubes (SWNTs) is remaining a challenging
process for the reliable fabrication of high performance electronic devices.
Gel agarose chromatography is emerging as an efficient and large scale
separation technique. However, the full (100%) separation of m-SWNTs and
s-SWNTs has not been reached yet, mainly due to the lack of understanding of
the separation mechanism. Here we study the temperature effect on the
separation via gel agarose chromatography by varying the separation process
temperatures between 6C and 50C, for four different SWNT sources. Exploiting
the gel agarose micro-beads filtration technique we achieved up to 70% m-SWNTs
and more than 90% s-SWNTs, independent of the source material. The process is
temperature dependent, with improved yields up to 95% for s-SWNT (HiPco) at 6C.
Temperature affects the sodium dodecyl sulfate SDS surfactant-micelle
distribution along the SWNT sidewalls, thus helping to act as an aid in the
sorting of SWNTs by electronic type. The sorted SWNTs are then used to
fabricate transistors with very low OFF-currents (10^-13 A), high ON/OFF
current ratio (>10^6) and improved charge carriers mobility.
Sponsorship
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission (604391)
Engineering and Physical Sciences Research Council (EP/L016087/1)
Identifiers
External DOI: https://doi.org/10.1016/j.carbon.2015.05.036
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283420
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