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Interaction between fluorene-based polymers and carbon nanotubes/carbon nanotube field-effect transistors

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5 Author(s)
Lain-Jong Li ; School of Materials Science and Engineering Nanyang Technological University 50, Nanyang Ave. Singapore, 639798 ; Fuming Chen ; Yumeng Shi ; Keke Zhang
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We study the interaction between fluorene-based conjugating polymers and various chiralities of single-walled carbon nanotubes (SWNTs). The fluorene-based polymers are able to selectively wrap the SWNTs with certain chiral angles or diameters (1.02~1.06 nm) depending on their chemical structures. This can be used to selectively extract or enrich certain species of nanotubes. For example, high purity of (7, 5) SWNTs (~79% of the semiconducting ensemble) can be obtained by fluorine-polymer assisted extraction from the narrow-diameter distributed SWNTs produced by the catalyst Co-MCM-41. In addition, we also study the interaction between fluorene-based polymers and SWNT networked field-effect transistors (SNFETs) by location-selective photo-excitation, where we find that the photocurrent generated in SNFETs is controlled by the energy-level alignment at the polymer-electrode interface and the SWNT-polymer interface is suggested to contribute to the dissociation of photo-generated excitons.

Published in:

2008 2nd IEEE International Nanoelectronics Conference

Date of Conference:

24-27 March 2008