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Proceedings Paper

Purification and processing of carbon nanotubes using self-assembly and selective interaction with a semiconjugated polymer
Author(s): Patrick Fournet; Brendan McCarthy; Alan Brian Dalton; Jonathan N. Coleman; Robert J. Murphy; Christophe Stephan; Serge Lefrant; Patrick Bernier; Hugh James Byrne; Werner J. Blau
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Paper Abstract

A new route for nanotube-based applications in molecular electronics was developed. Individual polymer strands were assembled onto single-walled carbon nanotubes (SWNT) and multi-walled carbon nanotubes (MWNT) by mechanical agitation. The SWNT hybrid systems have been characterized by electron microscopy (TEM, STM), optical absorption and Raman spectroscopy and a fully nondestructive technique, using electron paramagnetic resonance (EPR), has been developed to estimate the purity of MWNT soot and hybrids. It is demonstrated that solutions of the polymer are capable of suspending nanotubes indefinitely while the majority of the accompanying amorphous graphite precipitates out of solution. Electron microscopy and Raman scattering indicate that through an intercalation process, the ropes of SWNT are destroyed, resulting in individual nanotubes being well dispersed within the polymer matrix. Moreover, Raman and absorption studies suggest that the polymer interacts preferentially with nanotubes of specific diameters or a range of diameters. STM studies showed that the chiral angle of the underlying nanotube is reflected in the polymer coating, demonstrating that the lattice structure of the SWNT templates the ordering in the coating. This could lead to design of specific polymer architectures for selection of desired chiral angles, and hence specific electronic properties.

Paper Details

Date Published: 27 December 2001
PDF: 12 pages
Proc. SPIE 4468, Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing, (27 December 2001); doi: 10.1117/12.452546
Show Author Affiliations
Patrick Fournet, Trinity College (Ireland)
Brendan McCarthy, Trinity College (Ireland)
Alan Brian Dalton, Dublin Institute of Technology (United States)
Jonathan N. Coleman, Trinity College (Ireland)
Robert J. Murphy, Trinity College (Ireland)
Christophe Stephan, Institut des Materiaux Jean Rouxel (France)
Serge Lefrant, Institut des Materiaux Jean Rouxel (France)
Patrick Bernier, Univ. de Montpellier II (France)
Hugh James Byrne, Dublin Institute of Technology (Ireland)
Werner J. Blau, Trinity College (Ireland)

Published in SPIE Proceedings Vol. 4468:
Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing
Emile J. Knystautas; Wiley P. Kirk; Valerie Browning, Editor(s)

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