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Investigations of self-organisation in composites of poly(3-hexylthiophene) on single-walled carbon nanotubes designed for use in photovoltaic applications

Waclawik, Eric R., Bell, John M., Goh, Roland G., & Motta, Nunzio (2006) Investigations of self-organisation in composites of poly(3-hexylthiophene) on single-walled carbon nanotubes designed for use in photovoltaic applications. In Nicolau, Ian (Ed.) SPIE "BioMEMS and Nanotechnology II", 11–14 December 2005, Brisbane.

Abstract

A detailed study of poly(alkylthiophene) self-assembly and organization on single-walled carbon nanotubes (SWNTs) is presented. Experimental evidence for self-assembly and organization of regioregular poly(3-hexyl thiophene) (rrP3HT) on single-walled carbon nanotubes was obtained using scanning tunneling microscopy (STM) and transmission electron microscopy (TEM). TEM images of drop-cast rrP3HT/SWNT composites displayed strong evidence that SWNTs were isolated from each other in a polymer matrix and coated with between 1-3 layers rrP3HT. STM measurements of adsorbed monolayers of rrP3HT on SWNT surfaces were compared to rrP3HT monolayer deposition on highly ordered pyrolytic graphite (HOPG) surfaces. The results show that average inter-lamellar distances of adsorbed polymer are greater for rrP3HT monolayers adsorbed onto the curved surfaces of SWNTs than on the flat surfaces of HOPG samples. Analysis of STM images yielded the chiral angles at which the thiophene polymer chains wrap around individual carbon nanotubes (41-48º with respect to nanotube axis) while the interchain spacings of adsorbed macromolecules was 1.68 ± 0.02 nm. Comparisons between the native polymer deposited on graphite and the composite structure confirmed that the presence of carbon nanotubes in rrP3HT produces a material with a high degree of order at the molecular level. This high level of order and close coupling of the two components of the composite are prerequisites for its use as the active layer of an organic photovoltaic.

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ID Code: 5028
Item Type: Conference Paper
Additional URLs:
Keywords: Nanotubes, Polymers, P3HT, Solar Cells
ISBN: 9780819460677
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ORGANIC CHEMISTRY (030500) > Physical Organic Chemistry (030505)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Surfaces and Structural Properties of Condensed Matter (020406)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 SPIE
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 20 Sep 2006
Last Modified: 29 Feb 2012 23:16

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