Molecular-resolved real-space images of self-assembled structures of the conductive polymer regioregular poly(3-
hexylthiophene) (rrP3HT) on single-walled carbon nanotubes (SWNT) were obtained using scanning tunneling
microscopy (STM). The STM images revealed that the adsorbed polymer typically formed a 10 nm thick coating on
SWNT's. This is in agreement with transmission electron microscopy (TEM) results for drop-cast composite films that
provided strong evidence that SWNTs were isolated in a polymer matrix and coated with rrP3HT multilayers. A 10 nm
thick deposit corresponds to a coating of ~25 layers of polymer on SWNT, assuming that π-π interactions between
rrP3HT layers determine deposition and that the underlying SWNT directs the polymer self-assembly process. STM
measurements of adsorbed monolayers and multilayers of rrP3HT on SWNT surfaces were compared to rrP3HT
monolayer and multilayer deposition on highly ordered pyrolytic graphite (HOPG) surfaces. The average inter-lamellar
distances of adsorbed polymer was greater for both rrP3HT monolayer and multilayer films adsorbed onto the curved
surfaces of SWNTs than on the flat surfaces of HOPG samples. Analysis of STM images yielded the interchain spacings
of adsorbed macromolecules, dcc = 1.55 - 1.68 ± 0.02 nm. The polymer was observed to wrap around some SWNTs at an
angle with respect to the SWNT long-axis, which indicated that the rrP3HT self-assembly is hierarchical. The conductive
polymer's deposition appears to occur with epitaxy and is directed by the underlying SWNT chiral structure.
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 (41-48° 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.
We studied composites of single walled carbon nanotubes and poly(3hexylthiophene) by optical absorption, X-ray diffraction and transmission electron and scanning tunneling microscopy. Dispersing single walled carbon nanotubes in poly(3hexylthiophene) leads to sharpening of vibronic structure and enhanced optical absorbance near the band edge. We show that the enhanced order in the polymer is due to templating of the polymer chains by the surface of the carbon
nanotubes leading to increased electronic delocalization.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.