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Published March 28, 2002 | public
Journal Article

Interactions between Conjugated Polymers and Single-Walled Carbon Nanotubes


The chemical interactions between single walled carbon nanotubes (SWNTs) and two structurally similar polymers, poly{(m-phenylenevinylene)-co-[(2,5-dioctyloxy-p-phenylene)vinylene]}, or PmPV, and poly{(2,6-pyridinylenevinylene)-co-[(2,5-dioctyloxy-p-phenylene)vinylene]}, or PPyPV, are investigated. The fundamental difference between these two polymers is that PPyPV is a base and is readily protonated via the addition of HCl. Both polymers promote chloroform solubilization of SWNTs. We find that the SWNT/PPyPV interaction lowers the pKa of PPyPV. Optoelectronic devices, fabricated from single polymer-wrapped SWNT structures, reveal a photogating effect on charge transport which can rectify or amplify current flow through the tubes. For PmPV wrapped tubes, the wavelength dependence of this effect correlates to the absorption spectrum of PmPV. For PPyPV, the wavelength dependence correlates with the absorption spectrum of protonated PPyPV, indicating that SWNTs assist in charge stabilization.

Additional Information

© 2002 American Chemical Society. Received 27 November 2001. Published online 3 March 2002. Published in print 1 March 2002. This research was supported by the Office of Naval Research, the Semiconductor Research Corporation, and by the National Science Foundation. R.N. and C.N. acknowledge support from the Fondazione EI.B.A. and by Polo Nazionale Bioelettronica.

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