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Optically Modulated Conduction in Chromophore-Functionalized Single-Wall Carbon Nanotubes

J. M. Simmons, I. In, V. E. Campbell, T. J. Mark, F. Léonard, P. Gopalan, and M. A. Eriksson
Phys. Rev. Lett. 98, 086802 – Published 22 February 2007

Abstract

We demonstrate an optically active nanotube-hybrid material by functionalizing single-wall nanotubes with an azo-based chromophore. Upon UV illumination, the conjugated chromophore undergoes a cis-trans isomerization leading to a charge redistribution near the nanotube. This charge redistribution changes the local electrostatic environment, shifting the threshold voltage and increasing the conductivity of the nanotube transistor. For a 1%2% coverage, we measure a shift in the threshold voltage of up to 1.2 V. Further, the conductance change is reversible and repeatable over long periods of time, indicating that the chromophore-functionalized nanotubes are useful for integrated nanophotodetectors.

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  • Received 8 November 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.086802

©2007 American Physical Society

Authors & Affiliations

J. M. Simmons1, I. In2, V. E. Campbell2, T. J. Mark2, F. Léonard3, P. Gopalan2, and M. A. Eriksson1

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 2Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 3Sandia National Laboratories, Livermore, California 94551, USA

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Issue

Vol. 98, Iss. 8 — 23 February 2007

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