title: Optically modulated conduction in chromophore-functionalized single-wall carbon nanotubes.
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 approximately 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.
authors.affiliation: Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Simmons
authors.forename: I
authors.initials: I
authors.lastname: In
authors.forename: V E
authors.initials: VE
authors.lastname: Campbell
authors.forename: T J
authors.initials: TJ
authors.lastname: Mark
authors.forename: F
authors.initials: F
authors.lastname: Léonard
authors.forename: P
authors.initials: P
authors.lastname: Gopalan
authors.forename: M A
authors.initials: MA
authors.lastname: Eriksson