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 ~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 nano-photodetectors.

4 pages, 4 figures

References in corpus (4)

• The Ratio Problem in Single Carbon Nanotube Fluorescence Spectroscopy
• Photo-gating Carbon Nanotube Transistors
• Crosstalk between nanotube devices: contact and channel effects
• Properties of short channel ballistic carbon nanotube transistors with ohmic contacts

Cited by in corpus (7)

• Uncooled Carbon Nanotube Photodetectors
• Electronic Properties of Vinylene-Linked Heterocyclic Conducting Polymers: Predictive Design and Rational Guidance from DFT Calculations
• Spectroscopic Properties of Nanotube-Chromophore Hybrids
• Photoconductance of organic single-molecule contacts
• Functionalization of Single-Wall Carbon Nanotubes with Chromophores of Opposite Internal Dipole Orientation
• Structure of Carbon Nanotube-dendrimer composite
• Color Detection Using Chromophore-Nanotube Hybrid Devices