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Related Experiment Videos

Optically modulated conduction in chromophore-functionalized single-wall carbon nanotubes.

J M Simmons1, I In, V E Campbell

  • 1Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Functionalizing single-wall nanotubes with an azo chromophore creates an optically active material. UV light triggers reversible conductivity changes, enabling applications in nanophotodetectors.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Single-wall nanotubes (SWNTs) possess unique electronic properties.
  • Functionalization of nanomaterials can tune their optoelectronic behavior.

Purpose of the Study:

  • To develop an optically active nanotube-hybrid material.
  • To investigate the effect of light-induced molecular changes on nanotube transistor performance.

Main Methods:

  • Functionalization of SWNTs with an azo-based chromophore.
  • Fabrication and characterization of nanotube transistors.
  • UV illumination to induce cis-trans isomerization of the chromophore.

Main Results:

  • UV illumination caused charge redistribution, altering the nanotube's electrostatic environment.

Related Experiment Videos

  • A threshold voltage shift of up to 1.2 V was observed with 1%-2% chromophore coverage.
  • The observed conductance changes were reversible and repeatable.

    • Conclusions:

    • The hybrid material exhibits light-responsive conductivity modulation.
    • Chromophore-functionalized nanotubes show promise for integrated nanophotodetector applications.