Physics – Condensed Matter – Materials Science
Scientific paper
2009-02-12
Nano Letters 2009, 9, (3), 1028-1033
Physics
Condensed Matter
Materials Science
Accepted by Nano Letters
Scientific paper
10.1021/nl8032922
We present a nanoscale color detector based on a single-walled carbon nanotube functionalized with azobenzene chromophores, where the chromophores serve as photoabsorbers and the nanotube as the electronic read-out. By synthesizing chromophores with specific absorption windows in the visible spectrum and anchoring them to the nanotube surface, we demonstrate the controlled detection of visible light of low intensity in narrow ranges of wavelengths. Our measurements suggest that upon photoabsorption, the chromophores isomerize from the ground state trans configuration to the excited state cis configuration, accompanied by a large change in dipole moment, changing the electrostatic environment of the nanotube. All-electron ab initio calculations are used to study the chromophore-nanotube hybrids, and show that the chromophores bind strongly to the nanotubes without disturbing the electronic structure of either species. Calculated values of the dipole moments support the notion of dipole changes as the optical detection mechanism.
Krafcik Karen L.
Leonard Francois
Vance Andrew L.
Wong Bryan M.
Zhou Xinjian
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