Photoinduced conductivity of a porphyrin-gold composite nanowire.
J Phys Chem A
; 113(16): 4549-56, 2009 Apr 23.
Article
em En
| MEDLINE
| ID: mdl-19278216
ABSTRACT
Negatively charged phosphine groups on the backbone of DNA are known to attract gold nanoclusters from a colloid, assembling the clusters at fixed intervals. Bridging these intervals with porphyrin-dye linkers forms an infinite conducting chain, a quantum wire whose carrier mobility can be enhanced by photoexcitation. The resulting nanoassembly can be used as a gate a wire with a controllable conductivity. The electronic structure of the porphyrin-gold wire is studied here by density functional theory, and the conductivity of the system is determined as a function of the photoexcitation energy. Photoexcitations of the dye are found to enhance the wire conductivity by orders of magnitude.
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MEDLINE
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En
Ano de publicação:
2009
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Article