Smooth and conductive DNA-templated Cu2O nanowires: growth morphology, spectroscopic and electrical characterization.
Nanotechnology
; 23(7): 075601, 2012 Feb 24.
Article
em En
| MEDLINE
| ID: mdl-22261265
ABSTRACT
DNA strands have been used as templates for the self-assembly of smooth and conductive cuprous oxide (Cu2O) nanowires of diameter 12-23 nm and whose length is determined by the template (16 µm for λ-DNA). A combination of spectroscopic, diffraction and probe microscopy techniques showed that these nanowires comprise single crystallites of Cu2O bound to the DNA molecules which fused together over time in a process analogous to Ostwald ripening, but driven by the free energy of interaction with the template as well as the surface tension. Electrical characterization of the nanowires by a non-contact method, scanned conductance microscopy and by contact mode conductive AFM showed the wires are electrically conductive. The conductivity estimated from the AFM cross section and the zero-bias conductance in conductive AFM experiments was 2.2-3.3 S cm⻹. These Cu2O nanowires are amongst the thinnest reported and show evidence of strong quantum confinement in electronic spectra.
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Base de dados:
MEDLINE
Assunto principal:
DNA Viral
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Bacteriófago lambda
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Cobre
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Nanofios
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article