Physics – Condensed Matter – Materials Science
Scientific paper
2005-01-19
PHYSICAL REVIEW B 71, 121404(R) 2005
Physics
Condensed Matter
Materials Science
13 pages, 3 figures
Scientific paper
10.1103/PhysRevB.71.121404
Gold nanoclusters encapsulated with organic molecules are of great interest for its possible applications in the fields of molecular electronics, catalysis and medical science. Here we demonstrate that monolayer and bilayer films of thiol-capped gold nanoclusters can exhibit diode-like properties provided controlled spatial asymmetry exist between two tunnel junctions used to connect a thiol capped gold nanoclusters. Current-voltage characteristics of this rectifier were obtained from conducting probe atomic force microscopy measurements and also from conventional two probe resistance measurements. Systematic x-ray reflectivity and atomic force microscopy measurements were carried out to characterize the spatial asymmetry introduced by a monolayer of fatty acid salt gadolinium stearate used to deposit thiol-capped gold nanocluster molecules on hydrophilic SiO2-Si(001) substrate by Langmuir Blodgett technique. This information was used to explain prominent rectification observed in these nano-structured films.
John Neena S.
Kulkarni Giridhar U.
Pal Soumik
Sanyal M. K.
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