Formation of rectifier with gold nanoclusters

Details Formation of rectifier with gold nanoclusters Formation of rectifier with gold nanoclusters

2005-01-19

arxiv.org/abs/cond-mat/0501453v1

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.

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