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Gold nanoclusters encapsulated with organic molecules are of great interestfor its possible applications in the fields of molecular electronics, catalysisand medical science. Here we demonstrate that monolayer and bilayer films ofthiol-capped gold nanoclusters can exhibit diode-like properties providedcontrolled spatial asymmetry exist between two tunnel junctions used to connecta thiol capped gold nanoclusters. Current-voltage characteristics of thisrectifier were obtained from conducting probe atomic force microscopymeasurements and also from conventional two probe resistance measurements.Systematic x-ray reflectivity and atomic force microscopy measurements werecarried out to characterize the spatial asymmetry introduced by a monolayer offatty acid salt gadolinium stearate used to deposit thiol-capped goldnanocluster molecules on hydrophilic SiO2-Si(001) substrate by LangmuirBlodgett technique. This information was used to explain prominentrectification observed in these nano-structured films.Comment: 13 pages, 3 figure

Formation of a rectifier with gold nanoclusters: X-ray reflectivity and atomic force microscopy measurements