We demonstrate that monolayer and bilayer films of thiol-capped gold nanoclusters can exhibit prominent rectification properties, provided spatial asymmetry exists between the two tunnel junctions used to connect the nanoclusters. Systematic x-ray reflectivity and atomic force microscopy (AFM) measurements were carried out to characterize the spatial asymmetry introduced by a monolayer of fatty acid salt used to deposit thiol-capped gold nanoclusters on a hydrophilic substrate using the Langmuir–Blodgett technique. Current-voltage characteristics, obtained from conducting probe AFM measurements, show rectification ratios of 13.5 and 364.8 for the monolayer and bilayer films, respectively.
- Received 4 January 2005
- Revised 18 February 2005
- Published 24 March 2005
© 2005 The American Physical Society