Electronic transport in dielectrophoretically grown nanowires
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Gold nanoparticles with mean diameter 10–15 nm have been synthesized and stabilized using capping agents in a polar solvent (water) and a non-polar solvent (dodecane). Using two gold bond wires (diameter 0.25 mm and separated by less than 10 μm) as electrodes a sinusoidal driving voltage was applied to the solution. The resulting dielectrophoresis of the solution caused deposition of these nanoparticles at the electrodes and the formation of a wire between the electrodes. Conductance studies of the wire as the final connection formed yielded evidence for low-dimensional transport character in the form of discrete (Landauer) conductance steps. Histogram analysis of the conductance data further supports the conclusion that as the wire forms the capping agents do not always contribute to the electronic transport through the wire.
KeywordsGold Nanoparticles Dodecane Tetrachloroaurate Hydrogen Tetrachloroaurate Tetraoctylammonium Bromide
The authors are grateful for access to the microscopy facilities in the Department of Mechanical & Industrial Engineering at the University of Manitoba as well as access to equipment and reagents in the laboratories of, as well as advice and encouragement from Dr. T. Hegmann and Dr. S. Kroeker in the Department of Chemistry, University of Manitoba. The work reported has been undertaken in facilities provided with assistance from the Canadian Foundation for Innovation (CFI), the Provincial Government of Manitoba and Western Economic Diversification Canada (WD). The project has been funded by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC) and the University of Manitoba. DRO acknowledges support from the Canadian Institute for Advanced Research (CIAR) Nanoelectronics Initiative.
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