Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-11-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To appear in Appl. Phys. Lett. in Dec. 2002
Scientific paper
10.1063/1.1528285
A simple and highly reproducible technique is demonstrated for the fabrication of metallic electrodes with nanometer separation. Commercially available bare gold colloidal nanoparticles are first trapped between prefabricated large-separation electrodes to form a low-resistance bridge by an ac electric field. A large dc voltage is then applied to break the bridge via electromigration at room temperature, which consistently produces gaps in the sub-10 nm range. The technique is readily applied to prefabricated electrodes with separation up to 1 micron, which can be defined using optical lithography. The simple fabrication scheme will facilitate electronic transport studies of individual nanostructures made by chemical synthesis. As an example, measurement of a thiol-coated gold nanoparticle showing a clear Coulomb staircase is presented.
Khondaker Saiful I.
Yao Zhen
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