Controlled Fabrication of Nanogaps in Ambient Environment for Molecular Electronics

Details Controlled Fabrication of Nanogaps in Ambient Environment for Molecular Electronics Controlled Fabrication of Nanogaps in Ambient Environment for Molecular Electronics

2005-04-05

arxiv.org/abs/cond-mat/0504112v1

Applied Physics Letters 86, 043109 (24 January 2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages

Scientific paper

10.1063/1.1857095

We have developed a controlled and highly reproducible method of making nanometer-spaced electrodes using electromigration in ambient lab conditions. This advance will make feasible single molecule measurements of macromolecules with tertiary and quaternary structures that do not survive the liquid-helium temperatures at which electromigration is typically performed. A second advance is that it yields gaps of desired tunnelling resistance, as opposed to the random formation at liquid-helium temperatures. Nanogap formation occurs through three regimes: First it evolves through a bulk-neck regime where electromigration is triggered at constant temperature, then to a few-atom regime characterized by conductance quantum plateaus and jumps, and finally to a tunnelling regime across the nanogap once the conductance falls below the conductance quantum.

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