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Electrochemical fabrication and characterization of nanocontacts and nm-sized gaps

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Abstract

Copper nanocontacts and molecular-sized nanogaps were prepared and characterized at electrified solid/liquid interfaces employing lithographic and electrochemical techniques. A dedicated four-electrode potentiostat was developed for controlling the electrochemical fabrication process and for monitoring the electrical characteristics of the nanostructures created. The formation and breaking of Cu nanocontacts exhibits conductance quantization characteristics. The statistical analysis of conductance histograms revealed a preferential stability of nanocontacts with integer values of G0, with a clear preference for 1 G0, 2 G0 and 3 G0. The growth of molecular-sized gaps shows quantized tunneling current, which is attributed to the discrete nature of Cu atoms, water molecules, and specifically adsorbed ions.

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Authors and Affiliations

  1. Institute of Bio- and Nanosystems IBN, Research Center Jülich GmbH, 52425, Jülich, Germany

    G. Mészáros, D. Mayer & T. Wandlowski

  2. Institute of Solid State Physics and CNI – Center of Nanoelectronic Systems for Information Technology, Research Center Jülich GmbH, 52425, Jülich, Germany

    S. Kronholz & S. Karthäuser

Authors
  1. G. Mészáros
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  2. S. Kronholz
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  3. S. Karthäuser
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  4. D. Mayer
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  5. T. Wandlowski
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Corresponding author

Correspondence to T. Wandlowski.

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PACS

73.23Ad; 73.63.Rt; 82.45.Yz; 85.35.-p

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Mészáros, G., Kronholz, S., Karthäuser, S. et al. Electrochemical fabrication and characterization of nanocontacts and nm-sized gaps. Appl. Phys. A 87, 569–575 (2007). https://doi.org/10.1007/s00339-007-3903-2

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  • DOI: https://doi.org/10.1007/s00339-007-3903-2

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