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Related Concept Videos

Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

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Fabricating Nanogaps by Nanoskiving
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Robust nanogap electrodes by self-terminating electroless gold plating.

Victor M Serdio V1, Yasuo Azuma, Shuhei Takeshita

  • 1Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan.

Nanoscale
|October 17, 2012
PubMed
Summary

Robust nanogap electrodes were mass-produced using electron beam lithography and electroless gold plating. This method achieved a 90% yield for nanodevices, enabling stable single-electron transistors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Developing robust nanogap electrodes is crucial for advancing nanodevices.
  • Existing fabrication methods often struggle with yield and reproducibility.

Purpose of the Study:

  • To develop a high-yield, reproducible method for fabricating robust nanogap electrodes.
  • To demonstrate the functionality of these electrodes in single-electron transistors.

Main Methods:

  • Simultaneous mass-production using electron beam lithography (EBL) and electroless gold plating (EGP).
  • Controlled gold layer growth via self-termination phenomenon to achieve precise nanogap widths.
  • Surface functionalization using mixed self-assembled monolayers and chemisorption of gold nanoparticles.

Main Results:

  • Achieved 90% yield for nanogap electrodes with a separation of 3.0 ± 1.7 nm.
  • Demonstrated electrode robustness up to 170 °C and resistance to oxygen plasma ashing.
  • Fabricated chemically assembled single-electron transistors exhibiting stable and reproducible Coulomb diamonds.

Conclusions:

  • The combined EBL and EGP technique offers a scalable and reliable method for nanogap electrode fabrication.
  • The self-termination phenomenon in EGP is key to achieving high yield and precise gap control.
  • These robust nanogap electrodes are suitable for constructing high-performance molecular electronic devices.