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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Platinum-nanogaps for single-molecule electronics: room-temperature stability.

Ferry Prins1, Ahson J Shaikh, Jan H van Esch

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands. f.prins@tudelft.nl

Physical Chemistry Chemical Physics : PCCP
|May 10, 2011
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Summary

We created stable single-molecule devices using platinum electrodes and a novel fabrication method. This allows distinguishing molecular conductance from direct tunneling, revealing different transport regimes like Coulomb blockade.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Single-molecule devices are crucial for future electronics.
  • Stable, room-temperature nanogaps are needed for reliable measurements.
  • Distinguishing molecular transport from electrode effects is challenging.

Purpose of the Study:

  • To develop stable single-molecule devices.
  • To differentiate molecular conductance from direct tunneling.
  • To investigate charge transport mechanisms in single molecules.

Main Methods:

  • Fabrication of nanometre-spaced platinum electrodes via self-breaking electromigration.
  • Room-temperature stability testing of fabricated nanogaps.
  • Electrical characterization before and after single-molecule deposition.

Main Results:

  • Achieved long-term stable nanogaps at room temperature.
  • Successfully distinguished direct electrode tunneling from molecular conductance.
  • Observed both strong coupling and weak-coupling Coulomb blockade regimes.
  • Demonstrated gated transport in the Coulomb blockade regime.

Conclusions:

  • The electromigration method enables stable single-molecule device fabrication.
  • The approach allows for detailed analysis of molecular electronic properties.
  • Different charge transport regimes can be accessed and controlled in these devices.