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Quantized conductance and switching in percolating nanoparticle films.

Abdul Sattar1, Shawn Fostner, Simon A Brown

  • 1The MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.

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|October 15, 2013
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Summary

Switching behavior and quantized conductance were observed at room temperature in nanoparticle films. These phenomena arise from atomic-scale wires forming in tunnel gaps between particles near the percolation threshold.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Percolating nanoparticle films are explored for electronic applications.
  • Understanding charge transport mechanisms in disordered nanomaterials is crucial.

Purpose of the Study:

  • To investigate switching behavior and quantized conductance in nanoparticle films at room temperature.
  • To elucidate the underlying physical mechanisms responsible for these electronic properties.

Main Methods:

  • Experimental fabrication and characterization of percolating nanoparticle films.
  • Complementary computational simulations to model charge transport.
  • Analysis of electrical transport properties near the percolation threshold.

Main Results:

  • Demonstrated room-temperature switching behavior and quantized conductance.
  • Identified the formation of atomic-scale wires in inter-particle tunnel gaps as the cause.
  • Observed these effects specifically in films with tunnel gaps near the percolation threshold.

Conclusions:

  • Atomic-scale wire formation in tunnel gaps governs switching and quantized conductance in these systems.
  • The presence of tunnel gaps near the percolation threshold is critical for observing these phenomena.
  • Findings offer insights into nanoscale electronic transport and potential applications.