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Related Experiment Videos

Atomic force microscopy captures quantized plastic deformation in gold nanowires.

P E Marszalek1, W J Greenleaf, H Li

  • 1Department of Physiology and Biophysics, Mayo Foundation, Rochester, MN 55905, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 7, 2000
PubMed
Summary

Gold nanowires elongate and shorten in precise atomic steps, revealing quantized plastic deformation. This study uses atomic force microscopy to uncover the atomic-level mechanisms of metal nanowire behavior.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Scanning probe microscopy is crucial for observing atomic-scale structural changes.
  • Understanding the mechanical behavior of nanomaterials is vital for developing new technologies.

Purpose of the Study:

  • To measure the length changes of gold nanowires during mechanical stress cycles.
  • To elucidate the atomic mechanisms governing the plastic deformation of gold nanowires.

Main Methods:

  • Utilized atomic force microscopy (AFM) to apply controlled extension and compression forces to gold nanowires.
  • Monitored in-situ length changes at the atomic scale during deformation cycles.

Main Results:

  • Observed quantized elongation in steps up to three multiples of 1.76 Å under tensile force.

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  • Detected spontaneous shortening in discrete steps of 1.52 Å.
  • Identified simultaneous slip events, consistent with the tetrahedral arrangement of slip planes in gold crystals.

    • Conclusions:

    • The observed quantized steps and slip events provide direct evidence for the sliding of crystal planes, leading to stacking faults and phase transitions (FCC to HCP).
    • These findings explain the fundamental mechanism of plastic deformation in gold nanowires.
    • The methodology can be extended to study plastic failure in other metallic nanomaterials.