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Related Experiment Video

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Nanosecond Time-Resolution Study of Gold Nanorod Rotation at the Liquid-Solid Interface.

Bhanu Neupane1,2,3, Fang Chen2, Yanli Wei2

  • 1Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27599-7115, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|April 11, 2016
PubMed
Summary
This summary is machine-generated.

Gold nanorods interacting with glass surfaces exhibit intermittent, not continuous, rotation. These nanorods spend most time in weakly immobilized states, rotating slowly between them.

Keywords:
adsorptionfluctuation correlation spectroscopygold nanorodsrotationsurface plasmon resonance

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Area of Science:

  • Surface science
  • Nanotechnology
  • Physical chemistry

Background:

  • Nanorod adsorption can involve an anchored state with rotational freedom.
  • Understanding nanorod rotation is key to particle-surface interactions.
  • Previous studies suggested continuous rotation of gold nanorods on glass.

Purpose of the Study:

  • To investigate the rotation dynamics of anchored gold nanorods on negatively charged glass surfaces.
  • To clarify the nature of nanorod rotation following surface interactions.

Main Methods:

  • Utilized nanosecond time-resolution studies.
  • Observed gold nanorod interactions with negatively charged glass surfaces.

Main Results:

  • Apparent continuous rotation is composed of numerous fast, intermittent rotations.
  • Gold nanorods spend most time in weakly immobilized states.
  • Transitions between immobilized states occur on a millisecond timescale, ~50x slower than in bulk solution.

Conclusions:

  • Gold nanorod rotation on glass is not continuous but intermittent.
  • Weakly immobilized states dominate nanorod-surface interactions.
  • The study reveals a slower rotation mechanism than previously assumed.