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Investigating single silver nanoparticle electrodissolution using microelectrodes reveals citrate slows silver ion release. Only about half of the oxidized nanoparticle is released as free silver ions.

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Area of Science:

  • Electrochemistry
  • Nanoparticle Science
  • Materials Science

Background:

  • Understanding the electrodissolution dynamics of individual metal nanoparticles is crucial for applications in catalysis, sensing, and nanotechnology.
  • Previous studies often focus on bulk dissolution, lacking insights into the behavior of single nanoparticles.

Purpose of the Study:

  • To probe the electrodissolution dynamics of single silver nanoparticles at high temporal resolution.
  • To investigate the effect of citrate concentration on the release of silver ions (Ag+) during electrodissolution.
  • To determine the proportion of oxidized silver nanoparticle released as free Ag+.

Main Methods:

  • Utilized an adjustable gap (600 nm to 20 μm) between two gold (Au) microelectrodes.
  • One Au microelectrode oxidized a single silver (Ag) nanoparticle, while the second collected the produced Ag+.
  • Analyzed high temporal resolution current-time traces to capture electrodissolution events and capacitive coupling.

Main Results:

  • Observed multi-peak oxidation behavior during single Ag nanoparticle electrodissolution.
  • Identified capacitive coupling between electrodes due to Ag+ ion injection.
  • Demonstrated that 2 mM citrate significantly slows the release of Ag+ from the nanoparticle.
  • Found that approximately 50% of the oxidized Ag nanoparticle is released as free Ag+, irrespective of citrate concentration.

Conclusions:

  • The microelectrode setup allows for detailed investigation of single nanoparticle electrodissolution.
  • Citrate plays a significant role in modulating the kinetics of silver ion release.
  • A substantial portion of the silver nanoparticle remains undissolved or is not released as free ions, indicating complex dissolution pathways.