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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
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Aggregation-Dependent Oxidation of Metal Nanoparticles.

Stacy L Allen1, Jay N Sharma1, Francis P Zamborini1

  • 1Department of Chemistry, University of Louisville , Louisville, Kentucky 40292, United States.

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|August 31, 2017
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Summary

Gold nanoparticle (Au NP) aggregation significantly shifts their oxidation potential to higher values, especially for smaller NPs. This effect is linked to reduced surface area-to-volume ratio in aggregated Au NPs.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Citrate-stabilized gold nanoparticles (Au NPs) are widely used in various applications.
  • Understanding their electrochemical behavior is crucial for optimizing their use.
  • Aggregation can alter the properties of nanoparticles.

Purpose of the Study:

  • To investigate the impact of aggregation on the oxidation potential of Au NPs.
  • To determine how pH-induced aggregation affects Au NP electrochemistry.
  • To correlate changes in oxidation potential with NP size and aggregation extent.

Main Methods:

  • Electrochemical deposition of Au NPs onto glass/ITO electrodes.
  • Controlled aggregation of Au NPs by adjusting solution pH.
  • Electrochemical oxidation studies in a bromide-containing electrolyte.
  • Characterization using UV-vis spectroscopy and scanning electron microscopy (SEM).

Main Results:

  • Well-separated Au NPs exhibit size-dependent oxidation potentials.
  • Aggregation of 4 and 15 nm Au NPs shifts oxidation potential positively (up to 230 mV).
  • The magnitude of the potential shift correlates with the extent of aggregation.
  • No significant oxidation potential shift observed for aggregated 50 nm Au NPs.
  • Reduced surface area-to-volume ratio in aggregated NPs is proposed as the cause.

Conclusions:

  • Au NP aggregation significantly alters their electrochemical oxidation behavior.
  • Smaller Au NPs are more susceptible to aggregation-induced shifts in oxidation potential.
  • Controlling NP aggregation is essential for predictable electrochemical performance.
  • Findings provide insights into nanoparticle surface chemistry and electrochemistry.