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Updated: May 22, 2026

Synthesis and Characterization of Amphiphilic Gold Nanoparticles
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Formyloxyl radical-gold nanoparticle binding: a theoretical study.

Jacob M Hull1, Makenzie R Provorse, Christine M Aikens

  • 1Department of Chemistry, 213 CBC Building, Kansas State University, Manhattan, Kansas 66506, USA.

The Journal of Physical Chemistry. A
|May 24, 2012
PubMed
Summary

Citrate reduction is common for gold nanoparticle synthesis. This study reveals oxidized species, not citrate, likely act as capping agents, influencing nanoparticle properties through structural distortion.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Computational Chemistry

Background:

  • Citrate reduction is a primary method for synthesizing gold nanoparticles.
  • Citrate is traditionally considered both a reducing and capping agent.
  • Recent DFT studies suggest limitations in citrate's capping ability.

Purpose of the Study:

  • To investigate the binding interactions between gold nanoparticles and oxidized carboxylate species.
  • To model neutral carboxylate-gold nanoparticle binding using DFT.
  • To understand the role of oxidized species in gold nanoparticle formation.

Main Methods:

  • Density Functional Theory (DFT) calculations at the BP86/DZ level.
  • Modeling of Au(20)-formyloxyl radical interactions.

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  • Refinement of binding energies using a TZP basis set.

    • Main Results:

    • Formyloxyl radical binding remained highly favorable through eight additions.
    • Binding energies ranged from 154-331 kJ/mol.
    • Gold tetrahedron distortion was observed after the third addition.

    Conclusions:

    • Oxidized species, rather than citrate itself, are likely the primary capping agents.
    • Ligand binding can induce structural distortions in gold nanoparticles.
    • These distortions may significantly impact nanoparticle properties.