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Updated: Mar 29, 2026

Gold Nanoparticle Synthesis
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Gold Nanoparticle Synthesis

Published on: July 10, 2021

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Surface engineered gold nanoparticles through highly stable metal-surfactant complexes.

Sunghwan Kim1, Youngjin Jang2, Ki Youl Yoon3

  • 1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.

Journal of Colloid and Interface Science
|November 27, 2015
PubMed
Summary

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We developed a stable method for synthesizing uniform gold nanoparticles (Au NPs) using a gold-decyltrimethylammonium bromide (Au-DTAB) complex. Surface engineering with polymeric imidazole ligands (PILs) enhanced their colloidal stability in aqueous solutions.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Gold nanoparticles (Au NPs) are crucial in various applications.
  • Existing synthesis methods often lack stability or scalability.
  • Surface functionalization is key to enhancing nanoparticle stability and utility.

Purpose of the Study:

  • To develop a stable and scalable synthesis of monodispersed gold nanoparticles.
  • To engineer the surface of gold nanoparticles for improved colloidal stability in aqueous media.
  • To investigate the efficacy of polymeric imidazole ligands (PILs) for gold nanoparticle stabilization.

Main Methods:

  • Synthesis of gold-decyltrimethylammonium bromide (Au-DTAB) complex from HAuCl4 and DTAB.
  • Controlled reduction of Au-DTAB complex to form monodispersed Au nanoparticles (5-10 nm).
Keywords:
Au-DTABMonodispersedMultidentatePolymeric imidazole ligandsSurface engineered

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  • Surface functionalization of Au nanoparticles using multidentate polymeric imidazole ligands (PILs).
  • Characterization using transmission electron microscopy (TEM), UV-Vis spectroscopy, XRD, FTIR, and dynamic light scattering (DLS).

    • Main Results:

    • Stable and uniform Au nanoparticles (5-10 nm) were synthesized via Au-DTAB reduction.
    • PILs provided enhanced binding stability to the Au surface compared to thiol ligands.
    • Surface-engineered Au nanoparticles exhibited superior colloidal stability in aqueous solutions.
    • PILs circumvented issues of oxidative cross-linking and disulfide bond formation.

    Conclusions:

    • The Au-DTAB complex facilitates scalable and stable synthesis of uniform Au nanoparticles.
    • Polymeric imidazole ligands offer a robust alternative for surface engineering, enhancing colloidal stability.
    • This approach provides a promising platform for developing stable, functionalized gold nanoparticles for diverse applications.