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A General One-Step Synthesis of Alkanethiyl-Stabilized Gold Nanoparticles with Control over Core Size and Monolayer

Stefan Borsley1, William Edwards1, Ioulia K Mati1

  • 1EaStCHEM School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K.

Chemistry of Materials : a Publication of the American Chemical Society
|August 14, 2023
PubMed
Summary

Researchers developed a one-step method to create gold nanoparticles (AuNPs) with tunable size and surface chemistry. This new protocol offers precise control over core size, enabling diverse applications.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Colloidal Chemistry

Background:

  • Gold nanoparticles (AuNPs) exhibit unique size-dependent properties crucial for various applications.
  • Existing synthetic methods often struggle to independently control AuNP core size and surface chemistry.
  • Post-synthesis ligand exchange is inefficient and delicate for functionalizing AuNPs.

Purpose of the Study:

  • To develop a reliable one-step protocol for synthesizing monolayer-stabilized AuNPs.
  • To enable independent tuning of AuNP core size and surface chemistry.
  • To create versatile colloidal building blocks for advanced materials.

Main Methods:

  • A single-phase reaction using tert-butylamine borane as a mild reducing agent.
  • Controlled addition rate of the reducing agent to manage reaction kinetics.
  • Compatibility with a wide range of ligand functional groups and solvent polarities (toluene to water).

Main Results:

  • Successful synthesis of AuNPs with controllable core sizes ranging from 2-10 nm.
  • Independent control of core size achieved by adjusting the reduction rate, without affecting size distribution.
  • Preservation of reactive chemical functionalities on surface-stabilizing ligands.
  • AuNPs stable in solvents spanning a wide polarity range.

Conclusions:

  • A robust, one-step protocol for synthesizing high-quality, functionally sophisticated AuNPs.
  • The method allows precise control over AuNP size and surface chemistry.
  • Generated AuNPs serve as versatile building blocks for complex nanoparticle-based devices and materials.