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Related Experiment Video

Updated: Feb 2, 2026

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride

Published on: July 1, 2020

Single Au Atom Doping of Silver Nanoclusters.

Marte van der Linden^1,2, Arnoldus J van Bunningen³, Lucia Amidani²

¹Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science , Utrecht University , Universiteitslaan 99 , 3584 CG Utrecht , The Netherlands.

|November 21, 2018

Summary

Gold doping enhances the stability and luminescence of silver nanoclusters. The gold atoms preferentially center within the silver nanocluster structure, improving radiative decay and quantum yield.

Keywords:

Ag29 Au1Ag28 X-ray spectroscopy bimetallic nanocluster doping luminescence structure elucidation

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Last Updated: Feb 2, 2026

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Published on: July 1, 2020

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Published on: December 6, 2021

Area of Science:

Nanomaterials Science
Inorganic Chemistry
Physical Chemistry

Background:

Silver nanoclusters (AgNCs) capped with lipoic acid (LA) are investigated for their unique optical properties.
Doping these nanoclusters with other metals offers a route to tune their characteristics.

Purpose of the Study:

To investigate the effect of gold (Au) doping on the stability and luminescence of Ag29 nanoclusters capped with lipoic acid (LA).
To elucidate the structural and electronic properties of the Au-doped AgNCs.

Main Methods:

Synthesis of Au-doped Ag29 nanoclusters.
Characterization using mass spectrometry to determine composition.
X-ray absorption spectroscopy (XAS) at the Au L3-edge, including extended absorption fine structure (EXAFS) and near-edge X-ray absorption fine structure (XANES).
Electronic structure calculations.

Main Results:

Au doping significantly enhances the stability and luminescence efficiency (quantum yield) of Ag29(LA) nanoclusters.
Mass spectrometry identified the predominant species as Au1Ag28(LA)12^3-.
XAS and calculations confirmed preferential localization of the Au dopant at the center of the nanocluster.
XANES provided valuable structural information at lower concentrations and shorter acquisition times compared to EXAFS.

Conclusions:

Gold doping is an effective strategy to improve the performance of lipoic acid-capped silver nanoclusters.
The central location of gold atoms is crucial for the enhanced radiative decay and quantum yield.
XANES spectroscopy is a powerful and efficient tool for the structural characterization of doped nanoclusters.