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Related Experiment Video

Updated: Jun 23, 2025

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Poly(N-Heterocyclic Carbene)-Capped Alloy and Core-Shell AuAg Bimetallic Nanoparticles.

Diep T H Nguyen1, Samaneh Salek1, Lorianne R Shultz-Johnson2

  • 1Department of Chemistry, Université du Québec à Montréal, NanoQAM, Quebec Center for Advanced Materials (QCAM), C.P.8888, Succursale Centre-Ville, Montreal, QC, H3C 3P8, Canada.

Angewandte Chemie (International Ed. in English)
|June 18, 2024
PubMed
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Molecular and Electronic Structural Studies of <i>d</i><sup>3</sup>-<i>d</i><sup>3</sup> and <i>d</i><sup>5</sup>-<i>d</i><sup>5</sup> M<sub>2</sub>R<sub>6</sub> Complexes (M = Mo, Ru; R = CH<sub>3</sub>, CH<sub>2</sub>CMe<sub>3</sub>): On the Interplay of Metal-Metal Bond Order and MR<sub>3</sub> Pyramidalization.

Inorganic chemistry·2025

Researchers developed a new method to create bimetallic gold-silver (AuAg) nanoparticles using polymerized N-heterocyclic carbene (NHC) ligands. Adjusting metal content allows control over nanoparticle structure, creating alloys or core-shell arrangements for catalytic applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • N-heterocyclic carbene (NHC)-stabilized metal nanoparticles (NPs) are of significant interest.
  • Research has primarily focused on monometallic NHC-NPs, with bimetallic counterparts being less explored.
  • Developing stable and tunable bimetallic NHC-NPs is crucial for advanced applications.

Purpose of the Study:

  • To develop a novel method for synthesizing bimetallic gold-silver (AuAg) nanoparticles stabilized by polymerized N-heterocyclic carbene (NHC) ligands.
  • To investigate the influence of metal composition in polymeric substrates on the microstructure of the resulting bimetallic NPs.
  • To evaluate the electrocatalytic activity of these novel bimetallic NHC-NPs for the oxygen reduction reaction.

Main Methods:

Keywords:
Bimetallic NanoparticlesMesoionic NHCsNanoparticlesOxygen Reduction ReactionPolymerized NHCs

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  • Covalent immobilization of gold (Au) and silver (Ag) atoms onto polymerized NHC substrates.
  • Synthesis of bimetallic polymeric substrates with varying Au:Ag ratios.
  • Characterization of the resulting bimetallic AuAg nanoparticles (NPs), distinguishing between alloy and core-shell structures.
  • Electrochemical evaluation of the NPs for oxygen reduction reaction (ORR) activity.

    • Main Results:

    • A facile method was established for creating bimetallic AuAg NPs by immobilizing Au and Ag onto polymerized NHCs.
    • The microstructure of the bimetallic NPs could be controlled by adjusting the metal content in the polymeric substrate.
    • Lower Ag content relative to Au in the substrate led to the formation of Au core-Ag shell NPs, while higher content favored alloy formation.
    • All synthesized bimetallic NHC-NPs demonstrated electrocatalytic activity for the oxygen reduction reaction.

    Conclusions:

    • Bimetallic poly(NHC-metal)s serve as effective substrates for accessing NHC-stabilized bimetallic NPs.
    • Precise control over metal composition in polymeric substrates allows for tuning the NP microstructure (alloy vs. core-shell).
    • These tunable bimetallic NHC-NPs exhibit promising electrocatalytic performance for the oxygen reduction reaction, opening avenues for catalyst development.