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Surface versus solution chemistry: manipulating nanoparticle shape and composition through metal-thiolate

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Researchers synthesized tunable gold-palladium (Au/Pd) bimetallic nanostructures using seed-mediated co-reduction. Thiophenol derivatives controlled nanoparticle shape and composition by influencing surface capping and precursor ligand environments.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Well-defined nanostructures are crucial for applications in energy, security, and medicine.
  • Seed-mediated growth offers a pathway to control nanostructure shape, often dictated by seed symmetry.

Purpose of the Study:

  • To explore the use of thiophenol derivatives in seed-mediated co-reduction for synthesizing shape-controlled gold-palladium (Au/Pd) bimetallic nanostructures.
  • To investigate how additive binding strength and concentration influence the symmetry and composition of Au/Pd nanoparticles (NPs).

Main Methods:

  • Seed-mediated co-reduction synthesis of Au/Pd nanostructures.
  • Introduction of thiophenol derivatives with varying metal-thiolate interaction strengths and concentrations.
  • Analysis of nanoparticle symmetry, composition, and morphology.

Main Results:

  • Tuning of Au/Pd NP symmetry and composition was achieved by varying additive binding strength and concentration.
  • Symmetry reduction was observed in some synthesized nanostructures.
  • Additives with thiol and amine functionalities promoted random branching on octahedral seeds.
  • Thiophenol derivatives were found to modify both surface capping and the local ligand environment of metal precursors.

Conclusions:

  • Thiophenol derivatives offer versatile control over bimetallic nanostructure synthesis through dual roles in surface capping and precursor modification.
  • This approach enables the achievement of high-quality, shape-controlled Au/Pd bimetallic nanostructures.