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Linker-Free Synthesis of Core/Satellite Nanoparticles for Single-Particle Surface-Enhanced Raman Spectroscopy and

Sanjun Fan1, Brian T Scarpitti1, Abigail E Smith1

  • 1Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States.

Nano Letters
|May 6, 2025
PubMed
Summary

A novel linker-free method synthesizes complex core/satellite nanoparticles. These nanoparticles, including gold nanostar/gap-enhanced Raman tags and silver-platinum hybrids, show promise for single-particle photocatalysis and analysis.

Keywords:
GERTsSERScore/satellite nanoparticlelinker-free methodsingle-particle photocatalysis

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Chemistry

Background:

  • Core/satellite (CS) nanoparticles offer unique properties for advanced applications.
  • Existing synthesis methods often rely on linker molecules, which can complicate analysis and limit functionality.

Purpose of the Study:

  • To develop a facile and novel linker-free method for synthesizing core/satellite nanoparticles.
  • To explore the formation of various noble metal CS nanoparticles and their photocatalytic properties.

Main Methods:

  • Synthesis of gold nanostar/gap-enhanced Raman tags (GERTs) CS nanoparticles via growth of gold spheres on nanostar tips.
  • Preparation of gold nanostar/silver sphere CS nanoparticles and subsequent galvanic replacement to form porous gold nanostar/silver-gold, silver-platinum, or silver-palladium sphere CS nanoparticles.
  • In situ surface-enhanced Raman spectroscopy for monitoring single-particle photocatalysis.

Main Results:

  • Stable and ultrabright Au nanostar/GERTs CS nanoparticles were successfully synthesized.
  • A direct route to porous Au nanostar/Ag-Au, Ag-Pt, or Ag-Pd sphere CS nanoparticles was established.
  • Hybrid Ag-Pt CS nanoparticles exhibited the fastest photocatalytic rates for 4-nitrothiophenol conversion at the single-particle level.

Conclusions:

  • The linker-free method provides a direct synthetic route to complex CS nanoparticles without linker interference.
  • These novel CS nanoparticles demonstrate potential for advanced single-particle analysis and photocatalysis.
  • Hybrid Ag-Pt CS nanoparticles show exceptional photocatalytic efficiency, opening new avenues in catalysis research.