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Record-high hyperpolarizabilities in atomically precise single metal-doped silver nanoclusters.

Hao Yuan1, Isabelle Russier-Antoine1, Christophe Moulin1

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Metal doping enhances silver nanoclusters for bio-imaging. Doped silver nanoclusters exhibit superior photostability and nonlinear optical properties, making them ideal for deep-tissue imaging applications.

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Area of Science:

  • Nanotechnology
  • Biophotonics
  • Materials Science

Background:

  • Multi-photon excitation microscopy enables deep cellular imaging.
  • Near-infrared (NIR) absorbing fluorophores are crucial for bio-imaging due to tissue transparency in the NIR region.
  • Ligand-protected gold nanoclusters show promise but have limitations.

Purpose of the Study:

  • To investigate the impact of single metal doping on silver nanoclusters (Ag25).
  • To explore the effects of doping on photostability and nonlinear optical responses.
  • To enhance nonlinear optical scattering properties for improved bio-imaging.

Main Methods:

  • Synthesis of metal-doped Ag25 nanoclusters using 2,4-dimethylbenzenethiol (DMBT) ligand.
  • Characterization of two-photon excited photoluminescence.
  • Measurement of second harmonic (SH) response upon NIR excitation (780-950 nm).

Main Results:

  • Metal doping significantly improves photostability and nonlinear optical properties of Ag25 nanoclusters.
  • Observed a strong second harmonic response with enhanced first hyperpolarizability (β(2ω)).
  • Achieved β(2ω) values one order higher than Au25 nanoclusters, representing the largest reported for ligand-protected nanoclusters.

Conclusions:

  • Metal-doped Ag25 nanoclusters offer superior nonlinear optical scattering properties compared to Au25.
  • These enhanced properties make them highly attractive for advanced bio-imaging applications.
  • The study highlights the potential of controlled metal doping for developing next-generation bio-imaging agents.