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Core-shell gold/silver nanoparticles: synthesis and optical properties.

Lu Lu¹, Gwendolyn Burkey¹, Ionel Halaciuga¹

¹Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA.

Journal of Colloid and Interface Science

|November 7, 2012

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Synthesized gold-silver core-shell nanoparticles using a two-step method. Chloride ion concentration critically influences nanoparticle stability and silver shell structure for enhanced optical properties.

Area of Science:

Nanotechnology
Materials Science
Physical Chemistry

Background:

Gold-silver core-shell nanoparticles offer tunable optical properties.
Controlling shell thickness and composition is crucial for applications.
Stabilizer-free synthesis presents challenges in maintaining dispersion.

Purpose of the Study:

To develop a reproducible method for synthesizing highly dispersed gold-silver core-shell nanoparticles.
To investigate the effect of silver shell thickness on optical properties.
To determine the role of chloride ion concentration in synthesis and stability.

Main Methods:

Two-step synthesis involving gold core formation via ascorbic acid reduction of HAuCl(4).
Controlled deposition of silver shells by reducing silver nitrate in gold sol.

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Characterization of plasmonic properties and structural analysis.

Main Results:

Achieved stabilizer-free gold nanoparticles (~30 nm) with subsequent continuous silver shell formation.
Observed a blue shift in the gold plasmon band and emergence of a silver band with increasing silver content.
A distinct silver absorption band appeared above 60 wt.% silver.
Identified chloride ion concentration as a critical factor for sol stability and shell structure.

Conclusions:

The synthesis method allows for controlled formation of gold-silver core-shell nanoparticles.
Optical properties are tunable by adjusting silver shell thickness.
Chloride ion concentration is a key parameter for successful synthesis and stability of bimetallic sols.