Overview
Gold-silver core-shell nanoparticles are hybrid nanostructures consisting of a gold (Au) core encapsulated by a silver (Ag) shell. This architecture combines the chemical stability of gold with the superior plasmonic properties of silver, creating materials with tailored optical and electronic characteristics. The nanoparticles typically range from 10-100 nm in diameter, with shell thickness precisely controlled during synthesis. Their unique structure enables applications where neither pure gold nor silver nanoparticles would be optimal, particularly in fields requiring tunable surface plasmon resonance.
Physical and Chemical Properties
The optical properties of Au@Ag nanoparticles exhibit a distinct plasmonic absorption peak that shifts predictably with silver shell thickness. This tunability allows customization for specific wavelength interactions, making them valuable for colorimetric sensors and photothermal therapy. Chemically, the silver shell provides higher catalytic activity compared to pure gold nanoparticles, while the gold core prevents excessive silver oxidation. The nanoparticles demonstrate improved stability against aggregation compared to pure silver nanoparticles, especially when properly functionalized with stabilizing ligands.
Main Applications
In biomedical fields, these nanoparticles serve as contrast agents for optical imaging and as platforms for surface-enhanced Raman spectroscopy (SERS). Their plasmonic properties enable detection of biomolecules at extremely low concentrations. Industrial applications include catalytic converters, where they show enhanced activity for oxidation reactions. The electronics industry utilizes them in conductive inks for printed electronics, benefiting from their lower cost compared to pure gold nanoparticles while maintaining good conductivity.
Safety and Storage
As with all nanomaterials, proper handling procedures should be followed. Colloidal suspensions are generally safer than dry powders, which may become airborne. Always use appropriate personal protective equipment when handling concentrated forms. For long-term storage, maintain colloidal suspensions in amber glass vials at 4-25°C. Avoid freezing, which may cause aggregation. Shelf life typically ranges from 3-12 months depending on surface functionalization and concentration.
B2B Procurement Guide
When sourcing Au@Ag nanoparticles, clearly specify core diameter (typically 5-50 nm) and desired shell thickness (often 2-20 nm). Reputable suppliers should provide TEM images and UV-Vis spectra for batch verification. For research applications, prioritize suppliers offering small batch customization. Industrial-scale buyers should evaluate synthesis scalability and request pilot samples to test compatibility with their specific application processes. Consider total cost of ownership including any required surface modification steps.
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