March 15, 2003Nano Letters
Triangular Nanoframes Made of Gold and Silver
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Implication
Experimental study demonstrates controlled galvanic etching and back-filling of silver nanoprisms into gold-silver nanoframes, indicating tunable optical and plasmonic properties.
Key Points
- Synthesize triangular gold-silver alloy nanoframes from silver nanoprisms and evaluate the reversible restoration of their structure and plasmonic characteristics.
- Etched silver nanoprisms (~74-nm edge length) with HAuCl4 to fabricate hollow gold-silver alloy framework structures.
- Introduced L-ascorbic acid as a mild reducing agent to reduce residual gold and silver ions in solution for controlled back-filling and metal plating.
- Analyzed the resulting structural evolution and surface plasmon extinction profiles across the ultraviolet-visible spectrum.
- Galvanic etching generated triangular alloy nanoframes that lacked strong surface plasmon bands in the ultraviolet and visible regions.
- Controlled reduction with L-ascorbic acid enabled back-filling into nanoporous or fully reformed prisms, accompanied by the regeneration of UV-vis surface plasmon bands.
Cite This Study
Métraux et al. (2003) studied this question.