Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 1, Pages 126-132Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c04203
Keywords
core-shell structures; yolk-shell structures; nanorattles; gold nanoarrows; galvanic replacement; plasmonic nanostructures; SERS
Funding
- NSFC [22132001, 22161142023, 21972004]
- Ministry of Science and Technology of China [2018YFA0703502]
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Precise control over the structure and morphology of plasmonic nanoparticles is important for their desired properties and applications. This study demonstrates the synthesis of arrow-shaped and cuboidal GNA@Ag core-shell nanoparticles, as well as arrow-shaped and cuboidal GNA@AuAg yolk-shell nanoparticles. The arrow-shaped GNA@AuAg yolk-shell nanoparticles show excellent solution-based SERS sensing capability.
Precise control over the structure and morphology of core-shell and yolk-shell plasmonic nanoparticles is crucial to the realization of the desired plasmonic properties and promising applications. In this work, uniform arrow-shaped and cuboidal GNA@Ag core-shell nanoparticles were prepared via seed-mediated epitaxial growth, and the subsequent galvanic replacement combined with coreduction led to the formation of unique arrow-shaped and cuboidal GNA@AuAg yolk-shell nanoparticles. The obtained GNA@Ag nanoparticles and GNA@AuAg nanorattles show distinct plasmonic absorption features. The GNA@ AuAg nanorattles exhibit an excellent solution-based SERS sensing capability due to the existence of rich intragaps and sharp features, with the arrow-shaped nanorattles showing superior performance.
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