Journal
NANOSCALE
Volume 7, Issue 8, Pages 3445-3452Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr06756h
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Funding
- ARC [DP120100170, DP140100052]
- Australian Research Council [DP110100713, DP140100883]
- DSDBI of the Victorian Government
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We report on a robust nanotemplating approach to synthesize plasmonic multilayered core-satellite (MCS) nanoassemblies. Templated with gold nanorods, ultrathin Au/Ag alloy cages and satellite gold nanoparticles can be constructed sequentially by galvanic replacement reactions and electrostatic self-assembly, respectively, forming structurally well-defined MCS. The MCS nanoassemblies exhibit strong broadband plasmon resonances from similar to 440 to similar to 1100 nm, and their resonant features can be fine-tuned by adjusting the size and number density of satellite nanoparticles and by adjusting the thickness of the silica spacer between cage and satellite particles. Such fine-engineered MCS nanoassemblies enable precise programming of the strength and distribution of hot spots to maximize the overall enhancement of surface enhanced Raman scattering.
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