Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-02-28

Journal: NANOSCALE

Included Journals: Scopus、EI、SCIE

Volume: 7

Issue: 8

Page Number: 3445-3452

ISSN: 2040-3364

Abstract: 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.