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Surface‐enhanced Raman scattering from plasmonic Ag‐nanocube@Au‐nanospheres core@satellites
Author(s) -
Huang Zhulin,
Meng Guowen,
Huang Qing,
Chen Bin,
Lu Yilin,
Wang Zhaoming,
Zhu Xiaoguang,
Sun Kexi
Publication year - 2017
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5032
Subject(s) - raman scattering , raman spectroscopy , plasmon , materials science , core (optical fiber) , nanotechnology , chemistry , optoelectronics , optics , physics , composite material
Plasmonic core@satellites nanostructures comprising strongly coupled Au‐nanoparticles as building blocks have drawn a lot of attention because of the optical application, e.g. surface‐enhanced Raman scattering (SERS) based signal amplification. However, little has been reported on the core@satellites structures related to Ag‐nanoparticles and the SERS enhancement from a singular core@satellites assembling. Here, we show the DNA assisted assembly of core@satellites, consisting of Ag‐nanocube core and small Au‐nanosphere satellites. For each core@satellites unit, an Ag‐nanocube as a core is assembled with randomly distributed Au‐nanospheres as satellites. In this way, abundant hot spots are formed at the sharp edged Ag‐nanocube and the nanoscaled gaps between the Ag‐nanocube core and the Au‐nanosphere satellite. Raman measurements, atomic force microscope correlated Raman measurements and finite element modeling demonstrate that the Raman enhancement factor of the singular Ag‐nanocube@Au‐nanospheres core@satellites can be up to 3.4 × 10 8 . The Ag‐nanocube@Au‐nanoparticles core@satellites with in‐built electromagnetic hot‐spots could be used as excellent SERS substrates for rapid ultrasensitive detection of organic pollutants in the environment. Copyright © 2016 John Wiley & Sons, Ltd.