Surface‐enhanced Raman scattering from plasmonic Ag‐nanocube@Au‐nanospheres core@satellites. (14th September 2016)

• Record Type: Journal Article
• Authors: Huang, Zhulin; Meng, Guowen; Huang, Qing; Chen, Bin; Lu, Yilin; Wang, Zhaoming; Zhu, Xiaoguang; Sun, Kexi
• Is Part Of: Journal of Raman spectroscopy. Volume 48:Number 2(2017)
• Page Start: 217
• Page End: 223
• Publication Date: 2016-09-14
• Subjects: core@satellites -- Ag‐nanocube -- Au‐nanosphere -- hot spots -- SERS; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.5032
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract : 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. Abstract : Owning to the hot spots from sharp edged Ag‐nanocube and nanoscaled gaps between the Au‐nanosphere satellites and Ag‐nanocube cores, the Raman enhancement factor of singular Ag‐nanocube@Au‐nanospheres core@satellites analogue can be up to 3.4 × 10 8, while that of a Ag‐nanocube is 1.5 × 10 8 .