Ag@Au core-shell dendrites: a stable, reusable and sensitive surface enhanced Raman scattering substrate

Surface enhanced Raman scattering (SERS) substrate based on fabricated Ag@Au core-shell dendrite was achieved. Ag dendrites were grown on Si wafer by the hydrothermal corrosion method and Au nanofilm on the surface of Ag dendritic nanostructure was then fabricated by chemical reduction. With the hel...

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Bibliographic Details
Published in:Scientific reports 2015-09, Vol.5 (1), p.14502-14502, Article 14502
Main Authors: Jun Yin, Hong, Yang Chen, Zhao, Mei Zhao, Yong, Yang Lv, Ming, An Shi, Chun, Long Wu, Zheng, Zhang, Xin, Liu, Luo, Li Wang, Ming, Jun Xu, Hai
Format: Article
Language:English
Subjects:
639/624/400/1021
639/638/11/511
Adenine
Anions
Chemical reduction
Corrosion
Dendrites
Electric fields
Guanine
Humanities and Social Sciences
Microscopy
multidisciplinary
Nanoparticles
Oxidation
Polymers
Rhodamine
Science
Single-stranded DNA
Sodium
Substrates
Vinylpyrrolidone
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Summary:Surface enhanced Raman scattering (SERS) substrate based on fabricated Ag@Au core-shell dendrite was achieved. Ag dendrites were grown on Si wafer by the hydrothermal corrosion method and Au nanofilm on the surface of Ag dendritic nanostructure was then fabricated by chemical reduction. With the help of sodium borohydride in water, Au surface absorbates such as thiophene, adenine, rhodamine, small anions (Br – and I – ) and a polymer (PVP, poly(N-vinylpyrrolidone)) can be completely and rapidly removed. After four repeatable experiments, the substrate SERS function did not decrease at all, indicating that the Ag@Au dendrite should be of great significance to SERS application because it can save much resource. Six-month-duration stability tests showed that the Ag@Au core-shell dendrite substrate is much more stable than the Ag dendrite substrates. We have also experimented on fast detection of Cd 2+ at 10 −8  M concentration by decorating single-stranded DNA containing adenine and guanine bases on the surface of this Ag@Au dendrite. Finite-difference time-domain simulations were carried out to investigate the influence of Au nanolayer on Ag dendrites, which showed that the local electric fields and enhancement factor are hardly affected when a 4 nm Au nanolayer is coated on Ag dendrite surface.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep14502