Improved surface-enhanced Raman scattering of polypyrrole electrodeposited on roughened substrates composed of Au-Ag bimetallic nanoparticles

2005 ◽  
Vol 36 (6-7) ◽  
pp. 704-708 ◽  
Author(s):  
Thomas C. Chuang ◽  
Yu-Chuan Liu ◽  
Chee-Chan Wang
Keyword(s):  
Raman Scattering ◽  
Bimetallic Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) from Au:Ag bimetallic nanoparticles: the effect of the molecular probe

2013 ◽  
Vol 4 (1) ◽  
pp. 509-515 ◽  
Author(s):  
Meikun Fan ◽  
Feng-Ju Lai ◽  
Hung-Lung Chou ◽  
Wan-Ting Lu ◽  
Bing-Joe Hwang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Bimetallic Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Molecular Probe ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A Simple Route to Synthesize Cu@Ag Core–Shell Bimetallic Nanoparticles and Their Surface-Enhanced Raman Scattering Properties

2016 ◽  
Vol 70 (10) ◽  
pp. 1692-1699 ◽  
Author(s):  
Xia Jin ◽  
Aiqin Mao ◽  
Mengling Ding ◽  
Peipei Ding ◽  
Tianchi Zhang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Bimetallic Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Molar Ratio ◽  
Protective Atmosphere ◽  
Core Shell ◽  
Ag Nps ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Water-dispersed Cu@Ag core–shell nanoparticles (NPs) with 15 nm-diameter Cu core and 5 nm-thick Ag shell can be synthesized by a facile one-step chemical reduction at room temperature without any protective atmosphere. To obtain a homogeneous Ag coating on Cu, the influence of [Cu/Ag] molar ratio was investigated. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) confirmed that Ag formed a dense coating on the surface of Cu, and that phase-pure spherical Cu@Ag core–shell bimetallic NPs were prepared when the [Cu/Ag] molar ratio was between 1/0.5 and 1/0.75. The time dependence of ultraviolet-visible (UV-Vis) spectra and XRD patterns of six-month stored Cu@Ag NPs showed that the as-prepared Cu@Ag NPs have a long-term antioxidant activity. Also, the surface-enhanced Raman scattering (SERS) signals had a high stability and reproducibility for the substrates. Hence, the as-prepared Cu@Ag nanostructures can be used as an efficient substrate for SERS signals.

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