Preparation of Au–Ag, Ag–Au core–shell bimetallic nanoparticles for surface-enhanced Raman scattering

2008 ◽  
Vol 58 (10) ◽  
pp. 862-865 ◽  
Author(s):  
Yong Yang ◽  
Jianlin Shi ◽  
Go Kawamura ◽  
Masayuki Nogami
Keyword(s):  
Raman Scattering ◽  
Bimetallic Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Core Shell ◽  
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.

Bifunctional Au@Pt core–shell nanostructures for in situ monitoring of catalytic reactions by surface-enhanced Raman scattering spectroscopy

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 9063-9070 ◽  
Author(s):  
Zhi Yong Bao ◽  
Dang Yuan Lei ◽  
Ruibin Jiang ◽  
Xin Liu ◽  
Jiyan Dai ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
In Situ Monitoring ◽  
Core Shell ◽  
Raman Scattering Spectroscopy ◽  
Shell Nanostructures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering spectroscopy using bifunctional Au@Pt core–shell nanostructures can monitor the catalytic reaction dynamics in real time.

scholarly journals Performance Improving Method of Aligned Silver Nanorod by Grafting Au@Ag Core–Shell Nanoparticles for Surface-Enhanced Raman Scattering

NANO ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. 1750131 ◽  
Author(s):  
Jian Chen ◽  
Peitao Dong ◽  
Chaoguang Wang ◽  
Chenyu Zhang ◽  
Junfeng Wang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Core Shell ◽  
Sers Substrate ◽  
Shell Nanoparticles ◽  
Simple Method ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Core Shell Nanoparticles

A simple method for improving surface-enhanced Raman scattering (SERS) performance of aligned silver nanorod (Ag NR) array was investigated. This method was to construct a kind of hybrid substrate by grafting Au@Ag core–shell nanoparticles (NPs) into Ag NR array using poly(2-vinylphridine) (P2VPy) as a bridging agent. The hybrid substrate yielded excellent SERS performance as its detection limit improved from 10[Formula: see text] M to 10[Formula: see text] M using trans-1,2-bis(4-pyridyl)ethylene (BPE) as probe molecule, which was increased by two orders of magnitude compared with Ag NR array substrate. The significant improvement of SERS performance of Ag NR arrays was attributed to the addition of Au@Ag core–shell NPs. As a result of surface plasmon resonance generated by the interaction of electromagnetic (EM) (IAEM) filed between NP and NR structures, increasing hotspots were found at the connections of NPs and NRs, the gaps of adjacent rods, and the gaps of two particles consequently. These results were validated by the finite difference time domain (FDTD) calculation. Besides, hybrid substrate shows good performance in stability and reproducibility. The proposed method was simple and robust, which promoted SERS performance of Ag NR array effectively, showing great potential in the application of SERS substrate fabrication and SERS-based bio-chemical sensing.

scholarly journals Fabrication and Characterization of a Highly-Sensitive Surface-Enhanced Raman Scattering Nanosensor for Detecting Glucose in Urine

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 629 ◽  
Author(s):  
Yudong Lu ◽  
Ting Zhou ◽  
Ruiyun You ◽  
Yang Wu ◽  
Huiying Shen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Internal Standard ◽  
Surface Enhanced Raman Scattering ◽  
Quantitative Detection ◽  
Core Shell ◽  
Ag Nps ◽  
Vis Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Herein we utilized coordination interactions to prepare a novel core-shell plasmonic nanosensor for the detection of glucose. Specifically, Au nanoparticles (NPs) were strongly linked with Ag+ ions to form a sacrificial Ag shell by using 4-aminothiophenol (4-PATP) as a mediator, which served as an internal standard to decrease the influence of the surrounding on the detection. The resultant Au-PATP-Ag core-shell systems were characterized by UV-vis spectroscopy, transmission electron microscopy, and surface-enhanced Raman scattering (SERS) techniques. Experiments performed with R6G (rhodamine 6G) and CV (crystal violet) as Raman reporters demonstrated that the Au@Ag nanostructure amplified SERS signals obviously. Subsequently, the Au@Ag NPs were decorated with 4-mercaptophenylboronic acid (4-MPBA) to specifically recognize glucose by esterification, and a detection limit as low as 10−4 M was achieved. Notably, an enhanced linearity for the quantitative detection of glucose (R2 = 0.995) was obtained after the normalization of the spectral peaks using 4-PATP as the internal standard. Finally, the practical applicability of the developed sensing platform was demonstrated by the detection of glucose in urine with acceptable specificity.

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
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