Revisiting the mechanism and the influence of the excitation wavelength on the surface-enhanced Raman scattering of the pyridine–Ag20 system

2015 ◽  
pp. 113-125
Author(s):  
Nicolás Ramos-Berdullas ◽  
Diego López-Carballeira ◽  
Marcos Mandado ◽  
Ignacio Pérez-Juste
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Excitation Wavelength ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals A Review on Surface-Enhanced Raman Scattering

Biosensors ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 57 ◽  
Author(s):  
Pilot ◽  
Signorini ◽  
Durante ◽  
Orian ◽  
Bhamidipati ◽  
...  
Keyword(s):  
Raman Scattering ◽  
High Sensitivity ◽  
Surface Enhanced Raman Scattering ◽  
Fingerprint Recognition ◽  
Excitation Wavelength ◽  
User Friendliness ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
The Cost

Surface-enhanced Raman scattering (SERS) has become a powerful tool in chemical, material and life sciences, owing to its intrinsic features (i.e., fingerprint recognition capabilities and high sensitivity) and to the technological advancements that have lowered the cost of the instruments and improved their sensitivity and user-friendliness. We provide an overview of the most significant aspects of SERS. First, the phenomena at the basis of the SERS amplification are described. Then, the measurement of the enhancement and the key factors that determine it (the materials, the hot spots, and the analyte-surface distance) are discussed. A section is dedicated to the analysis of the relevant factors for the choice of the excitation wavelength in a SERS experiment. Several types of substrates and fabrication methods are illustrated, along with some examples of the coupling of SERS with separation and capturing techniques. Finally, a representative selection of applications in the biomedical field, with direct and indirect protocols, is provided. We intentionally avoided using a highly technical language and, whenever possible, intuitive explanations of the involved phenomena are provided, in order to make this review suitable to scientists with different degrees of specialization in this field.

scholarly journals Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

2021 ◽  
Vol 12 ◽  
pp. 497-506
Author(s):  
Paulina Filipczak ◽  
Krzysztof Hałagan ◽  
Jacek Ulański ◽  
Marcin Kozanecki
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Excitation Wavelength ◽  
Water Molecules ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Average Size ◽  
Selective Enhancement

The resonance Raman effect (RRE) is a phenomenon which results in a strong selective enhancement of Raman signals from the samples. Previous studies showed that the RRE in liquid water directly corresponds to its supramolecular structure. It was also reported that the electric-field-induced orientation of water molecules on the electrode surface results in the surface-enhanced Raman scattering (SERS) effect. In this work, we show the SERS effect for water molecules in the dispersion of silver nanoparticles (AgNPs) without any external electrical field. An enhancement factor was estimated to be (4.8 ± 0.8) × 106 for an excitation wavelength of 514.5 nm and for AgNPs with an average size of 34 ± 14 nm. The temperature experiment results showed a higher enhancement with temperature increase. Performed simulation studies revealed a slowdown of the mobility of the water molecules close to the surface of AgNPs.

Investigation of charge transfer at the TiO2–MBA–Au interface based on surface-enhanced Raman scattering: SPR contribution

2018 ◽  
Vol 20 (8) ◽  
pp. 5666-5673 ◽  
Author(s):  
Rui Han ◽  
Wei Song ◽  
Xu Wang ◽  
Zhu Mao ◽  
Xiao Xia Han ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Excitation Wavelength ◽  
Interfacial Charge Transfer ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Interfacial Charge

Investigation of SPR contribution to interfacial charge transfer by tuning the SPR of the assemblies and excitation wavelength.

A facile surface enhanced Raman scattering substrate based on silver deposited sandpaper

2019 ◽  
Vol 33 (21) ◽  
pp. 1950239 ◽  
Author(s):  
Dongdong Yuan ◽  
Shu Chen ◽  
Yanan Wu ◽  
Junqiao Wang
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Excitation Wavelength ◽  
Enhancement Effect ◽  
Sers Substrate ◽  
Sers Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Flexible surface enhanced Raman scattering (SERS) substrate was prepared by modification of sandpaper with silver nanoparticles. Under 633 nm excitation wavelength, the SERS enhancement effect of sandpapers which were treated with silver nanoparticles were evaluated by collecting Raman signals of probed molecules. The results demonstrate that the SERS enhancement effect of white (12,000 meshes) is better than that of pink (8000 meshes) sandpaper under the same condition; when the concentration of probe molecules is [Formula: see text] mol/L, white sandpaper has the best SERS enhancement; the Raman scattering spectrum has better signal when the silver sol is 15 [Formula: see text].

Surface-Enhanced Raman Scattering Based on Au-DNA-Ag Plasmonic Nanoparticles

2020 ◽  
Vol 15 (11) ◽  
pp. 1307-1311
Author(s):  
Seyed Enayatollah Taghavi Moghaddam ◽  
Farzin Emami
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Excitation Wavelength ◽  
Nano Particle ◽  
Gold And Silver Nanoparticles ◽  
Gold Silver ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The dependence of the Surface-Enhanced Raman Scattering (SERS) by gold and silver nanoparticles on their shape is examined using the organic dye, as a probe molecule. SERS has been explored extensively for applications in sensing and imaging, but the design and optimization of efficient substrates are still challenging. In order to understand and optimize the SERS process in nanoparticles, gold and silver Nanospheres and their composition as gold-DNA-silver nanoparticle were synthesized and characterized according to their average size, zeta potential and UV/visible absorption. In fact, in this research, an asymmetric new plasmonic nano-particle is proposed and designed as gold-DNA-silver and is compared to gold, silver, gold-DNA-gold, and silver-DNA-silver nanoparticles. With the help of this new nanoparticle, we design and recommend a Raman booster so that the effect of Raman is improved noticeably. It will be shown that using the proposed asymmetric nano-particle of gold-DNA-silver, the absorbance, and intensity of Raman booster is improved noticeably. In suspensions of equal nano-particle and dye concentration, the SERS effect increases as gold- DNA-silver, clearly indicating that control over the number of local field hotspots can optimize the SERS efficiency. Notably, it is demonstrated that the SERS intensity per nanoparticle scales with the magnitude of the SPR absorbance at the excitation wavelength (785 nm), providing a clear guide to optimization of the process experimentally.

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