Study of Signal-to-Background Ratio of Surface-Enhanced Raman Scattering: Dependences on Excitation Wavelength and Hot-Spot Gap

2017 ◽  
Vol 121 (47) ◽  
pp. 26438-26445 ◽  
Author(s):  
Mykhaylo M. Dvoynenko ◽  
Huai-Hsien Wang ◽  
Hui-Hsin Hsiao ◽  
Yuh-Lin Wang ◽  
Juen-Kai Wang
Keyword(s):  
Raman Scattering ◽  
Hot Spot ◽  
Surface Enhanced Raman Scattering ◽  
Excitation Wavelength ◽  
Background Ratio ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Novel Ag/Au/Pt trimetallic nanocages used with surface-enhanced Raman scattering for trace fluorescent dye detection

2014 ◽  
Vol 2 (34) ◽  
pp. 5550-5557 ◽  
Author(s):  
Tran Thi Bich Quyen ◽  
Wei-Nien Su ◽  
Ching-Hsiang Chen ◽  
John Rick ◽  
Jyong-Yue Liu ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Hot Spot ◽  
Surface Enhanced Raman Scattering ◽  
Signal Enhancement ◽  
Fluorescent Dye ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Hot Spot Formation ◽  
Spot Formation

Trimetallic nanocages possess inter-metallic synergies among elements and are able to generate significant SERS signal enhancement due to “hot spot” formation.

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.

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