Ultrasensitive Characterization of the Prion Protein by Surface-Enhanced Raman Scattering: Selective Enhancement via Electrostatic Tethering of the Intrinsically Disordered Domain with Functionalized Silver Nanoparticles

2021 ◽  
pp. 3187-3194
Author(s):  
Swapnil Singh ◽  
Aishwarya Agarwal ◽  
Anamika Avni ◽  
Samrat Mukhopadhyay
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Prion Protein ◽  
Surface Enhanced Raman Scattering ◽  
Intrinsically Disordered ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Selective Enhancement

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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