scholarly journals SERS Activity of Silver Nanosphere, Triangular Nanoplates, Hexagonal Nanoplates and Quasi-Spherical Nanoparticles: Effect of Shape and Morphology

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 288 ◽  
Author(s):  
Marco Zannotti ◽  
Andrea Rossi ◽  
Rita Giovannetti
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Vinyl Pyrrolidone ◽  
Sers Substrates ◽  
Vis Spectroscopy ◽  
Surface Enhanced Raman ◽  
One Step ◽  
Poly Vinyl Pyrrolidone ◽  
Hexagonal Nanoplates

In this work, we prepared different morphologies of silver nanoparticles: nanosphere, triangular nanoplates, hexagonal nanoplates, and quasi-spherical shapes, through one-step synthesis. Hydrogen peroxide was used as the oxidizing agent during the reduction of silver nitrate by sodium borohydride, in the presence of tri-sodium citrate and poly-vinyl-pyrrolidone. The obtained silver nanoparticles were fully characterized by UV-Vis spectroscopy, Dynamic Light Scattering and Scanning Electron Microscopy, and successfully used as Surface Enhanced Raman Scattering (SERS) substrates. The effect of shape and morphology on the Raman scattering enhancement was evaluated by using methylene blue as target molecules. The Raman measurements demonstrated that the prepared substrates are reliable and sensitive with analytical enhancement factors, estimated to be around 105 with a concentration of methylene blue 1 μM. When triangular and hexagonal nanoplates were tested with different concentrations of analyte, they demonstrated a good linearity in Raman intensity with a good detection of methylene blue 0.1 μM.

Three-Dimensional Surface-Enhanced Raman Scattering Substrate Fabricated Using Chemical Decoration of Silver Nanoparticles on Electrospun Polycarbonate Nanofibers

2016 ◽  
Vol 71 (5) ◽  
pp. 879-887 ◽  
Author(s):  
Murugesan Balamurugan ◽  
Jyisy Yang
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
High Efficiency ◽  
Three Dimensional ◽  
Surface Enhanced Raman Scattering ◽  
Simple Method ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

In this work, a simple method via decoration of silver nanoparticles (AgNPs) on electrospun polycarbonate nanofibers (PCNFs) was proposed to prepare highly sensitive three-dimensional (3D) substrates for surface-enhanced Raman scattering (SERS) measurements. The method proposed in this work gave a high sensitive Ag@PCNFs substrate, which resulted from a successful production of high surface area of PCNFs with a high efficiency in the decoration of AgNPs. To produce PCNFs suitable for SERS application, parameters in fabrication of PCNFs were systematically examined and correlated with their corresponding scanning electron microscope (SEM) images. Examined parameters included the concentration of PC solution, the solvent to form PC solution, the applied voltage, and the rotating speed of a drum collector. Using the optimized condition, the bead-free PCNFs with a diameter in the range of 200–400 nm were successfully produced. To increase the efficiency in decoration of AgNPs, the surface properties of PNCFs were altered with an organic solvent, which was selected experimentally with guidance of Hildebrand solubility parameter. Results indicated that methanol was the most suitable solvent to effectively decorate AgNPs on PCNFs. By probing with para-hydroxythiophenol (pHTP), prepared SERS substrates of Ag@PCNFs provided an enhancement factor to the order of 7, which is at least an order of magnitude larger than the reported values in the literature for SERS substrates prepared with the electrospinning technique.

scholarly journals Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1711
Author(s):  
Monica Quarato ◽  
Ivone Pinheiro ◽  
Ana Vieira ◽  
Begoña Espiña ◽  
Laura Rodriguez-Lorenzo
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Detection Method ◽  
Surface Enhanced Raman Scattering ◽  
Consumer Products ◽  
Method Performance ◽  
Vis Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Nanomaterials significantly contribute to the development of new solutions to improve consumer products properties. Silver nanoparticles (AgNPs) are one of the most used, and as human exposure to such NPs increases, there is a growing need for analytical methods to identify and quantify nanoparticles present in the environment. Here we designed a detection strategy for AgNPs in seawater using surface-enhanced Raman Scattering (SERS). Three commercial AgNPs coated with polyvinylpyrrolidone (PVP) were used to determine the relative impact of size (PVP-15nmAgNPs and PVP-100nmAgNPs) and aggregation degree (predefined Ag aggregates, PVP-50–80nmAgNPs) on the SERS-based detection method. The study of colloidal stability and dissolution of selected AgNPs into seawater was carried out by dynamic light scattering and UV-vis spectroscopy. We showed that PVP-15nmAgNPs and PVP-100nmAgNPs remained colloidally stable, while PVP-50–80nmAgNPs formed bigger aggregates. We demonstrated that the SERS-based method developed here have the capacity to detect and quantify single and aggregates of AgNPs in seawater. The size had almost no effect on the detection limit (2.15 ± 1.22 mg/L for PVP-15nmAgNPs vs. 1.51 ± 0.71 mg/L for PVP-100nmAgNPs), while aggregation caused an increase of 2.9-fold (6.08 ± 1.21 mg/L). Our results demonstrate the importance of understanding NPs transformation in seawater since this can influence the detection method performance.

ZnO/Ag porous nanosheets used as substrate for surface-enhanced Raman scattering to detect organic pollutant

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53524-53528 ◽  
Author(s):  
Kunyu Zhao ◽  
Jie Lin ◽  
Lin Guo
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Hybrid Material ◽  
Organic Pollutant ◽  
Porous Nanosheets ◽  
Surface Enhanced ◽  
Zno Nanosheets ◽  
Surface Enhanced Raman ◽  
One Step ◽  
Enhanced Raman Scattering

Self-assembled porous ZnO nanosheets were fabricated through an one-step solvent method which is convenient and environmentally friendly, and then silver nanoparticles were deposited on to it to make a type of hybrid material.

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