Search results for "surface enhanced raman spectroscopy"

showing 3 items of 3 documents

Optical determination and identification of organic shells around nanoparticles: application to silver nanoparticles

2013

We present a simple method to prove the presence of an organic shell around silver nanoparticles. This method is based on the comparison between optical extinction measurements of isolated nanoparticles and Mie calculations predicting the expected wavelength of the Localized Surface Plasmon Resonance of the nanoparticles with and without the presence of an organic layer. This method was applied to silver nanoparticles which seemed to be well protected from oxidation. Further experimental characterization via Surface Enhanced Raman Spectroscopy (SERS) measurements allowed to identify this protective shell as ethylene glycol. Combining LSPR and SERS measurements could thus give proof of both …

inorganic chemicalsMaterials scienceMie scatteringeducationSilver nanoparticleShell (structure)FOS: Physical sciencesNanoparticlePhysics::Optics02 engineering and technology010402 general chemistry01 natural sciencesSilver nanoparticlesurface enhanced raman spectroscopychemistry.chemical_compoundlocalized surface plasmon resonanceMesoscale and Nanoscale Physics (cond-mat.mes-hall)Physics::Atomic and Molecular ClustersMie theoryGeneral Materials ScienceSurface plasmon resonancehealth care economics and organizationsPlasmonCondensed Matter - Materials ScienceCondensed Matter - Mesoscale and Nanoscale Physicstechnology industry and agricultureMaterials Science (cond-mat.mtrl-sci)Surface-enhanced Raman spectroscopy021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical scienceschemistryChemical engineering[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonicorganic shells0210 nano-technologyEthylene glycol
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Study of the dynamics of biomolecules by high speed atomic force microscopy and surface enhanced Raman spectroscopy

2015

This thesis focuses on the coupling of High–Speed Atomic Force Microscopy (HS-AFM) and Surface Enhanced Raman Spectroscopy (SERS) for biomolecule analysis. We have designed a fabrication protocol to manufacture “SERS-active” substrates. The efficacy of gold, silver and gold-silver bimetallic crystalline nanoparticle substrates were evaluated. We have investigated the impact of optical and morphological features of the substrates on Raman signal intensity by analyzing well-known samples such as bipyridine ethylene and methylene blue molecules. We took an interest in three distinct biological problematics with HS-AFM and SERS analyses. First, we have detected the chemical signature of cytochr…

Tip–Enhanced Raman Spectroscopy (TERS)Surface Enhanced Raman Spectroscopy (SERS)CellsProteinsDetergent resistant membrane domains (DRMs)ProtéinesSpectroscopie Raman exaltée de surface (SERS)Nanoparticle substratesNoroviruses (NoVs)Substrats de nanoparticulesHigh–Speed Atomic Force Microscopy (HS-AFM)Microscopie à force atomique haute-vitesse (HS-AFM)Diffusion Raman exaltée par effet de pointe (TERS)Détergent résistant membrane domaines (DRMs)Plasmons de Surface Localisé (LSP)Cellules[PHYS.PHYS] Physics [physics]/Physics [physics]Localized Surface Plasmons (LSP)
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Ag nanoparticles agargel nanocomposites for SERS detection of cultural heritage interest pigments

2018

Agarose gel (agargel) composites with commercial and laboratory made silver nanoparticles were prepared by a wet solution method at room temperature. The gel composites were used for pigment extraction and detection by Raman spectroscopy. Red (alizarin) and violet (crystal violet) pigments deposited on paper were extracted by the composites and were investigated by micro-Raman spectroscopy. Evaluation was carried out of the surface-enhanced Raman spectroscopy (SERS) effect induced by the silver nanoparticles embedded in the gel. A kinetic approach as a function of time was used to determine the efficiency of pigments extraction by composites deposition. A non-invasive extraction process of …

Materials scienceNanocompositeExtraction (chemistry)General Physics and Astronomy02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyAlizarin01 natural sciencessers cultural heritage raman spectroscopySilver nanoparticle0104 chemical scienceschemistry.chemical_compoundsymbols.namesakechemistrySurface Enhanced Raman Spectroscopy Cultural Heritage pigmentssymbolsAgarosesense organsCrystal violet0210 nano-technologyRaman spectroscopySpectroscopyNuclear chemistryThe European Physical Journal Plus
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