Literatura académica sobre el tema "Spectroscopie Raman exaltée en surface"
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Artículos de revistas sobre el tema "Spectroscopie Raman exaltée en surface"
Boubekeur-Lecaque, Leïla, Nordin Felidj y Marc Lamy de la Chapelle. "Comprendre. La diffusion Raman exaltée de surface". Photoniques, n.º 90 (enero de 2018): 41–44. http://dx.doi.org/10.1051/photon/20189041.
Texto completoFelidj, Nordin. "Introduction à la spectroscopie Raman classique et à la diffusion Raman exaltée de surface". Photoniques, n.º 96 (mayo de 2019): 39–42. http://dx.doi.org/10.1051/photon/20199639.
Texto completoFelidj, Nordin. "Introduction à… La spectroscopie Raman et la diffusion exaltée de surface". Photoniques, n.º 81 (abril de 2016): 46–49. http://dx.doi.org/10.1051/photon/20168146.
Texto completoDowek, Antoine, Laetitia Lê, Anais Amar y Eric Caudron. "Diffusion Raman exaltée de surface (SERS) appliquée à l’analyse du 5-fluorouracile". Le Pharmacien Hospitalier et Clinicien 54, n.º 1 (marzo de 2019): 104. http://dx.doi.org/10.1016/j.phclin.2018.10.054.
Texto completoAwada, Chawki y Hassan Traboulsi. "Effect of pH and Nanoparticle Capping Agents on Cr (III) Monitoring in Water: A Kinetic Way to Control the Parameters of Ultrasensitive Environmental Detectors". Micromachines 11, n.º 12 (27 de noviembre de 2020): 1045. http://dx.doi.org/10.3390/mi11121045.
Texto completoBergeron, Alaric, Clément Gradziel, Richard Leonelli y Sébastien Francoeur. "Probing hyperbolic and surface phonon-polaritons in 2D materials using Raman spectroscopy". Nature Communications 14, n.º 1 (11 de julio de 2023). http://dx.doi.org/10.1038/s41467-023-39809-3.
Texto completoQian, F., R. K. Singh, S. Dutta, P. P. Pronko y W. H. Weber. "Femtosecond Laser Deposition of Diamond-Like Carbon Films". MRS Proceedings 397 (1995). http://dx.doi.org/10.1557/proc-397-297.
Texto completoTesis sobre el tema "Spectroscopie Raman exaltée en surface"
Delhaye, Caroline. "Spectroscopie Raman et microfluidique : application à la diffusion Raman exaltée de surface". Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13927/document.
Texto completoThis thesis focuses on the development of a microfluidic platform coupled with confocal Raman microscopy, used in excitation conditions of Raman scattering (Surface enhanced Raman scattering, SERS) in order to gain in the detection sensitivity of molecular species flowing in channels of micrometer dimensions. This work aims to demonstrate the feasibility of coupling Raman microscopy / microfluidics for the in situ and local characterization of species and reactions taking place in the fluid flowing in microchannels. We used a T-shaped microchannel, made by soft lithography, in which gold or silver nanoparticles injected at constant speed, in one of the two branches of the channel and a solution of pyridine or pefloxacin in the other one. The laminar flow and the stationarity of the process allowed us to map the mixing zone and highlight the enhancement of the Raman signal of pyridine and pefloxacin, due to the metallic nanoparticles, in the interdiffusion zone. The recording of the both absorption band of the silver nanoparticles (plasmon band) and the Raman signal of pefloxacin, flowing in microchannel, allowed us to establish a link between the shape of the metallic nanostructure, and more precisely the silver nanoparticle aggregation state, and the enhancement of the Raman signal of pefloxacin observed. We then changed the channel geometry to introduce an electrolyte solution (NaCl and NaNO3) and locally modify the surface charge of the colloids. We have put in evidence that the change of the silver nanoparticle aggregation state, induced by the controlled addition of electrolyte solutions, could amplify the SERS signal of pefloxacin and thus optimizing the detection in microfluidics. At last, we established second a approach that consists in the metallic structuring of microchannel walls. This has shown that the surface chemical functionalization through organosilanes (APTES) allowed the pasting of the channel with silver nanoparticles, thus amplifying the Raman signal of the species flowing within the same microchannel
Haidar, Israa. "Nouvelles plateformes plasmoniques pour la spectroscopie Raman exaltée de surface". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC307.
Texto completoThe design of novel plasmonic platforms for Surface Enhanced Raman Spectroscopy (SERS) constitutes a very active field of research in nanosciences. Such platforms can be used for the detection and identification of various analytes at very low concentration, through a huge amplification of the Raman signal, resulting from the excitation of localized surface plasmon resonances. The main objective of my phd is to develop and to characterize new SERS substrates obtained by chemical assembly (surface functionalization) of nanoparticles with controlled hot spots. Design of such substrates contributes to a better understanding of the mechanisms of electromagnetic enhancement considered at the origin of the SERS effect
Julien, Carine. "Fluorescence et Diffusion Raman exaltée de surface (SERS) de molécules individuelles". Phd thesis, Université Paris Sud - Paris XI, 2004. http://tel.archives-ouvertes.fr/tel-00011564.
Texto completoPar microscopie grand champ de fluorescence, l'émission de molécules uniques de pérylène orange insérées dans un film solgel mince, par enregistrement de films d'une large zone de l'échantillon sur laquelle plus d'une centaine d'émetteurs individuels sont détectés, fournit des informations sur cette espèce et la matrice sondée. Pour exploiter les films, un outil logiciel a été développé. Les processus de photoblanchiment, la mobilité moléculaire, la nucléation des molécules excitées sont mis en évidence et discutés. On note une grande richesse des dynamiques temporelles d'émission, mais aussi des spectres qui reflètent notamment la reconformation proposée du pérylène orange excité. Il s'ensuit l'existence de nombreux nanoenvironnements différents dans la matrice poreuse.
Par microscopie confocale à balayage, le signal de diffusion Raman exaltée de surface de molécules uniques organique adsorbées sur des agrégats d'argent de morphologie complexe est exploité. Certains objets présentent une exaltation géante, estimée être de plus de 14 ordres de grandeur, ce qui permet l'enregistrement de spectres résolus en seulement une seconde. L'analyse chimique offerte permet de distinguer différentes espèces, et la présence nécessaire sur ces points chauds d'Ag+ est démontrée. Une caractérisation corrélée par microscopie électronique des agrégats actifs repérés met aussi en avant l'existence d'une morphologie privilégiée, avec de nombreuses protubérances de dimension nanométrique et interstices.
Le, Nader Victor. "Approche expérimentale et théorique de la diffusion Raman exaltée : résonance des plasmons de surface et effet de pointe". Phd thesis, Université de Nantes, 2010. http://tel.archives-ouvertes.fr/tel-00559365.
Texto completoMakiabadi, Tahereh. "Étude de surfaces nanostructurées : applications à la spectroscopie Raman exaltée de surface et à la résonance de plasmons localisés". Nantes, 2010. http://archive.bu.univ-nantes.fr/pollux/show.action?id=eb8aaf03-cd71-46c6-a427-2c4cf47a3a49.
Texto completoThe objectives of this work are the realization, characterization and optimization of nanostructured surfaces, e. G. Substrates for the surface-enhanced Raman spectroscopy and the surface plasmon resonance. Several main contributions were performed. The first one is based on the grafting of silver and gold nanoparticles on functionalized supports. Our bottomup approach enabled us to highlight the optimal conditions to obtain a mono-layer of nanoparticles, with homogeneous distribution and an important density. The curves of extinction and factors of exaltation were quantified and modeled. Also, the manufacturing time was optimized. The second contribution, which is based on a top-down approach, consists of making nanostructures by electro erosion of a thin film of silver or gold, carried out by physical deposit in vapor phase. This procedure, which relies on the optimization of oxidation-reduction cycle (ORC), was employed to realize rough films and metal nanostructures. The presence of nanostructures and the nano cavities on the substrates were confirmed by scanning electron microscopy (SEM) atomic force microscopy (AFM). The limit of detection by Raman spectrometry was evaluated at 1nM. The optimal conditions obtained from the curves of extinction and Raman scattering made it possible to converge towards a reliable and reproducible manufacturing protocol. The third contribution is the deposit of nanoparticles on optical fibers in order to evaluate the sensitivity of the localized surface plasmon resonance (LSPR)
Yazidi, Senda. "Structure et propriétés optiques de nanoparticules couplées : application à la spectroscopie Raman exaltée de surface". Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2279/document.
Texto completoThe aim of this work is to use nanostructured alumina surfaces to guide the growth and to optimize the organization of metallic particles (Ag, Au and AgxAu1-x), and to test those systems as reusable SERS-active substrates. We used spectrophotometry to characterize the resulting optical properties, spectroscopic ellipsometry for the determination of the optical index and transmission electron microscopy for the structural characterizations. Surfaced-enhanced Raman spectroscopy (SERS) was used for the detection of adsorbed bipyridine molecules on the sample surface, in collaboration with the Institut des Matériaux Jean Rouxel at Nantes. We first study systems consisting of monometallic and bimetallic nanoparticles in order to understand the growth modes of such particle assemblies. A particular attention is paid to the influence of the sequential deposition of Au and Ag on the structural and optical properties. We show that different arrangements of bimetallic nanoparticles are obtained according to the deposition sequence used and that an alloy is obtained after ex situ annealing under vacuum. The near-field and far-field optical properties of AgxAu1-x nanoparticle alloys embedded in an alumina matrix are compared numerically by the finite difference time domain method, with those of pure metal nanoparticles. Our results indicate that pure metal nanoparticles exhibit a greater field enhancement than alloy nanoparticles. Finally, SERS experiments conducted with a dichroic system made of coupled Ag nanoparticles show that an intense SERS signal can be obtained with coated nanoparticles
Grand, Johan. "Plasmons de surface de nanoparticules : spectroscopie d'extinction en champs proche et lointain, diffusion Raman exaltée". Troyes, 2004. http://www.theses.fr/2004TROY0014.
Texto completoThe intrinsic weakness of the Raman process makes its application in a near field optical experiment rather difficult. Thus, as a first step towards near field Raman spectroscopy, we studied Surface-Enhanced Raman Scattering (SERS), a technique that enables the detection of very low concentration of molecules adsorbed on rough metallic surfaces. For the purpose of the near field experiments, these SERS-active samples have to be reproducible and yield good enhancement factors. By designing metallic nanoparticle grating through electron beam lithography, we manage to vary the shape, size and arrangement of the particles, hence enabling a fine tuning of the Localized Surface Plasmon Resonance (LSPR) over the whole visible spectrum. We then investigate the relationship between the spectral position of the LSPR and the SERS intensity. The enhancement factor turned out to depend not only on the spectral position of the LSPR, but also on the shape of the metallic nanoparticles on which the surface plasmon is localized. In the same time, we build up an Apertureless Scanning Near Field Optical Microscope (ASNPM) set-up. The microscope is based on an atomic force microscope and a confocal detection coupled to a spectrometer. The near field/far field discrimination is achieved through the use of a lock-in detection of a photon counting device. Using this set-up along with a white light continuum, generated by coupling a Photonic Crystal Fiber to a Ti:Sa laser, made it possible to investigate the near field optical response of metallic nanoparticle gratings at different excitation wavelengths. A photon counting scheme was then used to directly record near field “extinction” spectra
Touzalin, Thomas. "Tip-enhanced Raman spectroscopy on electrochemical systems". Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS364.
Texto completoThe in situ investigation of electrochemical interfaces structures at the nanoscale is a key element in the understanding of charge and electron transfer mechanisms e.g. in the fields of energy storage or electrocatalysis. This thesis introduces the implementation of tip-enhanced Raman spectroscopy (TERS) in liquid and in electrochemical conditions enabling the nanoscale analysis of electrified solid/liquid interfaces through the strong and local electric field enhancement at gold or silver scanning tunneling microscopy (STM) probes. The ability of TERS to image inhomogeneities in the coverage density of a self-assembled monolayer (SAM) through a layer of organic solvent on gold was demonstrated. A TERS-inspired analytical tool was also developed, based on a TERS tip used simultaneously as a single-hot spot surface-enhanced Raman spectroscopy (SERS) platform and as a microelectrode (EC tip SERS). The reduction of an electroactive SAM could then be monitored by electrochemical and in situ SERS measurements. In situ electrochemical STM-TERS was also evidenced through the imaging of local variations of the electric field enhancement on peculiar sites of a gold electrode with a lateral resolution lower than 8 nm. Finally TERS also demonstrated to be efficient in investigating the structure of organic layers grafted either by electrochemical reduction or spontaneously. This work is therefore a major advance for the analysis of functionalized surfaces
Reymond-Laruinaz, Sébastien. "Biomolécules et systèmes nanostructurés : caractérisation par spectrométrie Raman exaltée de surface (SERS)". Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS023/document.
Texto completoThis work addressed the study of several kinds of nanostructured systems, biomolecules and inorganic thin films, mainly by Surface Enhanced Raman Spectroscopy (SERS). The aim was to investigate the structure and the chemical bonds. Transmission electron microscopy (TEM) was also used to complete the structural characterization of the different samples.Firstly, the study was conducted on molecules of biological interest. The aim was to study the interaction between silver nanoparticles and proteins. With this aim, silver nanoparticles bioconjugated with different proteins (hemoglobin, cytochrome C, BSA and lysozim) were synthesized. SERS results allowed concluding that proteins are chemisorbed on the silver nanoparticules surface. SERS was also used in the low frequency range to characterize the structure of thin deposits of caffeine, a molecule of pharmaceutical interest.Raman spectroscopy and SERS were also used to study nanostructured TiO2:Au thin films. The first stages of the growth of gold nanoparticles in Au doped TiO2 thin films under annealing treatments were studied by low frequency Raman spectroscopy and TEM. Finally, it was shown that SERS effect can be used for the characterization of ultra-thin TiO2 films. With this aim, ultra-thin TiO2 films were deposited by Atomic Layer Deposition on Si substrates functionalized with gold nanoparticles and studied by SERS
Grimault, Anne-Sophie. "Modélisation du champ proche de structures résonantes 3D : application à la diffusion Raman exaltée de surface". Troyes, 2006. http://www.theses.fr/2006TROY0006.
Texto completoWe studied the position of the localized surface plasmon resonance and the surface enhanced Raman scattering of periodic arrays of metallic nanostructures with different size, form and environment. To calculate localized surface plasmon resonance and the Raman gain, we developed a numerical code based on the finite difference time domain method using the Drude-Lorentz dispersion model. Our results highlighted a strong influence of the geometry and environment of the nanoparticles on their resonance plasmon and their Raman signal. We observed dipolar and multipolar plasmon mode resonances as well as a shift between the position of the Plasmon resonance and the position of the maximum of the intensity of the Raman signal, whatever the size and the form of the nanoparticles. This numerical tool can thus make it possible to optimize manufacture of samples, by giving the parameters of size, form and environment necessary to achieve the most intense Raman signals
Libros sobre el tema "Spectroscopie Raman exaltée en surface"
Etchegoin, Pablo G. (Pablo Gabriel), ed. Principles of surface-enhanced Raman spectroscopy: And related plasmonic effects. Amsterdam: Elsevier, 2009.
Buscar texto completoHajbi, Abdeslam El. Contribution à l'étude de l'interface électrode/électrolyte par spectroscopie raman de surface. Grenoble: A.N.R.T, Université Pierre Mendes France (Grenoble II), 1986.
Buscar texto completoCapítulos de libros sobre el tema "Spectroscopie Raman exaltée en surface"
BARDEAU, Jean-francois, Bernard HUMBERT, Angélina D'ORLANDO y Guy LOUARN. "Spectroscopie vibrationnelle exaltée : Raman résonnant et SERS". En Spectroscopies vibrationnelles, 221–46. Editions des archives contemporaines, 2020. http://dx.doi.org/10.17184/eac.4202.
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