Дисертації з теми "(surface raman scattering) SERS"
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Harper, Mhairi. "DNA diagnostic assays using Surface Enhanced Raman Scattering (SERS)." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=22401.
Повний текст джерелаTsoutsi, Dionysia. "Inorganic Ions Sensing by surface-enhanced Raman scattering spectroscopy." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/288213.
Повний текст джерелаEn este proyecto de tesis se ha conseguido desarrollar un sistema de detección, identificación y cuantificación independiente de iones inorgánicos. La detección de los iones se basa en su diferente afinidad hacia diferentes ligandos orgánicos a través de la espectroscopia de dispersión Raman aumentada por superficies (surface-enhanced Raman scattering, SERS). En resumen, como sustrato se utilizarán nanopartículas de plata o microesferas nanoestructuradas que se prepararán mediante la adsorción de nanopartículas de oro sobre la superficie de microesferas de sílice mediante el protocolo de capa por capa y su posterior crecimiento epitaxial con plata. Este último paso se realizará mediante protocolos desarrollados en nuestro laboratorio y tiene como objetivo la obtención de superficies plasmónicas discretas altamente eficientes en SERS. Los sustratos se funcionalizarán posteriormente con ligandos orgánicos tiolados con alta afinidad por iones inorgánicos (el fluoróforo orgánico, amino-MQAE y la terpiridina, pztpy-DTC). Como paso siguiente, se realizará la detección y cuantificación simultánea de los iones combinando para su detección espectroscopia SERS. Los cambios espectrales SERS en el modo de vibración de los ligandos orgánicos están correlacionados como función de la concentración de cada ion con límites de detección comparables a los de varios métodos analíticos convencionales.
In this research project we successfully developed a novel sensing system for the identification and quantification of inorganic ions independently by means of surface-enhanced Raman scattering (SERS) spectroscopy. The detection of the ions is based on their different affinity toward various organic ligands. In summary, we use as SERS-active substrates, either silver nanoparticles or composite nanostructured particles prepared by adsorption of gold nanoparticles on the surface of silica microbeads, using layer-by-layer assembly protocol and the subsequent epitaxial overgrowth of silver. This last step is performed using protocols developed in our laboratory and aims to the fabrication of highly plasmonic surfaces for SERS experiments. Next, the substrates are functionalized with thiolated organic ligands with high affinity toward inorganic ions (amino-MQAE, an organic fluorophore, and pztpy-DTC, a terpyridine). As a further step, the simultaneous identification and quantification of the ions, using SERS spectroscopy, is performed. Vibrational changes in the SERS spectra of the organic ligands are correlated as a function of the concentration of each ion with limits of detection comparable to those of several conventional analytical methods.
Yan, Bo. "Rationally designed substrates for SERS biosensing." Thesis, Boston University, 2013. https://hdl.handle.net/2144/12894.
Повний текст джерелаThe large electromagnetic field enhancement provided by nanostructured noble metal surfaces forms the foundation for a series of enabling optical analytical techniques, such as surface enhanced Raman spectroscopy (SERS), surface enhanced IR absorption spectroscopy (SEIRA), surface enhanced fluorescent microscopy (SEF), to name only a few. Critical sensing applications have, however, other substrate requirements than mere peak signal enhancement. The substrate needs to be reliable, provide reproducible signal enhancements, and be amenable to a combination with microfluidic chips or other integrated sensor platforms. These needs motivate the development of engineerable SERS substrate "chips" with defined near- and far-field responses. In this dissertation, two types of rationally designed SERS substrates - nanoparticle cluster arrays (NCAs) and SERS stamp - will be introduced and characterized. NCAs were fabricated through a newly developed template guided self-assembly fabrication approach, in which chemically synthesized nanoparticles are integrated into predefined patterns using a hybrid top-down/bottom-up approach. Since this method relies on chemically defined building blocks, it can overcome the resolution limit of conventional lithographical methods and facilitates higher structural complexity. NCAs sustain near-field interactions within individual clusters as well as between entire neighboring clusters and create a multi-scale cascaded E-field enhancement throughout the entire array. SERS stamps were generated using an oblique angle metal deposition on a lithographically defined piston. When mounted on a nanopositioning stage, the SERS stamps were enabled to contact biological surfaces with pristine nanostructured metal surfaces for a label-free spectroscopic characterization. The developed engineered substrates were applied and tested in critical sensing applications, including the ultratrace detection of explosive vapors, the rapid discrimination of bacterial pathogens, and the label-free monitoring of the enzymatic degradation of pericellular matrices of cancer cells.
Shi, Chao. "Molecular fiber sensor probes based on surface enhanced Raman scattering (SERS) /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2009. http://uclibs.org/PID/11984.
Повний текст джерелаKarabicak, Seher. "Application Of Surface-enhanced Raman Scattering (sers) Method For Genetic Analyses." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613130/index.pdf.
Повний текст джерелаtranscription in patients as an alternative to available enzyme activity measurement methods. First, SERGen probes were prepared using SERS active labels and specific proteasome gene sequences. Then DNA targets to complementary SERGen probe sequences were hybridized and SERS active label peak was followed.
Faulds, Karen Jade. "Detection of drugs of abuse by surface enhanced Raman scattering (SERS)." Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288636.
Повний текст джерелаBoddu, Naresh Kumar. "Trace analysis of biological compounds by surface enhanced Raman scattering (SERS) spectroscopy /." Connect to resource online, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1229542206.
Повний текст джерелаStewart, Shona Diane. "Surface enhanced Raman scattering on electrochemically prepared silver surfaces." Thesis, Queensland University of Technology, 1999.
Знайти повний текст джерелаAndrade, Gustavo Fernandes Souza. "Caracterização espectroscópica da tiossemicarbazona do formilferroceno (TFF) através das técnicas SERS (Surface-Enhanced Raman Scattering) e Raman ressonante." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-13092006-164920/.
Повний текст джерелаIn this dissertation, the adsorption process of the formylpyridine thiosemicarbazone (TFF) at silver and gold surfaces in aqueous and in acetonitrile solutions has been characterized by using the SERS (Surface-enhanced Raman Scattering) technique. It has been verified that TFF adsorbs through N1 and S atoms on the metallic surfaces. The faradaic processes of TFF have been monitored through the SERS and UV-visible absorption spectroscopies. The SERS spectra at -1,4 V (Ag/AgCl) suggest aminomethylferrocene as one of the reduction products of TFF. By using the UV-visible absorption technique, it has been verified, at this potential, a new band at 240 nm in the spectrum, which indicates the presence of thiourea. The observation of these two reduction products has confirmed that the general reduction mechanism for thiosemicarbazonas works for TFF. Neither SERS nor UV-vis spectral changes have been observed during the redox process of FeII/FeIII (E1/2= 0,55 V). The adsorption and faradaic processes of thisemicarbazide (TSC) at silver electrode have also been studied by SERS technique. It has been verified that, in acidic and neutral media, the TSC is adsorbed through a cis-configuration at a potential close to 0,0 V, showing an interaction of the S atom through bond formation with the surface and through the H atoms bonded to N1 via ion pair formation with the adsorbed Cl- anions. At more negative potentials, the chloride anions leave the electrode surface and the TSC changes to trans-configuration. No faradaic process has been observed as reported in the literature. This result has been confirmed by using the capillary electrophoresis technique. The resonance Raman effect of the TFF has been studied, and the excitation profiles of the bands have been shown as minimum, which indicates an electronic interaction between the two cromophores of the TFF (thiosemicarbazone and ferrocenyl). The theoretic excitation profiles have been calculated by using the transform method, and the results of the obtained adjustment has indicated that there has been a distortion of the ferrocenyl vibrational modes for an electronic transition at 312 nm, assigned to the n-p* of thiosemicarbazone moiety. This result has indicated a great interaction between the two cromophores of TFF. In order to compare the resonance Raman behavior of the TFF with that of the ferrocene, the resonance Raman spectra of the ferrocene have been obtained. It has been verified that the two compounds present an anti-resonant Raman effect, even though the bands have presented very different excitation profiles from those observed in the TFF, which indicates that the incorporation of the thiosemicarbazone group into the ciclopentadienyl has changed the electronic structure of the ferrocenyl group.
Boddu, Naresh K. "Trace Analysis of Biological Compounds by Surface Enhanced Raman Scattering (SERS) Spectroscopy." Youngstown State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1229542206.
Повний текст джерелаGühlke, Marina. "Oberflächenverstärkte Hyper-Raman-Streuung (SEHRS) und oberflächenverstärkte Raman-Streuung (SERS) für analytische Anwendungen." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17570.
Повний текст джерелаHyper-Raman scattering follows different symmetry selection rules than Raman scattering and, as a non-linear two-photon process, profits even more than Raman scattering from enhanced electromagnetic fields at the surface of plasmonic nanostructures. Surface-enhanced hyper-Raman scattering (SEHRS) could thus gain practical importance for spectroscopy. The combination of SEHRS and surface-enhanced Raman scattering (SERS) offers complementary structural information. Specifically, due to the localization of the enhancement to the close proximity of the nanostructures, this information can be utilized for the characterization of the interaction between molecules and metal surfaces. The aim of this work was to increase the understanding of the SEHRS effect and to assess its applicability to answer analytical questions. For that purpose, SEHRS experiments with excitation at 1064 nm and SERS experiments with excitation at the same wavelength, as well as with excitation at 532 nm - to detect SEHRS and SERS in the same spectral region - were conducted. As an example for non-resonant excitation, pH-dependent SEHRS and SERS spectra of para-mercaptobenzoic acid were examined. Based on these spectra, the interaction of different silver nanostructures with the molecules was characterized. beta-Carotene was used to study the influence of resonance enhancement by the excitation of a molecular electronic transition during SEHRS experiments. By the thiol-functionalization of carotene, a more intense interaction with the silver surface was achieved, which enables to obtain not only resonant SEHRS and SERS but also non-resonant SERS spectra of carotene. Hyperspectral SEHRS imaging in combination with microspectroscopy was demonstrated by analyzing the distribution of different dyes on structured plasmonic surfaces.
Mabbott, Samuel. "Optimisation of solid-state and solution-based SERS systems for use in the detection of analytes of chemical and biological significance." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/optimisation-of-solidstate-and-solutionbased-sers-systems-for-use-in-the-detection-of-analytes-of-chemical-and-biological-significance(de70094c-8da0-4326-bfb2-6adf00b86af9).html.
Повний текст джерелаMarotta, Nicole Ella. "Patterned nanoarray sers substrates for pathogen detection." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37274.
Повний текст джерелаGisbert, Quilis Patricia. "Optical detection and structural analysis of DNA via direct surface-enhanced Raman scattering." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/586257.
Повний текст джерелаUn nuevo método basado en la espectroscopía Raman intensificada por superficie (SERS) se implementa en esta tesis para la detección óptica y análisis estructural de ácidos nucleicos. Este método se basa en la utilización de partículas de plata cargadas positivamente, como sustratos plasmónicos para el análisis de ADN en solución por SERS. Esta estrategia se ha aplicado con éxito para la detección ultrasensible de mutaciones puntuales en el gen K-Ras, las cuales son comúnmente analizadas con objetivos diagnósticos, especialmente en el cáncer colorectal. En paralelo con este estudio, el impacto estructural de estas partículas con el ADN se analiza con profundidad.
A novel approach based on surface-enhanced Raman scattering (SERS) for the label-free optical detection and structural analysis of nucleic acids is implemented in this dissertation. The method relies on the use of positively-charged silver nanoparticles as plasmonic substrates for SERS analysis of DNA in solution. This strategy is successfully applied for the sensitive detection of clinically relevant point mutations in the K-Ras gene, which are routinely screened for diagnostic purposes, especially in colorectal cancer. Along this study, the impact of the cationic nanoparticles on the structural features of the interacting DNA molecules is extensively investigated.
Morlà, Folch Judit. "Direct Label-free Surface-Enhanced Raman Scattering Analysis of Nucleic Acids." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/454761.
Повний текст джерелаLa investigación se ha realizado en el contexto de la espectroscopia “Surface-Enhanced Raman Scattering” (SERS) para el análisis de ácidos nucleicos. SERS es una técnica analítica de gran alcance que combina la especificidad estructural y alta flexibilidad experimental de la espectroscopia Raman con la extremada sensibilidad proporcionada por la amplificación de la señal óptica por parte de la nanoestructura metálica. La caracterización de los ácidos nucleicos (ANs) se ha convertido en una meta importante en muchos campos. En general, los ANs se encuentran en bajas cantidades de modo que la sensibilidad representa un requisito clave para su detección. En este sentido, la espectroscopia SERS se puede considerar una poderosa herramienta para el análisis de ANs, dado a su extraordinaria sensibilidad y la rica información estructural proporcionada. Hasta ahora, el análisis SERS de ANs ha sido en gran parte restringido a enfoques indirectos, perdiendo las informaciones estructurales de la adquisición directa de la huella vibracional. En este sentido, nanopartículas de plata cargadas positivamente recubiertas con espermina, fueron diseñadas específicamente para el análisis de ANs con SERS directo. Mediante el uso de este sustrato se asegura la interacción electrostática entre los ANs y los coloides produciendo espectros SERS intensos y altamente reproducibles a nivel ultrasensible. Este método directo, sin necesidad de añadir marcadores y altamente sensible se implementó con éxito en diversas aplicaciones de interés biológico, incluyendo la identificación y cuantificación de nucleobases modificadas, en simple y doble cadena de ADN, cuantificación de la composición de nucleobases en ADN cortos y en el ADN genómico, y clasificación vibracional de ARNs pequeños estructuralmente similares. En resumen, esta tesis demuestra el gran potencial analítico de este nuevo método directo, abriendo nuevas vías para el futuro desarrollo de una técnica analítica rápida, de bajo coste y alto rendimiento para análisis de ácidos nucleicos.
The research has been carried out in the context of Surface-Enhanced Raman Scattering (SERS) spectroscopy for nucleic acids analysis. SERS is a powerful analytical technique that combines the structural specificity and high experimental flexibility of Raman spectroscopy with the extremely high sensitivity provided by the metal nanostructure amplification of the optical signal. Characterization of nucleic acids (NAs) has become a major goal in fields such as genetics or drug discovery. NAs are usually found in low amounts which require extremely sensitive techniques to be detected. Sensitivity represents a key requirement for their implementation into easy-to-use, cost-effective, rapid and high accuracy NA sensors. In this regard, the extraordinary sensitivity, in combination with the rich structural information provided by the Raman spectra, turned SERS into a powerful tool for the analysis of NAs. SERS analysis of NAs has been largely restricted to indirect approaches, dismissing the exquisite structural information provided by the direct acquisition of the biomolecular vibrational fingerprint. In this regard, positively charged silver nanoparticles coated with spermine were specifically designed for direct label-free SERS analysis of nucleic acids. By using these cationic nanoparticles the electrostatic interaction between NAs and the colloids is ensured yielding intense and highly reproducible SERS spectra at the ultrasensitive level. This highly sensitive label-free approach was successfully implemented in various applications of biological interest including identification and quantification of chemically-modified nucleobases in single and double stranded DNA, quantification of nucleobase composition in short and genomic DNA, and vibrational classification of structurally similar small RNA. In summary, this thesis demonstrates the tremendous analytical potential of this novel direct SERS method for nucleic acids analysis, opening new ways for the future development of a fast, low-cost, and high-throughput analytical technique for nucleic acids analysis.
Brolo, Alexandre Guimar aes. "Surface-enhanced Raman scattering, SERS, studies of pyrazine adsorbed on polycrystalline and single crystal electrodes." Phd thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://hdl.handle.net/10012/221.
Повний текст джерелаBrolo, Alexandre Guimaraes. "Surface-enhanced Raman scattering, SERS, studies of pyrazine adsorbed on polycrystalline and single crystal electrodes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30589.pdf.
Повний текст джерелаDogan, Uzeyir. "Preparation And Characterization Of Surface Enhanced Raman Scattering Substrate Through Electro Deposition Of Silver-pedot Film On Ito Glass Surface." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613667/index.pdf.
Повний текст джерелаmoreover, even single molecule detection can be possible. In this study, a novel surface enhanced Raman scattering (SERS) substrate was prepared in two steps: In the first step, ethylenedioxythiophene (EDOT) monomer was polymerized electrochemically onto indium tin oxide (ITO) coated glass. In the next step, silver ions were reduced electrochemically onto surface prepared in the previous step.In the substrate preparation part, the reduction potential of silver ion, the concentration of silver ions in solution, the polymer film thickness and reduced silver amount on substrates were optimized to get the best SERS performances from substrates. The prepared substrates were characterized by cyclic voltammetry (CV), ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) attached to SEM. In the SERS performance investigation part, homogeneity and the shelf life of the prepared silver-PEDOT substrates were tested. Homogeneity is very important in terms for the applications of Raman technique in quantitative analysis since most of the reported substrates are lack homogeneity consideration, our study will be an important contribution to the literature. The stability of the substrate was investigated for a period of one month. The very small change in the signal at the end of one month indicated that the substrate can be used even longer time with high efficiency. In all the studies, brilliant cresyl blue (BCB) is used as a model compound. Some important Raman active chemicals, namely, rhodamine 6G (R6G) and 4-mercapto benzoic acid (4-MBA) were detected by using the prepared substrates.
Santos, Júnior Vianney Oliveira dos. "Estudos SERS (Surface-Enhanced Raman Scattering) em meio de Líquido Iônico BMIPF6 usando eletrodo de prata." reponame:Repositório Institucional da UnB, 2007. http://repositorio.unb.br/handle/10482/2860.
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Líquidos iônicos a temperatura ambiente (LI) tem tido aplicação cada vez maior em várias áreas da Química, devido às diferentes propriedades que o mesmo oferece em relação aos solventes convencionais. LI's derivados do cátion BMI+ se destacam devido as suas propriedades físico-químicas singulares, como alta condutividade elétrica e uma larga janela eletroquímica. Em contraste com outras técnicas espectroscópicas, O efeito SERS é uma técnica extremamente poderosa para estudos de interfaces eletrodo/solução em sistemas eletroquímicos, devido a sua alta sensibilidade e à possibilidade de trabalhar com interfaces sólido-líquido e em meio aquoso. Nesse trabalho foram obtidos os espectros SER in situ do BMIPF6 adsorvido em eletrodo de Ag para vários potenciais aplicados, bem como da piridina adsorvida na interface Ag/BMIPF6. Obteve-se também os espectros SER da solução aquosa de BMICl em vários pH's, sendo proposta uma atribuição vibracional completa para o mesmo. Os resultados obtidos na adsorção da piridina mostram que a interface Ag/BMIPF6 pode ser usada com sucesso para o estudo SERS de sistemas eletroquímicos, tendo se caracterizado o comportamento da piridina no meio com a variação do potencial aplicado. Observou-se nos espectros SER do BMIPF6 adsorvido sobre eletrodo de Ag a geração eletroquímica de um derivado carbeno e a variação da geometria de adsorção em potenciais característicos. Os experimentos SERS do BMICl em meio aquoso mostraram que seu comportamento depende do pH do meio, com a geração eletroquímica de um derivado radical neutro em pH básico. Os resultados obtidos mostram que o efeito SERS é uma ferramenta poderosa para o estudo de sistemas eletroquímicos em líquidos iônicos, permitindo a obtenção de uma série de informações sobre processos eletroquímicos na superfície do eletrodo, como mudanças de geometria de adsorção e formação de pares iônicos, além de informações estruturais sobre as espécies adsorvidas. _______________________________________________________________________________________ ABSTRACT
Room Temperature Ionic Liquids (RTIL) has had increasingly application in different areas of the Chemistry, due to its advantageous physical-chemical properties in relation to other conventional solvents. BMI cation derived RTILs got relevance due its singular physical-chemical properties, like a good electric conductivity and a wide electrochemical window. In contrast with others spectroscopic techniques, SERS is a extremely powerful technique for studies of electrode/solution interface in electrochemical systems, because of its high sensitivity and the possibility of working with solid-liquid interfaces and in aqueous media. In this work SER spectra were obtained in situ for adsorbed BMIPF6 on Ag electrode for several applied potentials, as well the ones of adsorbed pyridine on the Ag/BMIPF interface. We also show the SER spectra of BMICl 6 aqueous solution at several pHs, being proposed its complete vibrational assignment. The results about the adsorption of pyridine show Ag/BMIPF 6 interface can be successfully used for SERS studies of electrochemical systems. This results have also characterized the electrochemical behavior of pyridine at different applied potentials. It was observed in the SER spectra of BMIPF6 adsorbed on Ag electrode the electrochemical generation of a BMI carbene and changes of the adsorption geometry at characteristic potentials. The SERS study of BMICl in aqueous media has shown that its behavior depends on the pH of media, with the electrochemical generation of one neutral radical derived in alkaline media. The results show that the SERS effect is a powerful technique for the study of electrochemical systems in RTIL, allowing the attainment of a very kind of information about electrochemical processes occurring at electrode surface, like changes of adsorption geometry and ionic pairs formation, besides structural information about the adsorbed molecules.
Watling, Kym Marjorie, and n/a. "Spectroelectrochemical Studies of Surface Species in the Gold/Thiosulfate System." Griffith University. School of Biomolecular and Physical Sciences, 2007. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20081024.164504.
Повний текст джерелаOliveira, Karolyne Vilela de. "Desenvolvimento de substrato para uso com efeito Raman intensificado por superfície (SERS – Surface-Enhanced Raman Scattering) e aplicações para compostos modelo." reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.12.D.20361.
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Neste trabalho foram preparados dois substratos com atividade SERS (surface-enhanced Raman scattering), baseados na dispersão de nanopartículas de prata em solução aquosa (AgNPs/Coloide) e em gel de agarose (AgNPs/Agar). Esses substratos foram caracterizados por MET e espectroscopia UV-vis. Ambos os substratos foram também investigados pelo efeito SERS, registrando-se 100 espectros em triplicata empregando o modo de mapeamento Raman numa região de 20x20 µm. Os diâmetros médios das AgNPs nas amostras de AgNPs/Coloide e AgNPs/Agar foram de 8 nm e 19 nm, respectivamente. Os espectros UV-vis desses materiais revelam que as AgNPs/Agar apresentam ressonâncias de plasmon de superfície na região de 600 nm. A adsorção da rodamina 6G (R6G) foi investigada para ambos os substratos, para concentrações entre 10-8 M e 10-5 M, por excitação SERS em 632,8 nm. As intensidades SERS da R6G nas AgNPs/Agar foram ca. 10 vezes mais fortes que aquelas apresentadas para a R6G adsorvida nas AgNPs/Coloide. As isotermas de adsorção obtidas para ambos os substratos foram bem ajustadas a isotermas de Langmuir com constantes de adsorção e energias livres de Gibbs de adsorção semelhantes, características de adsorção química. As AgNPs/Agar também foram investigadas como um substrato SERS-ativo para a adsorção de azul de metileno (MB), cristal violeta (CV) e benzotriazolato (BTA). Os resultados SERRS para o MB mostraram sinais de monômeros e dímeros de MB. Os resultados também mostraram que R6G e CV adsorvem na superfície das AgNPs/Agar formando pares iônicos com os íons cloreto adsorvidos usados para promover agregação, enquanto que o MB e BTA adsorvem quimicamente na superfície das AgNPs formando ligações Ag-N. Curvas de intensidade SERS vs. concentração do adsorbato em solução foram usadas para obter isotermas de adsorção. Em todos os sistemas investigados os dados experimentais apresentaram razoável ajuste para isotermas de Langmuir com constante de adsorção e energia livre de Gibbs de adsorção compatível com adsorção química (< -30 kJ.mol-1). Os resultados (SERS/SERRS) para R6G, MB e CV, em concentração de 10-8 M, adsorvidos em AgNPs/Agar mostraram que os sinais SERS/SERRS de moléculas únicas desses adsorbatos foram observados, mostrando que o material AgNPs/Agar obtido é um substrato adequado para a investigação SERS de adsorbatos em concentrações muito baixas.
Two different SERS (surface-enhanced Raman scattering) substrates have been prepared based on silver nanoparticles (AgNPs) dispersed in water solution (AgNPs/Colloid) and in agarose gel (AgNPs/Agar). The materials were characterized by TEM and UV-vis spectroscopy. Both substrates were also investigated by SERS by recording 100 spectra in triplicates, using the Raman mapping procedure in an area of 20x20 µm. The mean diameters of the AgNPs in these substrates were 8 nm and 19 nm, respectively. The UV-vis spectra of these materials show that the AgNPs/Agar present AgNPs aggregates with surface plasmon resonances in the region of 600 nm. The adsorption of Rhodamine 6G (R6G) at concentrations ranging from 10-8 M to 10-5 M on both substrates was investigated by SERS excitation at 632.8 nm. The SERS intensities of R6G on the AgNPs/Agar were ca. 10 times stronger than those displayed for R6G adsorbed on the AgNPs/Colloid. Adsorption isotherms obtained for both substrates were well fitted to Langmuir isotherms with similar adsorption constants and free Gibbs adsorption energy, characteristic of chemical adsorption. The AgNPs/Agar was further investigated as a SERS-active substrate for the adsorption of Methylene Blue (MB), Crystal Violet (CV) and benzotriazolate (BTA). The SERRS results for MB have shown signals from MB monomers and dimers. The results have also shown that R6G and CV adsorb on the AgNPs/Agar surface forming ion-pairs with the adsorbed chloride ions used to promote the AgNPs aggregation, while MB and BTA adsorb chemically on the AgNPs surface forming Ag-N bonds. Curves of SERS intensity vsadsorbate concentration in solution were used to obtain adsorption isotherms. In all investigated systems the experimental data presented reasonable fitting to Langmuir isotherm with adsorption constants and free Gibbs adsorption energy compatible with chemical adsorption (< -30 kJ.mol-1). The results (SERS/SERRS) for R6G, MB and CV at 10-8 M concentration adsorbed on AgNPs/Agar have shown that SERS/SERRS signals from single molecules of these adsorbates were observed, showing that the AgNPs/Agar material obtained is a suitable substrate for SERS investigation of adsorbates at very low concentrations.
Koksel, Bahar. "The Use Of N-polyethereal Polypyrroles In Preconcentration And Surface Enhanced Raman Scattering Studies." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610495/index.pdf.
Повний текст джерелаKumarswami, Neelam. "Development of a multiplexing biosensor platform using SERS particle immunoassay technology." Thesis, University of Bedfordshire, 2014. http://hdl.handle.net/10547/321094.
Повний текст джерелаOo, Swe Zin. "Design, fabrication and optimization of large area chemical sensor based on Surface-Enhanced Raman Scattering (SERS) mechanism." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/383010/.
Повний текст джерелаKwon, Yong-Hyok [Verfasser], and Heinz-Detlef [Akademischer Betreuer] Kronfeldt. "Surface-Enhanced Raman Scattering (SERS) Surfaces for in-situ trace analysis of PAHs in water by Shifted Excitation Raman Difference Spectroscopy (SERDS) / Yong-Hyok Kwon. Betreuer: Heinz-Detlef Kronfeldt." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1021976393/34.
Повний текст джерелаPetroni, Cintia Regina. "Síntese e funcionalização de nanopartículas de ouro utilizando um modelo de substância húmica comercial." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-05082013-154550/.
Повний текст джерелаOrganic dyes are an important class on environmental pollutants, and the nature of the interaction of such species with humic acid strongly determines their environmental behavior and fate. This work investigates different approaches for the synthesis of humic acid-gold nanoparticles (HA-AuNP), the performance of these particles as sensors for trace determination of organic dyes and the nature of their chemical interaction with humic acids by surface-enhanced Raman scattering (SERS). The Au nanoparticles were obtained by direct fabrication in aqueous media.The synthesis were carried out in the presence of humic acid at various pH values, and in the presence and absence of sodium citrate. In this approach, humic acid serves different purposes. In the synthesis of the nanoparticles, they serve as reducing agent and for surface stabilization, preventing coalescence of the nanoparticles in aqueous media. Considering the use of the nanoparticles as SERSactive substrates, the humic acid serves as an extraction phase associated with the SERS platform, favoring the interaction of the organic dyes with the metallic nanoparticles. This approach can be used to enhance the sensitivity and selectivity of SERS technique and avoid interference from other species in solution. It is also important to mention that the humic acid gives rise to a very weak Raman spectrum, and therefore does not interfere significantly in the spectroscopic detection of the species of interest. The obtained HA-AuNPs were characterized by electronic spectroscopy, scanning electron microscopy and SERS, in order to establish a correlation between their morphology, surface plasmon, and their potential use as SERS platforms. The HA-AuNPs have been applied as SERS substrates for anionic and cationic textile dyes. The recorded Raman spectra are, in these cases, assigned to the complex formed by the humic acid and each of the species of interest. The obtained results revealed a significant dependence on the morphological and electronic properties of the HA-AuNPs with the synthesis procedure, and also a strong interaction between the nanoparticles and cationic dies. We conclude that HA-AuNP may provide a valuable approach for the spectroscopic characterization of environmentally relevant species and their chemical interaction with humic acids, through the use of surface enhanced Raman spectroscopy
Hugall, James T. "On the nature of SERS from plasmonic nanostructures." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/267496.
Повний текст джерелаSanci, Rukiye. "Synthesis Of Colloidal Silver Particles With Different Sizes By Seeding Approach For Surface Enhanced Raman Scattering (sers) Studies." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611076/index.pdf.
Повний текст джерелаVabbilisetty, Pratima. "Fabrication and Characterization of Substrate Materials for Trace Analytical Measurements by Surface Enhanced Raman Scattering (SERS) Spectroscopy Technique." Connect to resource online, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1231794465.
Повний текст джерелаIsraelsen, Nathan. "Surface-Enhanced Raman Spectroscopy-Based Biomarker Detection for B-Cell Malignancies." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4605.
Повний текст джерелаKeser, Sezen Lutfiye. "Preparation Of Gold Decorated Cobalt-silica Core-shell Nanoparticles For Surface Enhanced Raman Scattering Applications." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612383/index.pdf.
Повний текст джерелаii) deposition of a silica shell around the Co core and introduction of amine functional groups on the surface
iii) decoration of the surface with gold nanoparticles. Co nanoparticles were prepared in an inert atmosphere in the presence of capping and reducing agents. Size of the cobalt nanoparticles was varied by changing the concentration of the capping agent. Since cobalt particles are easily oxidized, they were coated with silica shell both to prevent oxidation and allow further functionalization. Silica coating of the particles were performed in water/ethanolic solution of tetraethyl orthosilicate (TEOS). Thickness of silica coating was controlled by varying the concentrations of TEOS. Besides, by adding 3-aminopropyl-triethoxysilane (APTS) to the reaction medium, primarily amine groups were introduced on the silica surface. For further modifications citrate stabilized gold nanoparticles were appended onto the surface of amine modified core-shell cobalt-silica nanoparticles. Gold decorated magnetic core-shell structures were used as SERS substrate with Raman dyes
brilliant cresyl blue (BCB) and rhodamine 6G (R6G). They were also utilized for preconcentration and SERS detection of 4-mercapto benzoic acid (4-MBA). Gold nanoparticles on the silica and thiol group on the 4-MBA were very selective to each other, thus, 4-MBA could be attached on to gold surface and it could be easily separated magnetically from the reaction medium and identified by Raman spectroscopy. Characterization of the cobalt, cobalt-silica and gold modified cobalt-silica nanoparticles was done by Field Emission Scanning Electron Microscopy (FE-SEM), Scanning-Transmission Electron Microscopy (S-TEM), Energy-Dispersive X-ray Spectroscopy (EDX), UV-Vis spectrometry, and Raman microscope system.
McNay, Graeme. "Advancing surface enhanced resonance Raman scattering (SERRS) techniques for biological detection." Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438129.
Повний текст джерелаMcCarney, Karen Michelle. "A flow cell surface enhanced resonance Raman scattering (SERRS) detection system." Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426325.
Повний текст джерелаNguyen, Thi Bich Ha. "Surface enhanced raman scattering (SERS) for in situ analysis of mixture of polycyclic aromatic hydrocarbons (PAHs) in sea water." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970620012.
Повний текст джерелаMallinder, Benjamin. "Detection of deoxyribonucleic acid by surface enhanced resonance Raman scattering spectroscopy (SERRS)." Thesis, University of Strathclyde, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248771.
Повний текст джерелаCoria, Garcia Jose Conrado. "SURFACE ENHANCED RAMAN SCATTERING OF INTERFACIAL HALIDE IONS AND WATER AT SILVER ELECTRODES IN THE PRESENCE OF LEAD (SERS, ADSORPTION, DEPOSITION)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275414.
Повний текст джерелаJohnston, Hannah Elizabeth. "Systems redox biology analysis of cancer." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31348.
Повний текст джерелаCruz, Sandra Maria Alves da. "Nanocomposites as probes for biodetection by SERS." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14134.
Повний текст джерелаThe present work aimed to explore the potential of new nanocomposites based on carbon nanostructures and metal nanoparticles for the detection of biomolecules through surface enhanced Raman scattering (SERS). In a first step, polyvinyl alcohol composites were prepared incorporating silver nanoparticles by two different reduction procedures. At first without introduction of carbon nanostructures. These composites showed good results for the SERS identification of nucleic acids. Next, the synthesis and characterization of graphene oxide was studied to be used in the preparation of silver and gold nanocomposites. The reduction of this nanomaterial with different chemical agents was explored, since its reduction degree may be a determinant factor for the application envisaged (biomolecules interaction). The preparation of the nanocomposites with silver and gold was performed with different reducing agents. The SERS activity of these new nanocomposites was then explored in the presence of different analytes, varying the experimental conditions for Raman spectra acquisition. It was interesting to verify that the silver containing nanocomposites presented the particularity to intensify the graphene D and G bands. It is also important to highlight that a new eco-friendly reducing agent was tested for the synthesis of the graphene oxide composites, an Eucalyptus Globulus extract. Other variable introduced was the preparation of gold nanostars synthesized with hydroxylamine in the presence of graphene oxide, which allowed the preparation of a new nanocomposite with SERS potential. Fibrous membranes were also prepared by electrospinning with the aim to prepare SERS supports with adequate topography and porosity for the formation of nanoparticles agglomerates for the creation of the so-called hot-spots and also to allow the penetration of the analyte molecules. The polymers polyvinyl alcohol and polyacrylonitrile were selected for electrospinning. Using this technique, electrospun mantles with silver and gold nanoparticles and nanocomposites were prepared. Several variables were studied, such as the introduction of the nano-fillers during the electrospinning process, later deposition of the nano-fillers on the simple electrospun polymeric fibres and surface functionalization of the simple polymeric membranes to link the nano-fillers. At last, the potentialities of using carbon nanotubes forests, produced by chemical vapor deposition and coated with gold film by sputtering, as new SERS substrates were explored. It was found that the SERS detection of DNA bases and ADN itself is possible using these substrates.
O presente trabalho pretendeu explorar as potencialidades de nanocompósitos, baseados em nanoestruturas de carbono e nanopartículas metálicas, para a deteção de biomoléculas através da técnica de difusão de Raman intensificada por superfície (SERS, surface-enhanced Raman scattering). Primeiramente foram preparados nanocompositos de álcool polivinílico com nanopartículas de prata sintetizadas através de dois métodos, ainda sem a presença de nanoestruturas de carbono. Verificou-se que estas membranas apresentaram bons resultados na identificação de ácidos nucleicos por SERS. A síntese e caracterização do óxido de grafeno que serviu de base para a preparação dos nanocompósitos de prata e ouro foi objecto de estudo. A sua redução química com diferentes agentes redutores foi explorada, uma vez que o grau de redução deste nanomaterial pode ser um fator determinante para a aplicação pretendida (interação com biomoléculas). A preparação de nanocompósitos de óxido de grafeno com prata e ouro foi realizada com diferentes agentes redutores. A atividade de SERS destes novos nanocompósitos foi então explorada na presença de vários analitos, em diferentes condições de aquisição dos espectros de Raman, bem como em diferentes tipos de suporte. Verificou-se que os nanocompósitos preparados com prata apresentaram a particularidade de permitirem a intensificação dos sinais de Raman das bandas D e G do grafeno. É de salientar a introdução de um novo agente redutor amigo do ambiente para síntese de compósitos de grafeno com nanopartículas metálicas: o extrato de eucalipto. Outra variável introduzida foi a preparação de nanopartículas de ouro em forma de nanoestrelas sintetizadas com hidroxilamina na presença de óxido de grafeno, tendo-se obtido assim um novo nanocompósito com potencialidades em SERS. Com o objectivo de preparar suportes para SERS com uma topografia e porosidade adequadas à criação de locais privilegiados para a agregação de nanopartículas metálicas e para a penetração das moléculas do analito foram produzidas mantas por electrofiação. Para tal, selecionaram-se os polímeros álcool polivinílico e poliacrilonitrilo. Com esta técnica preparam-se igualmente nanocompósitos de ouro ou prata e grafeno. Estudaram-se algumas variáveis de síntese, tais como a introdução de nanopartículas e nanocompósitos in situ, (isto é, durante o processo de electrofiação), deposição posterior das nanopartículas e dos nanocompósitos nas fibras poliméricas (preparadas previamente) e funcionalização superficial das mantas com o objectivo de ligar os nanomateriais a posteriori. Por fim, foi também explorada a potencialidade em SERS de novas estruturas compostas por florestas de nanotubos de carbono com cobertura de ouro produzidas por deposição química de vapor. Verificou-se que a detecção de bases de ADN e o próprio ADN é possível usando estes materiais.
Kaya, Murat. "Preparation And Surface Modification Of Noble Metal Nanoparticles With Tunable Optical Properties For Sers Applications." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613129/index.pdf.
Повний текст джерелаNardou, Éric. "Nanoparticules métalliques en matrices vitreuses pour l’amplification Raman." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10207/document.
Повний текст джерелаSignals in optical fibers used for the transfer of information are attenuated due to impurities, scattering, absorption… To compensate for these losses, several techniques were developed like Erbium Doped Fiber Amplifier (EDFA). An alternative to rare earth doped fiber amplifier is Raman Amplification, which results from stimulated Raman scattering. Noble metal nanoparticles have optical properties induced by the collective oscillation of their conduction electrons when they interact with an electromagnetic wave. These particles strongly absorb the electromagnetic field at a frequency called surface Plasmon resonance frequency. This work is mainly based on effects leading to the improvement of the Raman Amplification. The ANR project Fenoptic (2010-2012), gathering Draka and several French laboratories (ICB (Dijon), CMCP (Paris), LPCML (Lyon)) is interested in the integration of noble metal nanoparticles in optical fibers using properties of the surface Plasmon resonance to improve the efficiency of optical amplifiers. In this work, different kinds of samples (suspensions, layers, optical fiber performs) with metal nanoparticles were studied. The experiments were based on the characterization (form and position of the Plasmon band) of noble metal nanoparticles in amorphous matrix and Raman spectroscopy was used to study the Surface Enhanced Raman Spectroscopy (SERS) effect. For the first time, we found the Raman signal exaltation of an amorphous matrix
Appelblad, André. "Development of a Temperature Controlled Cell for Surface Enhanced Raman Spectroscopy for in situ Detection of Gases." Thesis, Umeå universitet, Institutionen för fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-89799.
Повний текст джерелаDetta dokument beskriver ett examensarbete för civilingenjörsexamen i teknisk fysik vid Umeå Universitet som utförts under vårterminen 2014. I examensarbetet har en kyl-/värmecell för temperaturkontroll av substratytor för ytförstärkt ramanspektroskopi (SERS) för snabb detektion av farliga flyktiga ämnen konstruerats och testats. Arbetet utfördes vid Totalförsvarets forskningsinstitut (FOI) i Umeå, Sverige. Utgångspunkten var ett Linkam Scientific Instruments TS1500 mikroskopsteg, vilket utrustades med ett Peltierelement för kylning/värmning och en termistor för temperaturövervakning. Ett styrsystem baserat på ett Arduino Uno mikrostyrenhetskort konstruerades med ett motordrivkort (H-brygga) vilket använder pulsbreddsmodulering (PWM) för att reglera spänningen till Peltierelementet utifrån en PI-regulator. Den färdiga cellen klarade att reglera temperaturen på ett SERS-substrat i ett temperaturspann på ungefär -15 till +110 °C med en temperaturstabilitet på ±0.22 °C av måltemperaturen. Cellen testades sedan på flyktiga ämnen för att visa dess funktion. Difluorometyl-2,2,2-trifluoro-1-kloroetyleter (isofluran) i gasfas, med instrumentluft som bärargas, flödades genom cellen och SERS-spektra erhölls vid olika koncentrationer och temperaturer. Vid samtliga koncentrationer visades att lägre temperatur ger ökad signalstyrka. När ytan sedan värmdes upp sjönk signalen reversibelt tillbaka till ursprungsvärdet. Nyckelord: temperaturkontroll, ytförstärkt ramanspektroskopi, SERS, flyktiga ämnen, Peltierelement, thermistor, PWM, H-brygga, PI(D)-regulator.
McLaughlin, Clare. "Development and evaluation of Surface Enhanced Resonance Raman Scattering (SERRS) spectroscopy for quantitative analysis." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366867.
Повний текст джерелаDey, Priyanka. "Hybrid polymer/metal nanoparticles with surface enhanced raman tracking for potential use in nanomedicine." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/74991/1/Priyanka_Dey_Thesis.pdf.
Повний текст джерелаAndrade, Gustavo Fernandes Souza. "Adsorção molecular em metais de transição (ferro, cobalto e níquel) monitorada pela técnica de espalhamento Raman intensificado pela superfície: diferentes tipos de substratos metálicos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-24102007-134700/.
Повний текст джерелаSurface-enhanced Raman spectra of organic adsorbates on Fe, Co and Ni electrodes were acquired after the development of specific methodologies described in this PhD thesis. Electrochemical activation procedures were developed for the three bare metaIs electrodes. The electrochemical activation protocols were applied for the acquisition of SERS spectra of pyridine, 1,10-phenanthroline and 2- and 4-aminopyridine on Fe, Co e Ni electrodes. The total and relative intensities changes of SERS bands with the applied potentials were explained by the charge transfer mechanism, which had a large contribution in the SERS enhancement for these metaIs. The enhancement factor determined for the three metaIs, on the 102-103 times range, strongly depends on the adsorbate\' s vibrational modes. The SERS spectra of pyridine on the transition metals and vibrational spectra calculations of pyridine with metallic atoms showed that the formation of α-pyridil in the adsorption on transition metaIs, suggested in the literature, didn\'t occur. The calculated pyridine SERS excitation profiles present reasonable correlaton with the experimental data. The SERS results for 1,10-phenanthroline showed that the free molecule was the adsorbing species. The potential dependence of the SERS relative intensities was different from those of the resonance Raman spectra of 1,10-phenanthroline complexes with transition metal ions, indicating that different excited states were probed by the two techniques. 2-aminopyridine adsorbed through the pyridinic ring at less negative potentials and through both pyridinic and aminic nitrogens at more negative potentials on Co and Ni electrodes, but for Fe electrode it adsorbed exclusively through the pyridinic nitrogen. 4-aminopyridine adsorbed perpendicularly to the electrode. In 0,1 mol.L-1 KCl electrolytic solution, 4-aminopyridine changed from weak1y bound to a surface complex similar to the synthesized complex at more negative potentials. In 0,1 mol.L-1 KI electrolytic solution, both species were observed in a larger potential interval. On the Ni electrode, protonated 4aminopyridine was observed for V = -0.7 V, and for more negative potentials a surface complex, similar to the synthesized one, was observed. The electrodeposition of ultrathin film of Co and Ni on electrochemically-activated Ag electrodes allowed obtaining SERS spectra of pyridine with high enhancement factors. The SERS spectra of py for films thickness higher than 2 monolayers of Co or Ni presented intense bands of pyridine adsorbed on these metals, and no bands of pyridine adsorbed on Ag were observed, indicanting the absence of pinholes in the films. The relative intensities of SERS spectra on the thin films were similar to those obtained for the SERS of pyridine on the bare metaIs electrodes for films thicker than 7 monolayers, but with SERS intensity 100 times higher. The SERS activity and signal strength reproducibility of Au nanostructured substrates obtained by electrodeposition on a polystyrene masking were evaluated. The SERS spectra of 4-mercaptopyridine adsorbed on optimized electrodes presented intensities 2 times greater than those of the electrochemically activated Au electrode. The SERS intensity reproducibility for these substrates was ± 15%, indicating the potential use of such substrates as sensors.
Brown, Rachel. "The chemical modification of DNA for analysis by surface enhanced resonance Raman scattering (SERRS) spectroscopy." Thesis, University of Strathclyde, 2002. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21166.
Повний текст джерелаPrinz, Julia [Verfasser], Ilko [Akademischer Betreuer] Bald, Tim [Gutachter] Liedl, and Michael Uwe [Gutachter] Kumke. "DNA origami substrates as a versatile tool for surface-enhanced Raman scattering (SERS) / Julia Prinz ; Gutachter: Tim Liedl, Michael Uwe Kumke ; Betreuer: Ilko Bald." Potsdam : Universität Potsdam, 2017. http://d-nb.info/1218793171/34.
Повний текст джерелаDelhaye, Caroline. "Spectroscopie Raman et microfluidique : application à la diffusion Raman exaltée de surface." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13927/document.
Повний текст джерелаThis 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
Levene, Clare. "Advanced Raman, SERS, and ROA studies of biomedical and pharmaceutical compounds in solution." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/advanced-raman-sers-and-roa-studies-of-biomedical-and-pharmaceutical-compounds-in-solution(1c05f618-b1c2-4663-870a-3d51b32dad7b).html.
Повний текст джерелаHong, Koh Yiin. "Label-free plasmonic detection using nanogratings fabricated by laser interference lithography." Thesis, Plasmonics, 2017. http://hdl.handle.net/1828/7849.
Повний текст джерелаGraduate
2018-02-17
Campbell, Mairi. "Development of a surface enhanced resonance Raman scattering (SERRS) method for the determination of 2,4,6-trinitrotoluene." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366875.
Повний текст джерела