Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 228 for “"Surface-enhanced Raman"”.
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Tailored Materials for Surface-Enhanced Raman Spectroscopy
Surface-enhanced Raman spectroscopy (SERS) is a useful analytical tool that has grown in popularity since its discovery 40 years ago. Presently, a large number of materials are used as SERS substrates, including thiol-functionalised nanoparticles which form a large class of SERS-active materials as …
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High pressure surface enhanced Raman scattering spectroscopy
Surface-enhanced Raman scattering spectroscopy (SERS) was combined with the diamond anvil cell technique to study molecular monolayers and single molecules under high pressure. Vibrational spectra up to 8 GPa were obtained for self-assembled monolayers (SAMs) of the energetic material simulant …
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Surface-Enhanced Raman Spectroscopy Enabled Microbial Sensing
… result in high costs and long turnaround times. Surface-enhanced Raman spectroscopy (SERS)-based techniques have been proposed to overcome these limitations. In this dissertation, we discuss work conducted to develop novel SERS-based methods to enable both sensitive microbial quantification and …
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Plasmonic Au nanostructures for surface-enhanced raman spectroscopy
Raman spectroscopy is a spectroscopic technique that provides rich structural information for identifying chemical species but finds limited applications owing to its low sensitivity. Surface-enhanced Raman spectroscopy (SERS) is capable of solving the issue of sensitivity by enormously amplifying …
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Surface Enhanced Raman Scattering Studies in Ultrahigh Vacuum
We have observed Raman scattering signals from carbon monoxide adsorbed on silver films deposited on a 120 K substrate that are approximately 5 orders of magnitude stronger that would be expected from the known cross section. These studies were performed in an ultrahigh vacuum chamber. This …
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Bio-interfaced Nanolaminate Surface-enhanced Raman Spectroscopy Substrates
Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique that combines molecular specificity of vibrational fingerprints offered by Raman spectroscopy with single-molecule detection sensitivity from plasmonic hotspots of noble metal nanostructures. Label-free SERS has attracted …
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Application of Surface Enhanced Raman Spectroscopy to Biological Systems
In dieser Arbeit wurden die Resonanz-Raman-Spektroskopie (RR-Spektroskopie) sowie die oberflächenverstärkte Resonanz-Raman-Spektroskopie (SERR-Spektroskopie) verwendet, um biologische Systeme, insbesondere Hämproteine, zu untersuchen. Der elektronische Übergang der Hämgruppe kann ausgenutzt werden, …
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DNA diagnostic assays using Surface Enhanced Raman Scattering (SERS)
… oligonucleotides and silver nanoparticle surfaces, which generate strong surface enhanced Raman scattering (SERS) responses through specific hybridisation events which correlate to the presence of targeted sequences. During this study, the attraction of oligonucleotides onto metal …
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Characterisation of bacteria by surface enhanced Raman spectroscopy (SERS)
… molecular, and spectroscopic techniques. Surface-enhanced Raman spectroscopy (SERS) has received considerable attention as a potential method for the characterisation of bacteria.<br/><br/>The aims of this thesis were to (i) develop a SERS method that would characterise and distinguish …
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Surface Enhanced Raman Spectroscopy for Diagnostics in Ocular Health
This thesis focuses on the development of a Surface-Enhanced Raman Spectroscopy (SERS) assay for detecting biofilms in ocular health. Biofilms are complex communities of microorganisms encased in an extracellular polymeric substance (EPS) that present significant challenges for clinical diagnostics …
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Development of a Platform for Surface Enhanced Raman Scattering Endoscopy
… open approaches. Molecular imaging using surface enhanced Raman scattering (SERS) nanoparticles represents a platform which is well-suited for cancer detection in-vivo. It has already been established that SERS offers the ability to carry out multiplex assays far in excess of what is …
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Surface -enhanced Raman spectroscopic studies of organonitriles on copper colloids
Dramatic differences are observed between the surface-enhanced Raman spectra (SERS) of organonitriles mixed with copper colloids, the Raman of the free parent molecules, and the SERS for adsorption on a gold colloid. Specifically, nu(C≡N) is missing in the SER spectra involving the copper …
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Surface enhanced Raman scattering based assays for DNA detection by
Surface enhanced Raman scattering (SERS) based molecular diagnostic assays for the detection of specific DNA sequences have been developed in recent years to compete with the more common fluorescence based approaches. Current SERS assays require either time consuming separation steps that increase …
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Gold nanoshells for surface enhanced Raman spectroscopy and drug delivery
… of the ionic core, phenomena known as localized surface plasmons. The free electron oscillation creates surface plasmon multimodes of various orders. As a result, the average local near field surrounding the Au nanoshell is enhanced. The local field enhancement has been extensively used in …
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Unlocking single molecule detection sensitivities in surface-enhanced Raman spectroscopy
Single molecule detection sensitivities in surface-enhanced Raman spectroscopy require uniform fabrication of sub-5nm gaps between plasmonic nanoparticles over large areas. For this purpose, researchers have employed ultra-precise fabrication techniques like electron-beam lithography that offer …
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Surface-Enhanced Raman Spectroscopy for Environmental Analysis: Optimization and Quantitation
… sensitivity and fingerprint specificity, surface-enhanced Raman spectroscopy (SERS) has been widely employed for heavy metal, organic compound, and pathogen detection. However, SERS quantitation is challenging because 1) analytes do not stay in the strongest enhancing region ("hot spots") …
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Silicon nano-structure fabrication and application for surface-enhanced Raman spectroscopy
… on micro- and mesoscale nonplanar surfaces, a nano-pillar forest is fabricated on nonplanar silicon surfaces in various morphologies such as silicon atomic force microscopy (AFM) tips and pyramidal pits. By integrating nano-pillars on inverse silicon micro-pyramid array devices, we …
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3-D Topology Optimization of Spatially Averaged Surface-Enhanced Raman Devices
… light-emitting diodes, thermal emitters, and Raman sensing. Previous efforts in full-scale topology optimization for Surface Enhanced Raman Sensing (SERS) have predominantly focused on single particle emissions or two-dimensional systems, which are impractical for actual fabrication. An …
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Surface enhanced Raman spectrometry of C₆₀ in an electron tunneling gap
… using electromigration on a silicon substrate. Raman spectra were obtained for various features of this device in order to detect the presence of C6o and study its electronic properties. The 532 nm laser source showed Raman peaks at 300,522,930-980, 1570, 1900 and 2150 cm-¹ and the 632 nm laser …
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