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Characterization Of Interphases Between Pmda 4 Bdaf Polyimides And Silver Substrates Using Surface Enhanced Raman Scattering And Reflection Absorption Infrared Spectroscopy
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Book Synopsis Characterization of Interphases Between PMDA/4-BDAF Polyimides and Silver Substrates Using Surface-Enhanced Raman Scattering and Reflection- Absorption Infrared Spectroscopy by :
Download or read book Characterization of Interphases Between PMDA/4-BDAF Polyimides and Silver Substrates Using Surface-Enhanced Raman Scattering and Reflection- Absorption Infrared Spectroscopy written by and published by . This book was released on 1990 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) and reflection-absorption infrared spectroscopy (RAIR) were used to determine the molecular structure of interphases formed by curing the polyamic acid of pyromellitic dianhydride (PMDA) and 2,2-BIS(4-(4-aminophenoxy)-phenyl)-hexafluoropropane (4-BDAF) against silver substrates. SERS spectra of the cured polymer were more simular to the SERS spectra of the polyamic acid than to the normal Raman spectrum of the polymide, indicating that curing of the polymer was inhibited by interaction of the polyamic acid with the substrate. Thus, the strongest band in the normal RAMAN spectrum of the polymide was near 1406 cm-1 and was assigned to the CNC axial stretching mode.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Polymer/Inorganic Interfaces: Volume 304 by : Robert L. Opila
Download or read book Polymer/Inorganic Interfaces: Volume 304 written by Robert L. Opila and published by . This book was released on 1993-09-17 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-destructive Characterization of Polyimide/silver Interphases Using Surface-enhanced Raman Scattering by : Jin-Ter Young
Download or read book Non-destructive Characterization of Polyimide/silver Interphases Using Surface-enhanced Raman Scattering written by Jin-Ter Young and published by . This book was released on 1990 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-Destructive Characterization of Polymer/Metal Interphases Using Surface-Enhanced Raman Scattering by : F. J. Boerio
Download or read book Non-Destructive Characterization of Polymer/Metal Interphases Using Surface-Enhanced Raman Scattering written by F. J. Boerio and published by . This book was released on 1990 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface enhanced Raman scattering (SERS) is an analytical technique in which the Raman scattering cross sections of molecules adsorbed onto the roughened surfaces of certain metals are enhanced by as much as six orders of magnitude compared to their value for normal Raman scattering. The mechanisms are associated with the large electric fields that can be induced at the surfaces of metal particles having small radii of curvature and with formation of charge transfer complexes between the adsorbed molecules and the substrate. Enhancement due to the charge transfer mechanism is obtained only for molecules immediately adjacent to the surface but enhancement due to the electromagnetic mechanism may extend several monolayers away from the surface. Since normal Raman scattering by polymers is weak and scattering by molecules adjacent to the substrate is strongly enhanced, SERS can be used for nondestructive characterization of interfaces between polymer films and metals. Silver, Polymers, Materials, Acrylic monomer, Cumene, Hydroperoxide(CHP), Acetylphenylhydrazine(APH), Saccharin, Adhesives, Pyromellitic diimide (PMDI), Surface properties. (JG).
Book Synopsis Government reports annual index by :
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-Destructive Characterization of Polymer/Metal Interfaces Using Surface-Enhanced Raman Scattering (SERS). by : F. J. Boerio
Download or read book Non-Destructive Characterization of Polymer/Metal Interfaces Using Surface-Enhanced Raman Scattering (SERS). written by F. J. Boerio and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) is an analytical technique in which the Raman scattering cross-sections of molecules adsorbed onto the roughened surfaces of certain metals are enhanced by as much as six orders of magnitude compared to their value for normal Raman scattering. Many models have been proposed to explain SERS, but it is now considered that most of the enhancement is related to two mechanisms. The first is associated with the large electric fields that can be induced at the surfaces of metal particles having small radii of curvature. The second is associated with formation of charge-transfer complexes between the adsorbed molecules and the substrate. Enhancement due to the charge transfer mechanism is obtained only for molecules immediately adjacent to the surface, but enhancement due to electromagnetic mechanism may extend several monolayers away from the surface. Considering that normal Raman scattering by polymers is weak and that scattering by molecules adjacent to the substrate is strongly enhanced, it is evident that SERS can be used for non-destructive characterization of interfaces between polymer films and metals as long as the films are not so thick that scattering by the bulk of the film is comparable in intensity to SERS from the interface. Keywords: DD Form 1473, Nondestructive characterization, Polymer/Metal interfaces, Surface-enhanced raman scattering, SERS, Adsorption, Silver, Acrylic adhesive system.
Book Synopsis Vibrational Spectroscopy at Electrified Interfaces by : Andrzej Wieckowski
Download or read book Vibrational Spectroscopy at Electrified Interfaces written by Andrzej Wieckowski and published by John Wiley & Sons. This book was released on 2013-07-15 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the latest theory, techniques, and applications Surface vibrational spectroscopy techniques probe the structure and composition of interfaces at the molecular level. Their versatility, coupled with their non-destructive nature, enables in-situ measurements of operating devices and the monitoring of interface-controlled processes under reactive conditions. Vibrational Spectroscopy at Electrified Interfaces explores new and emerging applications of Raman, infrared, and non-linear optical spectroscopy for the study of charged interfaces. The book draws from hundreds of findings reported in the literature over the past decade. It features an internationally respected team of authors and editors, all experts in the field of vibrational spectroscopy at surfaces and interfaces. Content is divided into three parts: Part One, Nonlinear Vibrational Spectroscopy, explores properties of interfacial water, ions, and biomolecules at charged dielectric, metal oxide, and electronically conductive metal catalyst surfaces. In addition to offering plenty of practical examples, the chapters present the latest measurement and instrumental techniques. Part Two, Raman Spectroscopy, sets forth highly sensitive approaches for the detection of biomolecules at solid-liquid interfaces as well as the use of photon depolarization strategies to elucidate molecular orientation at surfaces. Part Three, IRRAS Spectroscopy (including PM-IRRAS), reports on wide-ranging systems from small fuel molecules at well-defined surfaces to macromolecular complexes that serve as the building blocks for functional interfaces in devices designed for chemical sensing and electric power generation. The Wiley Series on Electrocatalysis and Electrochemistry is dedicated to reviewing important advances in the field, exploring how these advances affect industry. The series defines what we currently know and can do with our knowledge of electrocatalysis and electrochemistry as well as forecasts where we can expect the field to be in the future.
Book Synopsis Characterization of Substrates for Surface-enhanced Raman Scattering by : B. M. Atkinson
Download or read book Characterization of Substrates for Surface-enhanced Raman Scattering written by B. M. Atkinson and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polymerization of Nitro Compounds on Silver Surfaces During Surface-Enhanced Raman Scattering by :
Download or read book Polymerization of Nitro Compounds on Silver Surfaces During Surface-Enhanced Raman Scattering written by and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering was observed from thin films formed by 1,4- and 1,3-dinitrobenzene spin-coated onto silver island films from dilute solutions. During laser irradiation of 1,4-DNB films on silver substrates at relatively high laser powers, new bands appeared near 1152, 1350, 1412, and 1460/cm and bands near 1118, 1358, and 1372/cm decreased in intensity. A band near 1598/cm shifted to near 1605/ cm. The bands near 1152 and 1412/ cm were assigned to stretching modes of Phi-N and -N=N- bonds of azo compounds, respectively, indicating that polymerization of 1,4-DNB had occurred. The extent of polymerization was greatest when the surface coverage of adsorbed 1,4-DNB was greatest and when the SERS experiments were carried out in a nitrogen atmosphere, indicating that reducing conditions were required for the polymerization. No polymerization was observed for 1,3-DNB under similar circumstances. The difference was attributed to orientation of the adsorbed species. Thus, it was concluded that 1,4-DNB was adsorbed with a horizontal configuration in which the aromatic rings were parallel to the substrate surface and both nitro groups were in contact with the surface while 1,3-DNB was adsorbed with a vertical configuration in which the rings were perpendicular to the surface and only one nitro group was in contact with the surface.
Book Synopsis Analysis of Thin Silver Films as a Practical Surface-enhanced Raman Scattering Substrate for Analytical Applications by : Vicki Schlegel
Download or read book Analysis of Thin Silver Films as a Practical Surface-enhanced Raman Scattering Substrate for Analytical Applications written by Vicki Schlegel and published by . This book was released on 1987 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Generation and Optical Properties of Silver Surface Enhanced Raman Scattering Substrates by : Peter Christian Andersen
Download or read book Generation and Optical Properties of Silver Surface Enhanced Raman Scattering Substrates written by Peter Christian Andersen and published by . This book was released on 2003 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chemical Resonance Effects in Surface-enhanced Raman Scattering of Nucleic Acid-Silver Composites by : Lindsay Michelle Freeman
Download or read book Chemical Resonance Effects in Surface-enhanced Raman Scattering of Nucleic Acid-Silver Composites written by Lindsay Michelle Freeman and published by . This book was released on 2016 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although surface-enhanced Raman spectroscopy (SERS) has been a valuable tool for chemical detection, the understanding of the contributions of the chemical enhancement effect in nucleic acid-silver composites remains limited. Nucleic acid-silver composites have unique optical properties such as fluorescence and enhanced Raman generation, and thus need to be further analyzed and characterized. In this dissertation, the static polarizability chemical effect is used to determine the preferential binding sites of nucleic acids to silver nanoparticles. The binding configuration dictates the optical properties, so it is imperative to determine which atoms are binding to the silver structures. Time-dependent density functional theory simulations are used to calculate the Raman frequencies of several systems and are then quantitatively compared to experimental measurements. The approximate composition of the binding sites for each nucleic acid to silver films is determined using the simulated Raman correlation spectroscopy process. In the second part of the dissertation, the charge-transfer effect in nucleic acid-silver composites is harnessed in order to selectively enhance or reduce the SERS signals via wavelength selection. Depending on the molecular properties of the nucleic acids, the optimal excitation wavelength shifts from visible to near-infrared. The properties can be taken advantage of to better control the systems under study. The charge-transfer effect is further understood by utilizing a thin film of aluminum oxide to prevent electron transfer from occurring, and thus enabling the calculation of the order of magnitude of the charge-transfer effect. The characterization of nucleic acid-silver composites is imperative to fully understanding the unique and exciting properties that these systems provide. While SERS has been limited in terms of DNA detection or sequencing, the restrictions have been caused by insufficient information. This dissertation offers additional information on the systems and explains the discrepancies seen in previous measurements of nucleic acid-silver composites.
Book Synopsis Surface-Enhanced Raman Spectroscopy of Pentaammineosmium(III)/(II) and Pentaammineruthernium(II) Containing Pyridine, Pyrazine, Or 4,4'-Bipyridine Ligands at Silver Electrodes: Vibrational Assignments by : S. Farquharson
Download or read book Surface-Enhanced Raman Spectroscopy of Pentaammineosmium(III)/(II) and Pentaammineruthernium(II) Containing Pyridine, Pyrazine, Or 4,4'-Bipyridine Ligands at Silver Electrodes: Vibrational Assignments written by S. Farquharson and published by . This book was released on 1984 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed vibrational assignments are described for Surface Enhanced Raman (SER) spectra of pentaamminoeosmium(III), (II) and pentaammineruthenium(II) containing pyridine (py), pyrazine (pz), and 4,4'-bipyridine (bpy) ligands adsorbed at the silver-aqueous interface. The assignments are based on group symmetry analysis, deuteration effects, and by comparison with corresponding normal Raman and infrared spectra for the solid-phase complexes and surface and bulk Raman spectra for the corresponding free ligands. Most bands present in the normal Raman and/or infrared spectra also appear in the SER spectra. This results from the high intensity of the SER spectra along with the relaxation of vibrational selection rules for adsorbed molecules. The appearance of intense SER spectra for Os(NH3)5py(III)/(II) and RuII(NH3)5py is noteworthy since unlike free pyridine, these lack an available nitrogen for surface coordination. The results illustrate the virtues of electrochemical SER spectroscopy for examining the detailed vibrational properties of coordination compounds, including those in oxidation states (such as Os(II) here) that are difficult to obtain pure in bulk media. (Author).
Book Synopsis The Effect of Phosphorothioate-modified DNA and Nanoparticle Size on Quantitative Enhanced Raman Scattering by : Richard Nicholas Cassar
Download or read book The Effect of Phosphorothioate-modified DNA and Nanoparticle Size on Quantitative Enhanced Raman Scattering written by Richard Nicholas Cassar and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) has been used successfully as an ultrasensitive technique for the direct analysis of dye-labelled oligonucleotides using aggregated silver nanoparticles. Key to this technique are the SERS probe and SERS substrate. Initial studies were made on the detection of phosphorothioate modified TAMRA-labelled oligonucleotides whereby a non-bridging oxygen atom in the phosphodiester backbone is replaced by sulfur. TAMRA-labelled phosphorothioate oligonucleotides with the same base pair sequence but different number of modified phosphate unites were compared to unmodified TAMRA-labelled oligonucleotides using silver nanoparticles (AgNP) as SERS substrates using different aggregation agents. Furthermore the investigation was extended to study the effect of modification in the detection of double stranded DNA (dsDNA). The focus was then turned to the SERS substrate since spherical and monodispersed silver nanoparticles are ideal for fundamental research as the contribution from size and shape can be accounted for in the experimental design. Different methods to produce size tuneable AgNP's were investigated to study in detail the effect of modified and unmodified dye-labelled oligonucleotides, thiophenol (TP), rhodamine 6G (R6G) and malachite green oxalate (MGO) on the SERS response. The results obtained reflect the importance of each component of SERS. The phosphorothioate modifications, although their affinity towards silver surfaces can improve the DNA limit of detection (LOD), it also depends on the position and number of modifications and on the aggregating agent used which in itself also effects the LOD of DNA. The same applies for the SERS substrate where an increase in particle size results in an increased enhancement of the analyte's Raman signal but further size increments leads to a decrease in SERS intensity due to other factors such as scattering. This demonstrates the importance of choosing the right experimental setups for DNA SERS analysis, as to obtain the right balance where all factors work synergistically with each other.
Book Synopsis Using Correlated Super-resolution Optical and Structural Studies to Investigate Surface-enhanced Raman Scattering on Silver & Gold Nanoparticles by : Maggie Leona Weber
Download or read book Using Correlated Super-resolution Optical and Structural Studies to Investigate Surface-enhanced Raman Scattering on Silver & Gold Nanoparticles written by Maggie Leona Weber and published by . This book was released on 2015 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) from organic molecules is used to study how geometry affects plasmonic enhancement in noble metal nanoparticles using super-resolution analysis techniques coupled with scanning electron microscope (SEM) imaging. We demonstrate that super-resolution analysis can track emission from Raman-active molecules on nanoaggregate surfaces with resolution typically better than 5 nm, a significant improvement over the diffraction limit. This optical analysis technique is used to identify active junction regions, known as hot spots, in correlated SEM structural images of aggregated particles based on shape, size, and angular position of SERS emission. This correlated analysis is further extended to study the mechanism of silver nanoparticle luminescence and its positional relationship to SERS emission. These studies support the hypothesis that silver luminescence is enhanced via a different mechanism than SERS. Discrete dipole approximation calculations agree with experimental results, indicating that SERS emission is a product of local plasmonic enhancement in specific junction regions between nanoparticles whereas silver luminescence is dependent upon nanoaggregate geometry and the collective plasmon modes within a structure. These theoretical calculations of luminescence centroid location can assist with SERS-active junction region assignment in higher order aggregates (e.g. trimers, tetramers, etc.) Finally, correlated optical and structural studies are used to develop understanding of site-specific electrochemical potentials on silver and gold nanoparticle aggregates using a redox active Raman reporter molecule. We demonstrate that there is a weak correlation between emission centroid location and bulk sample potential. Silver colloid studies demonstrate variability in modulation behavior and are highly unpredictable, whereas gold colloids with the redox molecule covalently tethered to their surface via a gold-thiol bond show more reproducible modulation. Furthermore, these tethered studies demonstrate geometrical agreement between site-specific emission at negative potentials and junction regions in nanoaggregate SEM images indicating that plasmonic enhancement may affect local nanoparticle surface potentials.
