Download or read book An Examination of the Relationship Between Surface Enhanced Raman Scattering SERS Intensities and Surface Concentration for Pyridine Adsorbed at the Polycrystalline Gold Aqueous Solution Interface written by L. Stolberg and published by . This book was released on 1990 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface enhanced Raman scattering (SERS) data are presented for pyridine adsorbed onto both smooth and roughened polycrystalline gold electrode surfaces. It was found that, for smooth surfaces, time independent (stable to within 10% of the initial value) intensities of the totally symmetric ring breathing mode of pyridine could be measured by applying slow oxidation-reduction cycles between each intensity measurement. The potential and concentration dependence of the intensity of the band was therefore determined. Independently, the isotherms for pyridine adsorption at smooth polycrystalline gold surfaces were obtained using chronocoulometry. The SERS data are compared to the surface concentration coverages and deviate, becoming inverse, above half coverage concentrations. Lastly, the effect of surface roughness on the potential and concentration dependence of pyridine SERS was studied. No correlation between the SERS data from rough electrode surfaces and adsorption isotherms determined at a smooth surface was found. Keywords: Surface enhanced Raman scattering; Gold surfaces; Correlation; Surface concentration; Electrochemical measurements; Raman intensity. (jes).
Download or read book An Examination of the Relationship Between SERS Intensities and Surface Concentration for Pyridine Adsorbed at the Gold Aqueous Solution Interface written by L. Stolberg and published by . This book was released on 1990 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the relationship between surface enhanced Raman scattering and surface concentrations of molecules is essential to gaining an understanding of the mechanism of SERS. At the metal/solution interface very few such studies have been reported. Here we present SERS data for pyridine adsorbed at the polycrystalline gold/aqueous solution interface, for which we also have data for surface coverage. SERS data for both smooth and rough electrode surfaces are presented. Chronocoulometry has been used to obtain reliable surface concentration data for pyridine adsorbed at the polycrystalline gold/aqueous solution interface. SERS data for both smooth and rough electrode surfaces have also been collected. Raman intensities of the 1010 cm-1 band of pyridine, measured for various bulk pyridine concentrations, track the surface concentration data very well for surface concentrations less than 3.2 x 10-10 mol cm-2. The SERS data for roughened gold electrode surfaces do not correspond well to the surface concentration data. SERS generates strong signals at cathodic potentials for which the surface concentrations are small on smooth gold electrodes. Keywords: Surface enhanced raman scattering; Pyridine on smooth gold electrodes; Electrochemical and spectroscopic data correlated; Surface roughness considered.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Twelfth International Conference on Raman Spectroscopy written by James R. Durig and published by Wiley. This book was released on 1990-08-03 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the texts of the plenary and contributed papers presented at the 12th International Conference on Raman Spectroscopy at the University of South Carolina. Forty invited contributors explore all aspects of the subject, including biological systems, semiconductors, high Tc superconductors, nonlinear techniques, the solid state, and Raman techniques and applications. This compilation provides a reasonable record of the research activity in the field and documents that Raman spectroscopy remains an invaluable technique for use in many of the cutting edge research areas of biology, chemistry, and physics. In fact, in many cases the information and data included are difficult or nearly impossible to obtain by any other technique.
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990-12 with total page 1324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1991 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACS Directory of Graduate Research 1993 written by American Chemical Society. Committee on Professional Training and published by . This book was released on 1993 with total page 1700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Enhanced Raman Scattering written by Richard Chang and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the course of the development of surface science, advances have been identified with the introduction of new diagnostic probes for analytical characterization of the adsorbates and microscopic structure of surfaces and interfaces. Among the most recently de veloped techniques, and one around which a storm of controversy has developed, is what has now been earmarked as surface enhanced Raman scattering (SERS). Within this phenomenon, molecules adsorbed onto metal surfaces under certain conditions exhibit an anomalously large interaction cross section for the Raman effect. This makes it possible to observe the detailed vibrational signature of the adsorbate in the ambient phase with an energy resolution much higher than that which is presently available in electron energy loss spectroscopy and when the surface is in contact with a much larger amount of material than that which can be tolerated in infrared absorption experiments. The ability to perform vibrational spectroscopy under these conditions would lead to a new understanding about the chemical identity, geome try, and bonding of adsorbed material at a level previously unacces sible. It is for these reasons that the last few years have brought an explosion of activity surrounding the exploitation of SERS. The search for the origines) of the anomalous enhancement has given rise to a research sub-activity of its own. Efforts to explain the en hancement have led to an increased understanding of the whole range of phenomena associated with the interaction of photons with adsor bates and metal surfaces.
Download or read book Surface Enhanced Raman Scattering New Theoretical Approaches Materials and Strategies written by Ivano Alessandri and published by Frontiers Media SA. This book was released on 2020-03-25 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frontiers of Surface Enhanced Raman Scattering written by Yukihiro Ozaki and published by John Wiley & Sons. This book was released on 2014-02-19 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive presentation of Surface-Enhanced Raman Scattering (SERS) theory, substrate fabrication, applications of SERS to biosystems, chemical analysis, sensing and fundamental innovation through experimentation. Written by internationally recognized editors and contributors. Relevant to all those within the scientific community dealing with Raman Spectroscopy, i.e. physicists, chemists, biologists, material scientists, physicians and biomedical scientists. SERS applications are widely expanding and the technology is now used in the field of nanotechnologies, applications to biosystems, nonosensors, nanoimaging and nanoscience.
Download or read book Surface Enhanced Raman Scattering written by Zhong-Qun Tian and published by John Wiley & Sons Incorporated. This book was released on 2010-06-14 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-Enhanced Raman Spectroscopy: Principles, Experiments, and Applications is a comprehensive, up to date, and balanced treatment of the theoretical and practical aspects of Surface-Enhanced Raman Scattering (SERS), a useful branch of spectroscopy for several areas of science. This book describes the basic principles of SERS, including SERS mechanisms, performing SERS measurements, and interpreting data. Also emphasized are applications in electrochemistry; catalysis; surface processing and corrosion; Self-Assemble-Layer and L-B Films; polymer science; biology; medicine and drug analysis; sensors; fuel cells; forensics; and archaeology. It is an essential guide for student and professional analytical chemists.
Download or read book Surface Enhanced Raman Scattering for Redox Active Adsorbates Pentaammineosmium III II and Pentaammineruthenium II Containing Nitrogen Heterocycle Ligands 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: Surface-Enhanced Raman Scattering (SERS) for pentaammineosmium (III) and pentaammineruthenium(II) containing pyridine (py), pyrazine (pz), or 4,4'-bipyridine (bpy) ligands adsorbed at the silver-aqueous interface has been examined as a function of electrode potential to explore vibrational changes associated with electron transfer involving simple adsorbates. SERS was observed for the pyridine complexes despite their lack of an unshared electron pair for surface binding, although more intense spectra were obtained for the pyrzine and bipyridine complexes which contain a remote nitrogen lone pair. SER vibrational bands for metal-ligand and internal ammine modes were observed in addition to those due to heterocycle ring modes. Marked shifts were observed in the frequency of several, vibrational bands for adsorbed Os(NH3)5py and Os(NH3)5pz as the electrode potential was made more negative that are consistent with the reduction fo Os(III) to Os(II). The potential-dependent concentrations of adsorbed Os(III) and Os(II) as determined using SERS are in good agreement with those obtained from rapid cyclic voltammetry. The bulk-phase Raman spectra exhibit resonance enhancement.
Download or read book Selected Papers on Surface enhanced Raman Scattering written by Milton Kerker and published by . This book was released on 1990 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Developments In Plasmon supported Raman Spectroscopy 45 Years Of Enhanced Raman Signals written by Katrin Kneipp and published by World Scientific. This book was released on 2017-12-12 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface enhanced Raman scattering (SERS) might be one of the most impressive effects to demonstrate the power of plasmonic approaches in spectroscopy and became one of the 'triggers' for the rapidly emerging field of plasmonics.This book provides a review of some recent developments in SERS, such as tip enhanced Raman scattering (TERS), reports new experimental observations, sophisticated new SERS-active structures and substrates, new theoretical insight to explain the effect as well as exciting applications in various fields such as analytical science, biomedicine and nanotechnology.Written for graduate students and established researchers looking for inspiration for future work, its interdisciplinary nature makes the book suitable for readers in the fields of chemistry, physics, biology, medicine, nanotechnology and materials science.
Download or read book Surface Enhanced Raman Spectroscopy of Electrochemically Characterized Interfaces Relations Between Raman Scattering Intensity and Surface Coverage for Simple Anionic Adsorbates written by M. J. Weaver and published by . This book was released on 1983 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-Enhanced Raman Scattering (SERS) obtained as a function of electrode potential for chloride, bromide, iodide, thiocyanate, azide, and cyanide adsorbed at roughened silver electrodes are compared with corresponding surface concentration-potential data extracted from differential capacitance measurements in order to examine the relation between SERS and surface coverage for these structurally simple adsorbates. After generating SERS by means of an oxidation-reduction cycle, it was found that altering the potential to a more negative value, where the adsorbate coverage fell below a monolayer, corresponded closely in most cases to the onset of a potential-dependent decay in the SERS intensity. Monitoring the potential dependence of the Raman intensity with an Optical Multi-channel Analyzer as well as with a conventional scanning spectrometer allowed a rapid reversible component of the potential dependence to be separated from an additional irreversible signal decay associated with the loss of Raman-active sites. The present results suggest that the adsorption energetics of the Raman-active surface sites do not differ substantially from those for the sites occupied by the majority of the adsorbate.
