Download or read book In situ Surface Enhanced Raman Spectroscopy Investigation of the Surface Films on Alloy 600 and Alloy 690 in Pressurized Water Reactor Primary Water written by Feng Wang and published by . This book was released on 2012 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alloy 600 is found to be susceptible to stress corrosion cracking (SCC) in Pressurized Water Reactor (PWR) primary water environment. In this study, in-situ Surface Enhanced Raman Spectroscopy (SERS) is used to characterize surface films formed on Alloy 600 and Alloy 690 in PWR PW at 320oC. A simulated PWR PW system is constructed. In addition, a titanium autoclave is designed for high-temperature electrochemical tests. In this study, we have also measured SERS spectra of surface films formed on unalloyed nickel, unalloyed chromium, Ni-5Cr-8Fe, Ni-10Cr-8Fe, Ni-10Cr and Ni-20Cr. The surface films were formed at different potentials, from -0.9V to -0.5V vs SHE. A formation of NiO film is observed on the surface of nickel at -0.65V, which shows a Raman peak at 540 cm-1 due to crystal defects. For pure chromium, Cr2O3 passive film is formed on its surface. The Raman peaks are located at 540 cm-1 and 610 cm-1. The thickness of Cr2O3 passive film is about several nanometers, depending on the growth time in PWR PW. A peak at 610 cm-1 would likely indicate Cr2O3 and the absence of this peak, in conjunction with a peak at 540 cm-1, would indicate NiO. It is found that the surface films on Ni-5Cr-8Fe and Ni-10Cr-8Fe alloys are composed of Cr2O3 and FeCr2O4 spinel. No spinel oxide peak is observed in the SERS spectra for Ni-10Cr and Ni-20Cr binary alloys, and the surface film on both alloys is Cr2O3. An analysis of SERS spectra indicate that, as alloy's chromium concentration increases, the amount of Cr2O3 included in the alloy's surface film would increase. The surface film of Alloy 600 is composed of Cr2O3 inner layer (IL) and FeCr2O4 outer layer (OL). For short-time growth (10 min), the inner Cr2O3 layer is about 2 - 4 nm thick, and the average size of FeCr2O4 crystallites is about 10 nm. The actual film thickness depends on the growth time and aqueous environment. The surface film formed on Alloy 600 in PWR PW has a minor change if the sample is removed from the autoclave and exposed to air. The surface film of Alloy 690 is entirely a single layer of Cr2O3 (~ 2 nm thick). According to Diffusion Path Analysis, the difference on surface films formed on Alloy 600 and Alloy 690 is a consequence of a change in the relative diffusivity of O and Cr. Our in-situ SERS spectra measured for surface films on Alloy 600 and Alloy 690 are different with most of other people's findings. Three aspects have been considered and discussed. The first, there might be a difference between in-situ and ex-situ characterization techniques. The second, the film growth time in PWR PW is significantly different. The third, different autoclaves are used. The recirculating titanium autoclave is used in this study, while stainless steel autoclave is used in most of other studies, which might cause a change of the concentration of cations in the vicinity of metal surface and a precipitation of cations on the surface of oxides. It is found that the exposure time and testing autoclave might be responsible for the discrepancies between this study and the earlier studies. By using in-situ Surface Enhance Raman Spectroscopy (SERS), we have investigated the surface oxides formed on Alloy 600, Alloy 690, Ni-Cr, and Ni-Cr-Fe alloys in PWR primary water at 320oC. Our in-situ SERS spectra results suggest that SCC susceptibility of Ni-based alloys might be correlating with a formation of surface films formed in PWR primary water.

Download or read book Application of Surface Enhanced Raman Spectroscopy SERS to In situ Study of Passive Films on Iron and Steel in Aqueous Solutions written by Jing Gui and published by . This book was released on 1991 with total page 528 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 1998 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface enhanced Raman Spectroscopy Investigation of Surfaces and Interfaces in Thin Films on Metals written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ein neuartiges Substrat für die oberflächenverstärkte Ramanspektroskopie (SERS) wurde mittels plasmagestützter chemischer und physikalischer Aufdampfabscheidung entwickelt. Die Herstellung dieses SERS-Substrates ist relativ unkompliziert und reproduzierbar. Der Verstärkungsfaktor von 105 bis zu 107 konnte für verschiedene Probensysteme erreicht werden. SERS-Untersuchungen des Wachstums ultradünner Organosiloxan-Plasmapolymerschichten konnten mit dem "First-Layer-Verstärkung-Mechanismus" erklärt werden. Weiterhin wurden SERS-Untersuchungen von plasmamodifizierten metallischen Schichten, Kohlenstoffnanoröhren und Polystyrolschichten durchgeführt. Insbesondere wurde das kinetische Adsorbieren von 2-Mercapto-benzothiazol auf den Silberoberflächen mittels In-situ SERS untersucht. Es wurde demonstriert, dass die Kombination von SERS und Quarzmikrowägung einen tieferen Einblick in den Adsorptionsmechanismus von organischen Molekülen auf metallischen Oberflächen ermöglichen.

Download or read book Surface Infrared and Raman Spectroscopy written by W. Suëtaka and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: are intended to fill the gap between a manufacturer's handbook, and review articles that highlight the latest scientific developments. A fourth volume will deal with techniques for specimen handling, beam artifacts, and depth profiling. It will provide a compilation of methods that have proven useful for specimen handling and treatment, and it will also address the common artifacts and problems associated with the bombardment of solid sur faces by photons, electrons, and ions. A description will be given of methods for depth profiling. Surface characterization measurements are being used increasingly in di verse areas of science and technology. We hope that this series will be useful in ensuring that these measurements can be made as efficiently and reliably as possible. Comments on the series are welcomed, as are suggestions for volumes on additional topics. C. J. Powell Gaithersburg, Maryland A. W. Czandema Golden, Colorado D. M. Hercules Pittsburgh, Pennsylvania T. E. Madey New Brunswick, New Jersey J. T. Yates, Jr.

Download or read book The Application of Surface Enhanced Raman Spectroscopy to the In Situ Study of Passivity and Inhibition written by Lucy Jane Oblonsky and published by . This book was released on 1993 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Enhanced Raman Scattering written by Katrin Kneipp and published by Springer Science & Business Media. This book was released on 2006-06-21 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost 30 years after the first reports on surface-enhanced Raman signals, the phenomenon of surface-enhanced Raman scattering (SERS) is now well established. SERS gained particular interest after single-molecule Raman spectroscopy had been demonstrated. This book summarizes and discusses present theoretical approaches that explain the phenomenon of SERS and reports on new and exciting experiments and applications of the fascinating spectroscopic effect.

Download or read book Surface enhanced Raman Spectroscopy Investigation of Surfaces and Interfaces in Thin Films on Metals written by Guoguang Sun and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Surface Enhanced Raman Spectroscopy written by Sebastian Schlücker and published by John Wiley & Sons. This book was released on 2011-09-19 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basic theoretical and practical knowledge to new exciting developments in the field with a focus on analytical and life science applications, this monograph shows how to apply surface-enhanced Raman scattering (SERS) for solving real world problems. From the contents: * Theory and practice of SERS * Analytical applications * SERS combined with other analytical techniques * Biophysical applications * Life science applications including various microscopies Aimed at analytical, surface and medicinal chemists, spectroscopists, biophysicists and materials scientists. Includes a Foreword by the renowned Raman spectroscopist Professor Wolfgang Kiefer, the former Editor-in-Chief of the Journal of Raman Spectroscopy.

Download or read book Raman Spectroscopy written by Gustavo Morari Do Nascimento and published by BoD – Books on Demand. This book was released on 2018-04-18 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a wide overview of the state-of-the-art applications of Raman spectroscopy in characterization of materials and biomaterials. The Raman signal is intrinsically smaller than other vibrational techniques; however, mainly through intensification processes, such as resonance Raman (RR) and surface-enhanced Raman spectroscopy (SERS), the Raman cross section can be strongly amplified. Thoroughly in these signal amplifications, the study of a diversity of chemical systems and the use of Raman technique for in situ and in vivo measurements is possible. The main goal of this book is to open up to an extended audience the possibilities of uses of Raman spectroscopy. In fact, this collective work will be beneficial to students, teachers, and researchers of many areas who are interested to expand their knowledge about Raman spectroscopy applied to nanotechnology, biotechnology, environmental science, inorganic chemistry, and health sciences.

Download or read book Surface And Tip Enhanced Raman Spectroscopy for Catalysis written by Bert M. Weckhuysen and published by . This book was released on 2021-12-07 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning with a look at the theory behind the techniques this book provides a practical and hands-on description of the various methods of Surface- and Tip-Enhanced Raman Spectroscopy.

Download or read book Surface enhanced Raman Scattering SERS Surfaces for In situ Trace Analysis of PAHs in Water by Shifted Excitation Raman Difference Spectroscopy SERDS written by and published by . This book was released on 2012 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Enhanced Raman Scattering written by Richard Kounai Chang and published by Springer. This book was released on 1982-03 with total page 438 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 Ultrahigh vacuum Studies of Surface Enhanced Raman Scattering from Absorbates on Modulated Silver Surfaces written by Pia Naoko Sanda and published by . This book was released on 1982 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Enhanced Raman Spectroscopy of Functionalized Self assembled Monolayers written by Qi Ye and published by . This book was released on 1997 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface enhanced Raman Spectroscopy with Abrasively Modified Fiber Optic Probes written by Ken I. Mullen and published by . This book was released on 1991 with total page 2199 pages. Available in PDF, EPUB and Kindle. Book excerpt: