Download or read book Ag Nanostructures Application in Surface Enhanced Raman Spectroscopy written by Alfred Maingi and published by LAP Lambert Academic Publishing. This book was released on 2011-08 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent contamination of food by the use of melamine has led to huge economic losses in the food industry. Food and drug administration (FDA) currently uses methods that are laborious and time consuming. As a consequence scientists have been grappling with development of methods that are more efficient and cost effective for trace analysis of various food adulterates. One such method is the use of silver nanostructures in the presence of Surface Enhanced Raman spectroscopy that are capable of generating high enhancement of the signals, leading to low detection of the signals from the analyte. In the book, a literature review of the various synthesis methods, purification of the end products, assembly of nanostructures on glass templates as well as characterization of silver nanowires/nanoparticles and their potential use in Surface Enhanced Raman Spectroscopy is suggested.
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 Spectroscopy for Biophysical Applications written by Claudia Fasolato and published by Springer. This book was released on 2018-12-05 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book explores the phenomenon of surface-enhanced Raman scattering (SERS), the huge amplification of Raman signal from molecules in the proximity of a metallic nanostructured surface, allowing readers to gain an in-depth understanding of the mechanisms affecting the spectroscopic response of SERS-active systems for effective applications. SERS spectroscopy is an ultrasensitive analytical technique with great potential for applications in the field of biophysics and nanomedicine. As examples, the author presents the design of nanocolloid-based SERS-active substrates for molecular sensing and of a folate-based SERS-active nanosensor capable of selectively interacting with cancer cells, enabling cancer diagnostics and therapy at the single-cell level. The author also suggests novel paths for the systematization of the SERS nanosystem design and experimental protocols to maximize sensitivity and reproducibility, which is essential when real-world biomedical applications are the goal of the study. With a combined approach, both fundamental and applied, and a detailed analysis of the state of the art, this book provides a valuable overview both for students new to SERS spectroscopy and for experts in the field.
Download or read book Spark Ablation written by Andreas Schmidt-Ott and published by CRC Press. This book was released on 2019-12-19 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spark ablation has been used worldwide for decades. However, in many fields, the special properties of nanoparticles, which come into play especially for sizes
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 Synthesis of Complex Plasmonic Nanostructures for Applications in Surface enhanced Raman Spectroscopy and Biomedicine written by Claire Margaret Cobley and published by . This book was released on 2010 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research centers around techniques to engineer the properties of noble-metal nanostructures for applications in surface-enhanced Raman spectroscopy (SERS) and biomedicine. Many of these potential applications are made possible by the strong localized surface plasmon resonance (LSPR) of noble-metal nanostructures, which is heavily influenced by the particle's morphology. The first part of this work focuses on the solution-phase synthesis of Ag nanostructures. In this section, I demonstrate the synthesis of Ag nanostructures with two different morphologies that are interesting for fundamental SERS studies: anisotropically truncated octahedrons and large, single-crystalline spheres. In both syntheses, control over etching was critical to morphological control. The second part of this work discusses galvanic replacement reactions, which can be used to create a variety of hollow, porous nanostructures whose LSPR can be tuned into the near infrared region, a spectral range particularly interesting for biomedical applications due to reduced light attenuation in soft tissue. In this section, I will describe how the nanostructures resulting from galvanic replacement reactions can be engineered by controlling the morphology of the Ag nanostructures used as templates or the metal salt(s) titrated during the reaction. Specifically, I will discuss how the use of template particles with non-uniform surfaces influences the final morphology and how the progression of a galvanic replacement reaction using two different precursors (e.g. HAuCl4 and Na2PdC14) depends strongly on the order that they are added. In the final part of this work, I will discuss the biocompatibility of Au-Ag nanocages with different compositions and surface coatings and their use in two biomedical imaging techniques: as contrast agents in photoacoustic mapping of sentinel lymph nodes and as novel three-photon luminescence probes for in vitro imaging.
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 Plasmonic Nanostructures for Surface enhanced Raman Spectroscopy written by Ruiqian Jiang and published by . This book was released on 2014 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last three decades, a large number of different plasmonic nanostructures have attracted much attention due to their unique optical properties. Those plasmonic nanostructures include nanoparticles, nanoholes and metal nanovoids. They have been widely utilized in optical devices and sensors. When the plasmonic nanostructures interact with the electromagnetic wave and their surface plasmon frequency match with the light frequency, the electrons in plasmonic nanostructures will resonate with the same oscillation as incident light. In this case, the plasmonic nanostructures can absorb light and enhance the light scattering. Therefore, the plasmonic nanostructures can be used as substrate for surface-enhanced Raman spectroscopy to enhance the Raman signal. Using plasmonic nanostructures can significantly enhance Raman scattering of molecules with very low concentrations. In this thesis, two different plasmonic nanostructures Ag dendrites and Au/Ag core-shell nanoparticles are investigated. Simple methods were used to produce these two plasmonic nanostructures. Then, their applications in surface enhanced Raman scattering have been explored. Ag dendrites were produced by galvanic replacement reaction, which was conducted using Ag nitrate aqueous solution and copper metal. Metal copper layer was deposited at the bottom side of anodic aluminum oxide (AAO) membrane. Silver wires formed inside AAO channels connected Ag nitrate on the top of AAO membrane and copper layer at the bottom side of AAO. Silver dendrites were formed on the top side of AAO. The second plasmonic nanostructure is Au/Ag core-shell nanoparticles. They were fabricated by electroless plating (galvanic replacement) reaction in a silver plating solution. First, electrochemically evolved hydrogen bubbles were used as template through electroless deposition to produce hollow Au nanoparticles. Then, the Au nanoparticles were coated with Cu shells in a Cu plating solution. In the following step, a AgCN based plating solution was used to replace Cu shell to form Au/Ag core-shell nanoparticles. These two plasmonic nanostructures were tested as substrates for Raman spectroscopy. It demonstrated that these plasmonic nanostructures could enhance Raman signal from the molecules on their surface. The results indicate that these plasmonic nanostructures could be utilized in many fields, such as such as biological and environmental sensors.
Download or read book Raman Spectroscopy for Nanomaterials Characterization written by Challa S.S.R. Kumar and published by Springer Science & Business Media. This book was released on 2012-03-30 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: First volume of a 40-volume series on nanoscience and nanotechnology, edited by the renowned scientist Challa S.S.R. Kumar. This handbook gives a comprehensive overview about Raman spectroscopy for the characterization of nanomaterials. Modern applications and state-of-the-art techniques are covered and make this volume essential reading for research scientists in academia and industry.
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 Vibrational Spectroscopy written by Ricardo Aroca and published by John Wiley & Sons. This book was released on 2006-05-01 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Enhanced Vibrational Spectroscopy (SEVS) has reached maturity as an analytical technique, but until now there has been no single work that describes the theory and experiments of SEVS. This book combines the two important techniques of surface-enhanced Raman scattering (SERS) and surface-enhanced infrared (SEIR) into one text that serves as the definitive resource on SEVS. Discusses both the theory and the applications of SEVS and provides an up-to-date study of the state of the art Offers interpretations of SEVS spectra for practicing analysts Discusses interpretation of SEVS spectra, which can often be very different to the non-enhanced spectrum - aids the practicing analyst
Download or read book Synthesis of Ag Nano and Microstructures for Surface enhanced Raman Spectroscopy and Applications in Chemo and Biosensing written by Jian-Bing Hu and published by . This book was released on 2011 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Design and Synthesis of Nanomaterials for Surface enhanced Raman Scattering Fuel Cell Technology and Photonics written by Pedro Henrique Cury Camargo and published by . This book was released on 2009 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the first part of my dissertation, I developed two approaches for selectively probing the SERS activities of individual hot spots, i.e., experimentally detect the SERS signals only for the molecules that are trapped within the hot-spot region in individual Ag nanoparticle dimers. Then, I performed a systematic investigation on the SERS activity of individual dimers composed of two closed spaced Ag nanoparticles. By utilizing Ag nanoparticles displaying a variety of well-defined shapes, sizes and orientations to construct the dimers, I were able to precisely correlate the detected SERS signals to the specific geometry of individual hot spots. In the second part of this dissertation, I performed a systematic investigation on the galvanic replacement reaction between PtCl62- and Pd nanocrystals with well-defined shapes including octahedra, nanocubes, and nanorods. The resultant hollow Pd-Pt bimetallic nanostructures were employed as electrocatalysts for the oxygen reduction reaction (ORR). Our results demonstrated that the nanostructures derived from Pd octahedra displayed the highest ORR activity, being 1.7 times more active based on equivalent Pt mass than the commercial Pt/C. I also conducted a mechanistic study on the galvanic replacement reaction between AuCl4- and Pd nanorods. Differently from the Pd-Pt system, a new type of hybrid nanostructure in the tadpole shape consisting of a Au head and a Pd tail was obtained due to a localized galvanic replacement mechanism. As an extension of my work to develop new electrocatalysts for the ORR, a template-engaged reaction was utilized for the synthesis of RuSe2+[delta] nanotubes. The RuSe2+[delta] nanotubes were active towards the ORR and displayed no loss in activity in the presence of methanol, as opposed to commercial Pt/C. Finally, the template-engaged reaction was applied to the synthesis of Se@MSe (M = Zn, Cd or Pb) colloidal spheres having similar sizes but different compositions. They were utilized as building blocks to obtain 3D photonic crystals via self-assembly. Moreover, superparagametic properties could be obtained via the incorporation of Fe3O4 nanoparticles into the a-Se cores. Taken together, this represents a versatile approach to the synthesis of magnetoactive spheres with similar dimensions but a variety of compositions and properties.
Download or read book Modern Raman Spectroscopy written by Ewen Smith and published by John Wiley & Sons. This book was released on 2013-03-15 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reflects the dramatic increase in the number of Raman spectrometers being sold to and used by non-expert practitioners. It contains coverage of Resonance Raman and SERS, two hot areas of Raman, in a form suitable for the non-expert. Builds Raman theory up in stages without overloading the reader with complex theory Includes two chapters on instrumentation and interpretation that shows how Raman spectra can be obtained and interpreted Explains the potential of using Raman spectroscopy in a wide variety of applications Includes detailed, but concise information and worked examples
Download or read book Ultrasensitive Surface Enhanced Raman Scattering Nanomotors written by Xiaobin Xu (Ph. D.) and published by . This book was released on 2014 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Localized surface plasmon resonance resulting from the concerted oscillations of conduction-band electrons in noble-metal (Au, Ag) nanostructures greatly induces enhanced electric ([italic E]) fields in confined nanoscale locations, such as on the tips of nanorods or in the junctions of nanodimers. These [italic E]-field enhanced locations are called hot spots. In the vicinity of hot spots, Raman scattering spectra of biochemicals can be substantially amplified with an [italic E]4 dependence due to the [italic E]-field enhancement of both the incident light and Raman spectra. This is called surface enhanced Raman scattering (SERS). SERS is known for its high sensitivity in providing fingerprint vibrational information of molecules. It has triggered intense interest because of its potential applications for label-free and multiplex biochemical detection relevant to medical, environmental and defense purposes. However, the tremendous potential of SERS for ultrasensitive detection has still not materialized because of four major obstacles: (1) it is extremely difficult to obtain a large number of hotspots for sensitive and reproducible detection due to the stringent requirement of hot spots of only a few nanometers; (2) it is arduous to achieve ultrasensitivity for the detection of a single/few molecules; (3) it is challenging to assemble the hot-spots at designated positions for location predicable sensing; and (4) it is even more difficult to change the state-of-the-art static/passive sensing schemes into dynamic/robotized schemes and also to incorporate multi-functionality into a single SERS nanostructure. In this research, we addressed the aforementioned problems by rational design, fabrication and robotization of ultrasensitive SERS nanomotor sensors. A nanomotor sensor consists of a tri-layer structure with a three-segment Ag/Ni/Ag nanorod as the core, a thin layer of silica in the center, and uniformly distributed Ag nanoparticles as the outer layer. The inner metallic nanorod core is the key structure in realizing the concept of the robotization of nanosensors, which can be electrically polarized and thus efficiently manipulated by electric tweezers. The presence of the Ni segment in the metallic nanowire core also allows manipulation and assembling by magnetic interactions. The central silica layer provides a supporting substrate for the synthesis of the Ag nanoparticles and separates the Ag nanoparticles from the metallic nanorod core to eliminate the effect of plasmonic quenching. Finally, the outermost layer made of Ag nanoparticles with optimized sizes and junctions provides a large number of hot spots (~1200/ [mu] m2) for ultrasensitive SERS detection with single molecule sensitivity and an enhancement factor (EF) of 1.1×1010. Moreover, two additional SERS enhancement mechanisms were investigated, i.e., the optical management with nanophotonic devices and the near field effect, which can readily increase the EF by 10 and 2 times, respectively, to at least 1011. Finally, three applications of the SERS nanomotor sensors have been demonstrated: (1) the ultrasensitive SERS nanomotors were transported and assembled into a 3×3 array for location predicable sensing of multiplex molecules; (2) ultrasensitive SERS nanomotors were transported to individual living cells amidst many cells for single-cell bioanalysis; and (3) the SERS nanomotor sensors can be controlled to rotate by the electric tweezers for tunable biochemical release and detection. This research, exploring robotized nanosensors by integrating SERS and NEMS, is innovative in both material design and device concept, which could inspire a new device scheme for various bio-relevant applications.
Download or read book Raman Spectroscopy and Applications written by Khan Maaz and published by BoD – Books on Demand. This book was released on 2017-02-15 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Raman spectroscopy has a number of applications in various fields including material science, physics, chemistry, biology, geology, and medicine. This book illustrates necessary insight and guidance in the field of Raman spectroscopy with detailed figures and explanations. This presents deep understanding of new techniques from basic introduction to the advance level for scientists and engineers. The chapters cover all major aspects of Raman spectroscopy and its application in material characterization with special emphasis on both the theoretical and experimental aspects. This book is aimed to provide solid foundation of Raman spectroscopy to the students, scientists, and engineers working in various fields as mentioned above.
