Download or read book New Ultrasensitive Bimetallic Substrates for Surface Enhanced Raman Scattering written by Mohammad Yehia Khaywah and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven by the interest in finding ultrasensitive sensors devices, reliable surface enhanced Raman scattering (SERS) based substrates are fabricated. Silver and gold nanoparticles are two of the best candidates for SERS substrates where Ag nanoparticles exhibit large enhancing ability in Raman intensity while Au nanostructures are stable in biological systems. Hence, combining the two metals in bimetallic nanostructures appeared to be a promising approach in order to sum the merits of Au surface properties and Ag enhancing ability. Thermal annealing of thin metallic films is used as a simple and relatively inexpensive technique to elaborate homogenous and reproducible Ag/Au bimetallic nanoparticles SERS substrates with high enhancing ability. The fabricated nanoparticles proved their enhancing stability even after one year of fabrication. Manipulating the composition of Ag/Au bimetallic NPs resulted in tuning the Localized Surface Plasmon Resonance (LSPR) over the whole visible spectrum, where the substrates are characterized with higher SERS enhancement when they exhibit LSPR closer to the Raman excitation wavelength. Additionally, bimetallic nanoparticles patterns with different size, composition and lattice constants have been conducted by electron beam lithography. The systematic study of their interesting plasmonic and SERS enhancing properties revealed maintenance in the LSPR-SERS relation by changing the nanoparticle size.
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 Determining the Electronic Properties of Surface Enhanced Raman Spectroscopy Substrates written by Liam David Whelan and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Enhanced Raman Spectroscopy (SERS) is an ultra-sensitive technique for optical detection of target analytes. Our work focuses on detecting oil in water using SERS, with this thesis using phenanthrene as a model compound. SERS is a technique which takes advantage of the optical properties of metal substrates to greatly increase the intensities of adsorbed analytes' vibrational modes. The rapid development of novel materials as SERS active substrates requires an efficient screening method. SERS Enhancement Factor (EF) does correlate somewhat with surface morphology and UV-Vis absorption, however we present a technique which shows an even stronger correlation and is ultimately a better screening tool: Kelvin Probe Force Microscopy (KPFM). This technique maps the electronic properties of a substrate to its surface morphology. This thesis covers two classes of SERS substrates: annealed bimetallic systems and nanosphere patterned mono- and bimetallic systems. The ability to directly map the electronic properties of a substrate to its morphological properties is of critical importance in determining a key link between the macroscale SERS sensor response and the microscale substrate structure. Our major findings indicate that when Au/Cr nanostructured films' work function is near the calculated and experimental values for the HOMO-LUMO gap of the target analyte, phenanthrene, the observed SERS intensity reaches a maximum.
Download or read book Silver Dendrite Based Three dimensional Surface Enhanced Raman Scattering SERS Substrates written by Sandesh Rajkumar Shelke and published by . This book was released on 2016 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional (3D) hierarchical nanostructures have been considered as one of the most promising surface-enhanced Raman spectroscopy (SERS) substrates because it provides high-density hotspots along the three-dimension directions and high surface areas. In this thesis, we report the synthesis process to develop 3D SERS substrates in thin wall quartz capillary tube on Cu wire. These 3D SERS substrates consist of Ag dendrite, Au-Ag and Pd-Ag bimetallic nanostructures which was synthesized by employing simple galvanic replacement reactions (GRR). In this synthesis process Cu wire which is used as substrate was inserted in the thin walled quartz capillary tube and then AgNO3 was injected into the tube to form Ag dendrite on the Cu wire substrate. This pre-prepared dendrite was used to prepare bimetallic nanostructures of Au-Ag and Pd-Ag by injecting chlorauric acid (HAuCl4) and palladium chloride (PdCl4) into the tube, respectively. The GRR process leads to the replacement of Ag atoms by Au and Pd which causes corresponding morphological change of the underlying Ag dendrite. The GRR leaves pores where Ag is depleted. The morphological and compositional changes caused by GRR was analyzed by using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Two close metallic surfaces can enhance the electromagnetic (EM) field around molecules absorbed between them, which leads to extremely high SERS enhancement. These 3D SERS substrates was tested in detection of aqueous 4-Mercaptobenzoic Acid (4-MBA) solution with various concentrations. The fabricated substrate was employed to detect the 4-MBA solution to the detection limit down to 10-13 M and exhibits highenhanced performance. The results indicated that these 3D unique bimetallic nanostructures can amplify Raman signals for extremely low concentration molecules as compared to the Ag dendrite nanostructure substrates.
Download or read book Application of Novel Plasmonic Nanomaterials on SERS written by Grégory Barbillon and published by MDPI. This book was released on 2020-12-04 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) is a research technique that was discovered in the mid-1970s. SERS is a powerful and fast tool for analysis, which has a high detection sensitivity for a great number of chemical and biological molecules. However, it is in this last decade that a very significant explosion of the fabrication of highly sensitive SERS substrates has occurred using novel designs of plasmonic nanostructures and novel fabrication techniques of the latter, as well as new plasmonic materials and hybrid nanomaterials. Thus, this Special Issue is dedicated to reporting on the latest advances in novel plasmonic nanomaterials that are applied to the SERS domain. These developments are illustrated through several articles and reviews written by researchers in this field from around the world.
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:
Download or read book Principles and Clinical Diagnostic Applications of Surface Enhanced Raman Spectroscopy written by Yuling Wang and published by Elsevier. This book was released on 2021-09-17 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles and Clinical Diagnostic Applications of Surface-Enhanced Raman Spectroscopy summarizes the principles of surface-enhanced Raman scattering/spectroscopy (SERS) and plasmonic nanomaterials for SERS, with a focus on SERS applications in clinical diagnostics. This book covers the key concepts from the fundamentals, materials, experimental aspects, and applications of SERS in clinical diagnostics with discussions on label-free/direct SERS assay, design and synthesis of SERS nanotags, SERS nanotags for point-of-care diagnostics, microfluidic SERS assay, and in vitro and in vivo sensing and imaging. Written by experts from around the world, this comprehensive volume showcases the recent progress of SERS applications in clinical diagnostics and helps readers understand when and how to use SERS in a clinical setting. Introduces the basics of SERS and suitable nanomaterials for SERS application Gives an overview of the cutting-edge research on SERS applications for clinical diagnosis, including the latest advances in our understanding of underlying principles to enable material design and clinical applications Gradually builds from the fundamental concepts to the applications of SERS for clinical diagnostics
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 Substrates for Surface enhanced Raman Spectroscopy written by Muḥammad Ajmal K̲h̲ān and published by . This book was released on 2008 with total page 730 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 . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fostered by the remarkable progress in the fabrication of nanoparticles and nanostructures, in the last years Surface-Enhanced Raman scattering (SERS) has reached an impressive diffusion in many fields of chemistry and analytical sciences. Several exciting results have been recently reported in SERS-based ultrasensitive detection and molecular imaging. However, more than forty years after its discovery, conventional SERS is still struggling to make its way as a reliable analytical method. The remarkable enhancement of the local electromagnetic field achieved by plasmonic nanostructures is indeed a double-edged sword, as in pushing the sensitivity to the ultimate level, it strongly limits accuracy and reproducibility of the Raman data. In this context, non-plasmonic or hybrid plasmon/dielectric systems are emerging as a promising alternative/complement to conventional SERS. Core/shell systems like T-rex or SHiNERS are only a few examples of these novel SERS-active platforms. In parallel, new theoretical models, based on quantum optomechanical approaches have been recently proposed and developed for describing and predicting plasmonic, non-plasmonic and hybrid (e.g. photo-induced enhanced Raman scattering, PIERS) SERS, also including opto-thermal effects. Moreover, the next-generation of SERS-active materials is facing new challenges in terms of detection strategies, integration with complementary methods and stimuli responsiveness. This Research Topic collects the most recent advances in SERS and related effects, from the viewpoint of theory/models, materials and detection strategies, providing an up-to-date forum for setting the basis for future research in this vibrant field.
Download or read book New Surface enhanced Raman Spectroscopy Substrates written by John Patrick Neddersen and published by . This book was released on 1994 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ag Nano dendritic Three dimensional 3D Surface enhanced Raman Scattering SERS Substrate for In situ Liquid Media Detection written by Milind Mansing Pawar and published by . This book was released on 2019 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuous monitoring of certain environmental pollutants, biological species, chemical species, and explosives are of utmost importance in recent times. Surface-enhanced Raman scattering (SERS) provides most promising option as it is a highly sensitive technique which allows for ultrasensitive detection of molecules and provides excellent structural information. To obtain rich results through Surface-enhanced Raman scattering, proper design of enhancing substrate plays vital role. Contemporary SERS substrates don't provide ease to detect liquid analytes for in-situ spectroscopy. Liquid media detection through SERS relies on highly statistical binding of analytes to SERS-sensitive hot spots. Moreover, it becomes extremely difficult to detect flowing liquid media in-situ with two dimensional substrates as very small volume of Liquid contact with substrates. Single crystal Ag dendrite structures possess high surface area along with narrow gaps and sharp edges. Compared with other nanostructures, the hierarchical nanostructures-dendritic Ag, consisting of multi-level branches can significantly promote the SERS enhancement and serve as effective SERS substrates with high sensitivity and reproducibility. Such complex nanostructures may provide a large amount of "hot spots" at the end of branches or the junctions of adjacent Ag branches. In addition, the large surface area of Ag dendrites can enhance the interaction between analytes and sensing substrates. Ag dendrites can easily be produced, by use of one of the simplest galvanic reactions, the reaction of AgNO3 with Cu. We have developed novel yet simple Surface-enhanced Raman scattering- active substrate having three-dimensional array of Ag-dendrites grown within square geometry capillary tube of borosilicate glass via such galvanic replacement reaction with inserted copper wire. Systematic study of growth mechanism of Ag-dendrites was carried out and complex nature of seemingly "simple" galvanic replacement reaction has been proposed. The resultant Ag dendrites were characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Atime-dependent investigation on the growth mechanism of the Ag dendrites revealed that they develop through a particle-mediated growth process. The effect of the reactant concentrations on the morphology of the synthesized Ag dendrites was also studied. This study on Ag dendrite growth mechanisms are not only scientifically intriguing, but also technologically important. Novel Ag dendrite three-dimensional SERS substrate exhibits excellent sensitivity and a very good reproducibility. We have detected rhodamine 6G(R6G) with lowest concentration of 10-11 M in aqueous solution. These Ag dendrite nanostructured three-dimensional SERS substrates are proved as excellent in-situ liquid media Raman detection substrates due to availability of extensive hot spots. It has significant potential to be used as SERS substrates for fast and accurate detection of trace amount of organic contaminants in flowing liquid media.
Download or read book Surface Enhanced Raman Scattering SERS Substrates and Probes written by Srismrita Basu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A new nanostructured substrate for surface enhanced Raman spectroscopy written by Suzanne Pelfrey and published by . This book was released on 2004 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Surface Enhanced Raman Scattering Substrate for Sensitive Detection of Aqueous Contaminants written by Md. Shah Alam and published by . This book was released on 2018 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plastic Substrates for Surface enhanced Raman Scattering written by Matthias Geissler and published by . This book was released on 2009 with total page 32 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.
