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| Author | : 陳立妙 |
| Publisher | : |
| Total Pages | : 290 |
| Release | : 2011 |
| Genre | : Nanostructured materials |
| ISBN | : |
| Author | : Zhong-Qun Tian |
| Publisher | : John Wiley & Sons Incorporated |
| Total Pages | : 400 |
| Release | : 2010-06-14 |
| Genre | : Science |
| ISBN | : 9780470068083 |
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.
| Author | : Cosmin Farcau |
| Publisher | : GRIN Verlag |
| Total Pages | : 154 |
| Release | : 2015-03-03 |
| Genre | : Science |
| ISBN | : 3656911215 |
Doctoral Thesis / Dissertation from the year 2008 in the subject Physics - Optics, Babeș-Bolyai Universit, language: English, abstract: Ordered plasmonic nanostructures are currently the subject of numerous scientific studies, due to their potential applications, from optical communications to chemical analyses and biomedicine. This thesis is focused on a special type of periodically ordered two-dimensional (2D) metallo-dielectric structure, noble metal films over microsphere arrays: from their fabrication and characterization, to spectroscopic applications. Prepared structures exhibit remarkable optical properties (including an unusually high transmittance, resembling the extraordinary optical transmission phenomenon), resulting from the excitation of surface plasmons. It is demonstrated that these plasmo-photonic structures are very promising multifunctional active-substrates for Surface Enhanced Raman Scattering, Metal Enhanced Fluorescence, and Surface Plasmon Resonance Spectroscopy. Chapter 1 is devoted to giving an overview of the interesting aspects related to the optical properties and applications of periodically structured metals and dielectrics. We also briefly describe some of the currently developed nanofabrication techniques. A few concepts, like the photonic band and surface plasmon are introduced, being useful for the discussions in the upcoming chapters. We pay a special attention to colloidal photonic crystal films and noble metal structures obtained by templating on two-dimensional colloidal crystals. Chapter 2 presents own experimental results concerning the preparation, characterization and lithographic applications of two-dimensional (2D) colloidal crystal films. Results of the optical properties investigations are presented in Chapter 3, and divided in two main categories: i) photonic properties of bare microsphere arrays, and ii) plasmonic properties of noble metal nanostructured films deposited over microsphere arrays. In Chapter 4 we explore the capabilities of noble metal coated microsphere arrays to improve the sensitivity of optical spectroscopic methods: Surface Enhanced Raman Scattering, Metal Enhanced Fluorescence, and Surface Plasmon Resonance Spectroscopy.
| Author | : Claire Margaret Cobley |
| Publisher | : |
| Total Pages | : 154 |
| Release | : 2010 |
| Genre | : Electronic dissertations |
| ISBN | : |
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.
| Author | : Matthew Rycenga |
| Publisher | : |
| Total Pages | : 160 |
| Release | : 2011 |
| Genre | : Electronic dissertations |
| ISBN | : |
This research investigated the surface-enhanced Raman scattering (SERS) from Ag and Au nanoparticles with an aim to better understand the SERS mechanism and to implement this technique for single-molecule detection and imaging. In addition, SERS was used as a sensitive probe to study molecules confined to a nanoparticle's surface. The first part of this work focused on measuring the SERS from different Ag and Au nanoparticles and determining how their structural and physical properties affect SERS. The effects of shape, size, and Au-Ag composition on SERS are determined using Ag nanocubes, Ag nanospheres, and Au-based nanocages. I also demonstrate several techniques used to study the SERS of single nanoparticles, one at a time, which has provided significant insight into the SERS effect. I then discuss the development of a new and simple way to create large SERS enhancements by taking advantage of the supporting substrate of a nanoparticle. In this technique, simply depositing a single Ag nanocube on a metal substrate can increase its SERS enhancements to levels capable of single-molecule detection. In the second part of this work I used SERS as a molecular probe to understand how glucose molecules interact at a nanocube's surface, and as an optical thermometer to quantify the temperature change at the surface of a Au-based nanocage during the photothermal effect. The nanoparticles were coated with highly ordered self-assembled monolayers (SAMs), and then SERS was used to determine the structural and conformational changes in the SAMs as a result of perturbations from the environment. This allowed me to use SERS to directly probe the molecules on the nanoparticle's surface. In the final part of this work, I used nanocubes and nanospheres in SERS imaging. The resolution, sensitivity, and penetration depth are determined for our Raman microprobe system. In addition, phantoms are used to generate SERS images of three-dimensional microstructures.
| Author | : Swapna S. Nair |
| Publisher | : Springer Nature |
| Total Pages | : 121 |
| Release | : 2021-09-15 |
| Genre | : Science |
| ISBN | : 9811653674 |
This book highlights the synthesis/fabrication of novel materials for different kinds of optical applications. It covers all aspects of optical applications starting from LED/Lasers, SERS, bio-sensing, bio-imaging and non-linear optical applications such as optical limiting, saturable absorbers etc. The book describes the development of novel materials and geometry as well as engineering of their size and shape for harvesting better optical properties. Nonconventional plasmonic materials and their fabrication are discussed apart from the conventionally employed noble metal based nanosystems. In addition, development of Novel materials/structures for biosensing /bioimaging /optical limiting are also covered.
| Author | : |
| Publisher | : |
| Total Pages | : 148 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
The analytical capabilities of surface-enhanced Raman spectroscopy (SERS) reside in the performance characteristics of the SERS-active substrate. Signal enhancement observed in SERS is attributable to the presence of noble metal nanostructures on substrate surfaces. The rational design and control of variables such as shape and size, and distribution, density, and spacing of these nanostructures can lead to substrates that have greater analytical sensitivity and yield more reproducible enhancement. Through systematic control of the morphology of our SERS substrates, we have created ordered periodic arrays as well as random aggregates of nanoscale particles using electron beam lithography (EBL). A unique aspect of these EBL-created substrates is that the morphology is known with great precision. Once fabricated, the arrays and/or aggregates are coated with a SERS-active noble metal through physical vapor deposition (PVD). Both the uniform and random lithographically produced nanopatterns are studied by surface enhanced Raman spectroscopy to examine the Stokes responses of various analytes, while scanning electron microscopy (SEM) is used to examine pattern surfaces post lithographic development and post noble metal deposition. In the case of the ordered structures, raw and normalized SERS data is seen to correlate with data from simple electrostatic calculations as well as the broad background continuum underlying each spectrum collected. Borrowing from the biological concepts of cloning and combinatorial chemistry, random morphology patterns are designed and spectrally mapped to locate "hot spots" within aggregates. Regardless of the type of substrate, ordered or random, by using EBL, the substrates can be reproducibly fabricated, yielding consistent analyte environments each time the substrate is created.
| Author | : Mohindar Seehra |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 432 |
| Release | : 2018-07-04 |
| Genre | : Technology & Engineering |
| ISBN | : 1789232929 |
The use of copper, silver, gold and platinum in jewelry as a measure of wealth is well known. This book contains 19 chapters written by international authors on other uses and applications of noble and precious metals (copper, silver, gold, platinum, palladium, iridium, osmium, rhodium, ruthenium, and rhenium). The topics covered include surface-enhanced Raman scattering, quantum dots, synthesis and properties of nanostructures, and its applications in the diverse fields such as high-tech engineering, nanotechnology, catalysis, and biomedical applications. The basis for these applications is their high-free electron concentrations combined with high-temperature stability and corrosion resistance and methods developed for synthesizing nanostructures. Recent developments in all these areas with up-to-date references are emphasized.
| Author | : Tammy Y. Olson |
| Publisher | : |
| Total Pages | : 352 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
| Author | : Satyabrata Mohapatra |
| Publisher | : Elsevier |
| Total Pages | : 674 |
| Release | : 2018-10-11 |
| Genre | : Technology & Engineering |
| ISBN | : 0128141352 |
Noble Metal-Metal Oxide Hybrid Nanoparticles: Fundamentals and Applications sets out concepts and emerging applications of hybrid nanoparticles in biomedicine, antibacterial, energy storage and electronics. The hybridization of noble metals (Gold, Silver, Palladium and Platinum) with metal-oxide nanoparticles exhibits superior features when compared to individual nanoparticles. In some cases, metal oxides act as semiconductors, such as nano zinc oxide or titanium oxide nanoparticles, where their hybridization with silver nanoparticles, enhanced significantly their photocatalytic efficiency. The book highlights how such nanomaterials are used for practical applications. Examines the properties of metal-metal oxide hybrid nanoparticles that make them so adaptable Explores the mechanisms by which nanoparticles interact with each other, showing how these can be exploited for practical applications Shows how metal oxide hybrid nanomaterials are used in a range of industry sectors, including energy, the environment and healthcare
