Download or read book Embedded Silver Nanoparticles for Metal Enhanced Photoluminescence written by Shahid Iqbal (Ph. D.) and published by . This book was released on 2019 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imaging of biologically significant molecules using plasmons of Metal Nanoparticles (MNPs) is gaining attention in the research community. Localized Surface Plasmon Resonance (LSPR) is the coherent oscillation of conduction electrons of MNPs. The biologically significant molecule is labeled with the fluorophore molecule to get the image. This approach is widely used in clinical practices, however, low intensity light emission from the labeled molecule makes it difficult to image the biologically significant material. One way to improve the weak intensities of fluorophore is to enhance the brightness using a process called Metal Enhanced Photoluminescence (MEP). This phenomenon occurs in the close vicinity of MNPs. Most of the studies in this regard have been carried out using chemically synthesized MNPs of different crystallinity, sizes and shapes. One problem with this approach is the possibility of direct chemical interaction between the fluorophore and MNPs that results in quenching of the Photoluminescence (PL) intensity. In this dissertation we adopted the approach to enhance the PL of different fluorophore molecules/materials by exploiting the LSPR of embedded noble MNPs. Noble MNPs (Au, Ag, Cu) are widely used because the LSPR resonant frequency falls in the visible region of the electromagnetic spectrum that closely overlaps with the excitation frequency of the fluorophore that are used for biological imaging. We tested our approach using Coumarin (C 515) dye and lead halide perovskites, CsPbX3 (X = Cl, Br, and I) and successfully enhanced PL intensity. Moreover, lead halide perovskites have several optoelectronics applications that make them fluorophore of interest. In this dissertation, embedded Silver Nanoparticles (Ag NPs) were synthesized via low energy ion implantation within a few nanometers below the surface of quartz substrates. Ion implantation was carried out with different ion beam fluences and 70 keV ion beam energy. Rutherford Backscattering Spectrometry (RBS) measurements were used to obtain the depth profile and concentration of silver within the quartz substrate. The formation of Ag NPs is characterized by UV/Visible spectroscopy measurements. LSPR peaks of Ag NPs were observed with respect to different fluences that confirmed the formation of embedded Ag NPs. An increase in the size distribution of Ag NPs was observed as the fluence of Ag within the substrate increased. Size increase of Ag NPs was confirmed by the broadening as well as the red-shift of LSPR peaks. Steady-state excitation and emission measurements of C 515, CsPbI3, CsPbBrI2, and CsPbBr3 were carried out to see the effect of embedded Ag NPs on the PL properties of fluorophores. An increase in the PL intensity of C 515, CsPbI3, and CsPbBrI2 was observed with the increase in fluences, giving maxima of 2.1, 3.6, and 5.9 times the PL intensity enhancement. The observed PL enhancement was attributed to a combination of plasmon enhancement with larger Ag NPs and increased plasmonic hot spots. In addition, PL quenching was also observed in case of the CsPbBr3 perovskite nanocomposites with the quenching corresponding to the non-radiative energy transfer from CsPbBr3 perovskite to silver nanoparticles.

Download or read book Metal Enhanced Fluorescence written by Chris D. Geddes and published by John Wiley & Sons. This book was released on 2010-06-22 with total page 655 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover how metal-enhanced fluorescence is changing traditional concepts of fluorescence This book collects and analyzes all the current trends, opinions, and emerging hot topics in the field of metal-enhanced fluorescence (MEF). Readers learn how this emerging technology enhances the utility of current fluorescence-based approaches. For example, MEF can be used to better detect and track specific molecules that may be present in very low quantities in either clinical samples or biological systems. Author Chris Geddes, a noted pioneer in the field, not only explains the fundamentals of metal-enhanced fluorescence, but also the significance of all the most recent findings and models in the field. Metal-enhanced fluorescence refers to the use of metal colloids and nanoscale metallic particles in fluorescence systems. It offers researchers the opportunity to modify the basic properties of fluorophores in both near- and far-field fluorescence formats. Benefits of metal-enhanced fluorescence compared to traditional fluorescence include: Increased efficiency of fluorescence emission Increased detection sensitivity Protect against fluorophore photobleaching Applicability to almost any molecule, including both intrinsic and extrinsic chromophores Following a discussion of the principles and fundamentals, the author examines the process and applications of metal-enhanced fluorescence. Throughout the book, references lead to the primary literature, facilitating in-depth investigations into particular topics. Guiding readers from the basics to state-of-the-technology applications, this book is recommended for all chemists, physicists, and biomedical engineers working in the field of fluorescence.

Download or read book Influence of Silver Nanoparticles on Fluorescence Enhancement written by Sai Bharanisrikanth Toleti and published by . This book was released on 2016 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, we studied the influence of silver nanoparticles (AgNP) on the fluorescence properties over glass substrates and on Nano pours oxide film substrates. Enhanced fluorescence intensities were observed due to presence of AgNP in near field to a fluorophore creating hot spots thereby proving the concepts of Metal Enhanced Fluorescence and Surface Plasmon Resonance (SPR). A Bragg reflector pattern is created by varying the refractive index of surface resulting in layered structure causing the light getting trapped in between the layers which exhibited the properties of SPR and Evanescent fields. The mean intensity values were higher for the AgNP introduced glass samples compared to the controls, which provided an evidence of Fluorescence Enhancement. This property may be useful for designing new analytical tools that can be used for single molecule detection in the fields of bio sensing and bio imaging.

Download or read book Surface Plasmon Enhanced Photoluminescence of the Rubrene Film by Silver Nanoparticles written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Glass Nanocomposites written by Basudeb Karmakar and published by William Andrew. This book was released on 2016-01-19 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass Nanocomposites: Synthesis, Properties and Applications provides the latest information on a rapidly growing field of specialized materials, bringing light to new research findings that include a growing number of technologies and applications. With this growth, a new need for deep understanding of the synthesis methods, composite structure, processing and application of glass nanocomposites has emerged. In the book, world renowned experts in the field, Professors Karmakar, Rademann, and Stepanov, fill the knowledge gap, building a bridge between the areas of nanoscience, photonics, and glass technology. The book covers the fundamentals, synthesis, processing, material properties, structure property correlation, interpretation thereof, characterization, and a wide range of applications of glass nanocomposites in many different devices and branches of technology. Recent developments and future directions of all types of glass nanocomposites, such as metal-glasses (e.g., metal nanowire composites, nanoglass-mesoporous silica composites), semiconductor-glass and ceramic-glass nanocomposites, as well as oxide and non-oxide glasses, are also covered in great depth. Each chapter is logically structured in order to increase coherence, with each including question sets as exercises for a deeper understanding of the text. - Provides comprehensive and up-to-date knowledge and literature review for both the oxide and non-oxide glass nanocomposites (i.e., practically all types of glass nanocomposites) - Reviews a wide range of synthesis types, properties, characterization, and applications of diverse types of glass nanocomposites - Presents future directions of glass nanocomposites for researchers and engineers, as well as question sets for use in university courses

Download or read book Metal Nanostructures for Photonics written by Luciana Reyes Pires Kassab and published by Elsevier. This book was released on 2018-08-21 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Nanostructures for Photonics presents updates on the development of materials with enhanced optical properties and the demand for novel metal-dielectric nanocomposites and nanostructured materials. The book covers various aspects of metal-dielectric nanocomposites and metallic-nanostructures and illustrates techniques used to prepare and characterize materials and their physical properties. It focuses on three main sections, nanocomposites with enhanced luminescence properties due to contributions of metal nanoparticles hosted in photonic glasses, near and far-field optical phenomena, and the optical response of single nanoparticles that reveal quantum phenomena in the nanoscale, amongst other topics. This book will serve as an important research reference for materials scientists who want to learn more on how a range of metallic nanostructured materials are used in photonics. - Sets out the properties of a range of metal-dielectric nanostructures and nanocomposites, along with the use cases for each in photonics - Discusses the pros and cons of using different metallic nanostructures for different photonic applications - Includes case studies that illustrate how metallic nanostructures have successfully been applied in photonics

Download or read book Nanogap Embedded Silver Gratings for Surface Plasmon Enhanced Fluorescence written by Kunal Bhatnagar and published by . This book was released on 2012 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasmonic nanostructures have been extensively used in the past few decades for applications in sub-wavelength optics, data storage, optoelectronic circuits, microscopy and bio-photonics. The enhanced electric field produced within a few hundred nanometers of these surfaces can be used to excite fluorophores in the surrounding environment. Fluorescence based bio-detection and bio-imaging are two of the most important tools in the life sciences and improving the qualities and capabilities of fluorescence based detectors and imaging equipment remains a big challenge for industry manufacturers. We report a novel fabrication technique for producing nano-gap embedded periodic grating substrates on the nanoscale using a store bought HD-DVD and conventional soft lithography procedures. Polymethylsilsesquioxane (PMSSQ) polymer is used as the ink for the micro-contact printing process with PDMS stamps obtained from the inexpensive HD-DVDs as master molds. Fluorescence enhancement factors of up to 118 times were observed with these silver nanostructures in conjugation with Rhodamine-590 fluorescent dye. These substrates are ideal candidates for a robust and inexpensive optical system with applications such as low-level fluorescence based analyte detection, single molecule imaging, and surface enhanced Raman studies.

Download or read book Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide written by Sanjay K. Karna and published by . This book was released on 2016 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to the oxide bond with carbon i.e. defect in graphene structure. This is the uniqueness of the graphene-base material. Graphene is a gapless material i.e. having no bandgap energy and this property prevents it from switching device applications and also from the optoelectronic devices applications. The main challenge for this material is to tune as a semiconducting which can open the optical characteristics and emit light of desired color. There may be several possibilities for the modification of graphene-base material that can tune a band gap. One way is to find semiconducting property by doping the defects into pristine graphene structure. Other way is oxides functional groups in graphene structure behaves as defects. The physical properties of graphene depend on the amount of oxides present in graphene structure. So if there are more oxides in graphene structure then this material behaves as a insulating. By any means if it can be reduced then oxides amount to achieve specific proportion of sp2 and sp3 that can emit light of desired color. Further, after achieving light emission from graphene base material, there is more possibility for the study of non-linear optical property. In this work, plasmonic effect in graphene oxide has been focused. Mainly there are two kinds of plasmon effects have been studied, one is long range (surface) and short range (localized) plasmon. For long range plasmon gold thin film was deposited on partially reduced graphene oxide and for short range plasmon silver nanoparticles have used. Results show that there are 10-fold enhancement in light emission from partial graphene oxide coated with gold thin film while 4-fold enhancement from reduced graphene oxide solution with silver nanoparticles. Chemical method and photocatalytic method have been employed for the reduction of graphene oxide for the study of surface plasmon and localized plasmon. For the characterization UV-Vis spectrometer for absorption, spectrofluorophotometer for fluorescent emission, Raman spectrometer for material characterization, photoluminescence and time resolved photoluminescence have been utilized. Silver and gold nanoparticles are spherical of average size of 80 nm and 40 nm have been used as plasmons.

Download or read book Gold and Silver Nanoparticles written by Suban K. Sahoo and published by Elsevier. This book was released on 2023-01-20 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold and Silver Nanoparticles: Synthesis and Applications provides detailed information on the preparation and utilization of Au- and Ag-based nanoparticles in a range of novel areas. Gold and silver nanoparticles offer a range of interesting properties, including unique size-dependent optoelectronic properties, chemical stability and biocompatibility, ease of synthesis and surface modification, excellent resistance to corrosion, and catalytic properties, hence paving the way to a wide range of cutting-edge applications with continual advances and innovations. Sections introduce gold and silver nanoparticles, fundamental theory, synthesis, and characterization techniques before focusing on requirements and preparation methods. Specific applications areas, such as surface-enhanced Raman spectroscopy (SERS), sensing and biosensing, imaging, drug and gene delivery, disease diagnosis, catalysis, and optoelectronic device fabrication are covered. Finally, synthesis and applications of platinum- and palladium-based nanoparticles are discussed. This is a valuable resource for researchers and advanced students across nanoscience and nanotechnology, chemistry, and materials science, as well as scientists, engineers, and R&D professionals with an interest in noble metal nanomaterials for a range of industrial applications. - Explains theory, synthesis, characterization, and properties of Au- and Ag- based nanoparticles - Explores a range of novel applications across biomedicine, optoelectronics, and other areas - Analyzes the latest developments in the field and considers noble metal nanoparticles beyond gold and silver

Download or read book Silver Nanoparticles written by David Pozo and published by BoD – Books on Demand. This book was released on 2010-03-01 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology will be soon required in most engineering and science curricula. It cannot be questioned that cutting-edge applications based on nanoscience are having a considerable impact in nearly all fields of research, from basic to more problem-solving scientific enterprises. In this sense, books like “Silver Nanoparticles” aim at filling the gaps for comprehensive information to help both newcomers and experts, in a particular fast-growing area of research. Besides, one of the key features of this book is that it could serve both academia and industry. “Silver nanoparticles” is a collection of eighteen chapters written by experts in their respective fields. These reviews are representative of the current research areas within silver nanoparticle nanoscience and nanotechnology.

Download or read book Silver Nanoparticles Embedded in Diamond with Tunable Optical Properties written by Shuo Li and published by . This book was released on 2019 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we demonstrate a convenient method of incorporating plasmonic Ag metal nanoparticles into CVD diamond thin films, and a stable Ag-diamond hybrid structure can be made. The Ag sizes and diamond thicknesses can be controlled precisely, resulting in the tunable optical properties of diamond. In Chapter 2, we show that we grow a Diamond-Ag-Diamond laminate structure, where the Ag nanoparticles are uniformly embedded into the diamond layers, which increases the diamond optical absorption and enhances the photoelectron emission property and photocatalytic reduction of N2 to NH3 ability. In Chapter 3, we show that the Diamond-Ag-Diamond structure can be grown on transparent quartz substrates, and the optical absorption of the Diamond-Ag-Diamond can be measured directly; by tuning the Ag size and diamond thicknesses, the Diamond-Ag-Diamond exhibits tunable coloration. In Chapter 4, we show that a stable Ag-Diamond core-shell structure can be grown, and the Ag with plasmonic effect can interact with and enhance the SiV emission signals in the diamond. Overall, we developed a convenient method to fabricate a unique Ag-diamond structure with great stability, and is a promising platform with tunable optical properties in various applications, including enhanced performance of diamond as photocatalysts, photoelectron emitters, optical coatings and quantum emitters.

Download or read book Semiconductor Nanocrystals and Metal Nanoparticles written by Tupei Chen and published by CRC Press. This book was released on 2016-10-14 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanocrystals and metal nanoparticles are the building blocks of the next generation of electronic, optoelectronic, and photonic devices. Covering this rapidly developing and interdisciplinary field, the book examines in detail the physical properties and device applications of semiconductor nanocrystals and metal nanoparticles. It begins with a review of the synthesis and characterization of various semiconductor nanocrystals and metal nanoparticles and goes on to discuss in detail their optical, light emission, and electrical properties. It then illustrates some exciting applications of nanoelectronic devices (memristors and single-electron devices) and optoelectronic devices (UV detectors, quantum dot lasers, and solar cells), as well as other applications (gas sensors and metallic nanopastes for power electronics packaging). Focuses on a new class of materials that exhibit fascinating physical properties and have many exciting device applications. Presents an overview of synthesis strategies and characterization techniques for various semiconductor nanocrystal and metal nanoparticles. Examines in detail the optical/optoelectronic properties, light emission properties, and electrical properties of semiconductor nanocrystals and metal nanoparticles. Reviews applications in nanoelectronic devices, optoelectronic devices, and photonic devices.

Download or read book Silver Nanoparticles written by Khan Maaz and published by Intechopen. This book was released on 2018 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silver nanoparticles are the subject of immense interest because of their distinct chemical and physical properties that are different from their bulk counterpart. This makes these nanoparticles very important in many fields including antimicrobial applications, biosensor materials, composite fibers, cryogenic superconducting materials, cosmetic products, and electronic components. This book aims to provide in-depth study and analysis of various fabrication, characterization, and application techniques of silver nanoparticles that lead these nanoparticles very important in the recent technology. This book presents deep understanding of the new techniques from basic to the advanced level. This book addresses scientists, engineers, doctoral and postdoctoral fellows, and technical professionals working in specialized fields.

Download or read book Electrochemically Engineered Nanoporous Materials written by Dusan Losic and published by Springer. This book was released on 2015-07-18 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides in-depth knowledge about the fabrications, structures, properties and applications of three outstanding electrochemically engineered nanoporous materials including porous silicon, nanoporous alumina and nanotubular titania. The book integrates three major themes describing these materials. The first theme is on porous silicon reviewing the methods for preparation by electrochemical etching, properties and methods for surface functionalization relevant for biosensing applications. Biomedical applications of porous silicon are major focus, described in several chapters reviewing recent developments on bioanalysis, emerging capture probes and drug delivery. The second theme on nanoporous alumina starts with describing the concept of self-organized electrochemical process used for synthesis nanopore and nanotube structures of valve metal oxides and reviewing recent development and progress on this field. The following chapters are focused mainly on optical properties and biosensing application of nanoporous alumina providing the reader with the depth of understanding of the structure controlled optical and photonic properties and design of optical biosensing devices using different detection principles such as photoluminescence, surface plasmon resonance, reflective spectrometry, wave guiding, Raman scattering etc. The third theme is focused on nanotubular titania reviewing three key applications including photocatalysis, solar cells and drug delivery. The book represents an important resource for academics, researchers, industry professionals, post-graduate and high-level undergraduate students providing them with both an overview of the current state-of-the-art on these materials and their future developments.

Download or read book Radiative Decay Engineering written by Chris D. Geddes and published by Springer Science & Business Media. This book was released on 2007-12-11 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: During recent years our enthusiasm for this field has continually increased. This book presents expert contributions describing the fundamental principles for the widespread use of radiative decay engineering in the biological sciences and nanotechnology.

Download or read book Rare Earth written by Sooraj H. Nandyala and published by Materials Research Forum LLC. This book was released on 2024-06-05 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph represents a tribute to the late Prof. Karl Gschneidner, well known as “Mr. Rare Earth”, distinguished Professor of Materials Science and Engineering at the Iowa State University, a Senior Metallurgist at the Ames Laboratory, and the Chief Scientist of the Critical Materials Institute. Topics covered include Rare Earth Glass Spectroscopy, Treating Skin Diseases, Prospective Rare Earth Applications, Optical Information Storage, Diagnostic Imaging, Nanoparticles in Glasses, and ZnO Nanomaterials.

Download or read book Surface Plasmon Enhanced Coupled and Controlled Fluorescence written by Chris D. Geddes and published by John Wiley & Sons. This book was released on 2017-03-03 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explains the principles and current thinking behind plasmon enhanced Fluorescence Describes the current developments in Surface Plasmon Enhanced, Coupled and Controlled Fluorescence Details methods used to understand solar energy conversion, detect and quantify DNA more quickly and accurately, and enhance the timeliness and accuracy of digital immunoassays Contains contributions by the world’s leading scientists in the area of fluorescence and plasmonics Describes detailed experimental procedures for developing both surfaces and nanoparticles for applications in metal-enhanced fluorescence