Characterization and Control of the Nonlinear Optical Properties of Dendritic Silver Nanoparticle Clusters PDF Download
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Author: Jess M. Gunn
Publisher:
ISBN: 9781124678719
Category : Dielectric films
Languages : en
Pages : 123
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Book Description
Author: Jess M. Gunn
Publisher:
ISBN: 9781124678719
Category : Dielectric films
Languages : en
Pages : 123
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Book Description
Author: Rodolphe Antoine
Publisher: Springer
ISBN: 3319647431
Category : Technology & Engineering
Languages : en
Pages : 89
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Book Description
Metallic quantum clusters belonging to intermediate size regime between two and few hundred of atoms, represent unique building blocks of new materials. Nonlinear optical (NLO) characteristics of liganded silver and gold quantum clusters reveal remarkable features which can be tuned by size, structure and composition. The two-photon absorption cross sections of liganded noble metal quantum clusters are several orders of magnitude larger than that of commercially-available dyes. Therefore, the fundamental photophysical understanding of those two-photon processes in liganded clusters with few metal atoms deserve special attention, in particularly in context of finding the mechanisms responsible for these properties. A broad range of state-of-the-art experimental methods to determine nonlinear optical properties (i.e. two-photon absorption, two-photon excited fluorescence and second harmonic generation) of quantum clusters are presented. The experimental setup and underlying physical concepts are described. Furthermore, the theoretical models and corresponding approaches are used allowing to explain the experimental observations and simultaneously offering the possibility to deduce the key factors necessary to design new classes of nanoclusters with large NLO properties. Additionally, selected studied cases of liganded silver and gold quantum clusters with focus on their NLO properties will be presented as promising candidates for applications in imaging techniques such as fluorescence microscopy or Second-Harmonic Generation microscopy.
Author: Anil Desireddy
Publisher:
ISBN:
Category :
Languages : en
Pages : 185
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Book Description
Nanoparticles are well known for their marked deviations from bulk behavior. Metal nanoparticles between 5-100 nm have received the most attention due to their ease of synthesis and characterization. Below 3 nm, however, the electronic and atomic structure of metal nanoparticles can become discretized, producing families of magic-number clusters and a new regime of molecular behavior. Synthesis of a family of silver magic-number clusters is important to better understand fundamental science, test the "superatom" theory, and better explain basic rules underlying the anomalous stability of clusters. Despite an enormous amount of scientific and economic activity, the fundamental nature of the plasmon remains a mystery. This is primarily due to the challenge of preparing a series of molecularly precise clusters over a size range from small clusters to colloidal nanoparticles, but is also due to the complex physical and chemical interactions between the metal core and surrounding media and their effects on optical properties. Here, we overcome these challenges by synthesizing and separating a family of silver magic-number clusters with glutathione, cysteine, and captopril as ligands. Also, some efforts were made during the synthesis to produce specific size silver glutathione magic-number clusters. Changes in the metal-to-ligand ratio, solvent composition, and reaction pH were studied and successfully produced fewer clusters from a family of clusters. Synthesized magic-number clusters were separated and purified with PAGE for further analysis. Silver clusters are sufficiently reactive to facilitate the study of the ambient temporal stability of magic-number metal clusters and to begin to understand their decay mechanisms. Here, the solution phase stability of a series of silver:glutathione (Ag:SG) clusters was studied as a function of size, pH and chemical environment. These results provide new mechanistic insights into the control of post-synthesis stability and chemical decay of magic-number metal clusters, which could be used to develop design principles for synthesizing specific cluster species. Silver nanoparticles are more reactive than analogous gold nanoparticles due to silver's susceptibility to oxidation. To date there is no synthetic protocol to make stable silver nanoparticles. This limited usage of silver nanoparticles in technological applications. Herein we report a simple synthetic protocol for producing ultrastable, single sized and pure M4Ag44(p-MBA)30 nanoparticles in grams scale with quantitative yields. The unique chemical stability and structural, electronic and optical properties of this cluster are understood using first-principles electronic structure theory based on an experimental single-crystal X-ray structure. The facile synthesis of large quantities of pure molecular product promises to make this class of materials widely available for further research and technology development.
Author: Audrey E. Welles
Publisher:
ISBN: 9781616686901
Category : Metal powder products
Languages : en
Pages : 0
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Book Description
Silver nanoparticles are nanoparticles of silver, of between 1 nm and 100 nm in size. While frequently described as being 'silver' some are composed of a large percentage of silver oxide due to their large ratio of surface to bulk silver atoms. This book explores the properties, characterisation and application of silver nanoparticles on topics such as low and high-order nonlinearities of silver nanoparticles; the synthesis, growth mechanisms and tuneable optical and catalytic properties of silver nanoparticles; laser-induced shape transformation of silver nanoparticles embedded in glass and others.
Author: Sven Eric Henrichs
Publisher:
ISBN:
Category :
Languages : en
Pages : 410
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Book Description
Author: Khan Maaz
Publisher:
ISBN: 1789234786
Category :
Languages : en
Pages : 290
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Book Description
Author: Andreas Trügler
Publisher: Springer
ISBN: 3319250744
Category : Science
Languages : en
Pages : 227
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Book Description
This book introduces the fascinating world of plasmonics and physics at the nanoscale, with a focus on simulations and the theoretical aspects of optics and nanotechnology. A research field with numerous applications, plasmonics bridges the gap between the micrometer length scale of light and the secrets of the nanoworld. This is achieved by binding light to charge density oscillations of metallic nanostructures, so-called surface plasmons, which allow electromagnetic radiation to be focussed down to spots as small as a few nanometers. The book is a snapshot of recent and ongoing research and at the same time outlines our present understanding of the optical properties of metallic nanoparticles, ranging from the tunability of plasmonic resonances to the ultrafast dynamics of light-matter interaction. Beginning with a gentle introduction that highlights the basics of plasmonic interactions and plasmon imaging, the author then presents a suitable theoretical framework for the description of metallic nanostructures. This model based on this framework is first solved analytically for simple systems, and subsequently through numerical simulations for more general cases where, for example, surface roughness, nonlinear and nonlocal effects or metamaterials are investigated.
Author: Raul Rangel-Rojo
Publisher:
ISBN:
Category : Science
Languages : en
Pages :
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Book Description
Linear and Nonlinear Optical Properties of Aligned Elongated Silver Nanoparticles Embedded in Silica.
Author: Andrey L. Stepanov
Publisher:
ISBN:
Category : Science
Languages : en
Pages :
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Book Description
Linear and Nonlinear Optical Properties of Silver Nanoparticles Synthesized in Dielectrics by Ion Implantation and Laser Annealing.
Author: David Pozo
Publisher: IntechOpen
ISBN: 9789533070285
Category : Science
Languages : en
Pages : 344
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Book Description
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.
