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Author: Saraswathi Amma B
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838362670
Category :
Languages : en
Pages : 124
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Book Description
Semiconductor nanoparticles have drawn much attention due to their size dependent properties. Cadmium Sulphide (CdS), due to its large Bohr exciton diameter, has applications in various areas like optoelectronics, photo catalysis, biological assays, optical data storage and sensing. The optical properties of CdS nanoparticles capped with different capping agents, synthesized in aqueous and non-aqueous medium are presented in this monograph. As surface states have significant influence on the optical properties, surface passivation is important for improving Photoluminescence property apart from controlling the particle size. Stability and the optical properties of CdS - Polyvinyl Alcohol (PVA) nanocomposite films are dealt. The effects of electron irradiation and also, a Zinc Sulphide (ZnS) coating on the luminescence properties of CdS nanoparticles are also given. This monograph is specially targeted to researchers working in the field of semiconductor nanoparticles as well as postgraduate students of Physics, Chemistry, Electrical and Materials Engineering.
Author: Saraswathi Amma B
Publisher: LAP Lambert Academic Publishing
ISBN: 9783838362670
Category :
Languages : en
Pages : 124
Get Book Here
Book Description
Semiconductor nanoparticles have drawn much attention due to their size dependent properties. Cadmium Sulphide (CdS), due to its large Bohr exciton diameter, has applications in various areas like optoelectronics, photo catalysis, biological assays, optical data storage and sensing. The optical properties of CdS nanoparticles capped with different capping agents, synthesized in aqueous and non-aqueous medium are presented in this monograph. As surface states have significant influence on the optical properties, surface passivation is important for improving Photoluminescence property apart from controlling the particle size. Stability and the optical properties of CdS - Polyvinyl Alcohol (PVA) nanocomposite films are dealt. The effects of electron irradiation and also, a Zinc Sulphide (ZnS) coating on the luminescence properties of CdS nanoparticles are also given. This monograph is specially targeted to researchers working in the field of semiconductor nanoparticles as well as postgraduate students of Physics, Chemistry, Electrical and Materials Engineering.
Author: C.N.R. Rao
Publisher: Springer Science & Business Media
ISBN: 3540687521
Category : Technology & Engineering
Languages : en
Pages : 187
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Book Description
This is the most comprehensive book on nanocrystals on the market. It is an up-to-date monograph on an important aspect of nanoscience and technology. It opens with an elegant introduction including a brief historical account. Emphasis is then given to diverse synthetic methods, both chemical and physical, in addition to modern hybrid methods. Tables providing information at a glance, cartoons and schematic diagrams, make the monograph appealing to read.
Author: Stanislav I. Sadovnikov
Publisher: Springer
ISBN: 3319563874
Category : Technology & Engineering
Languages : en
Pages : 329
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Book Description
This book presents and analyzes the influence of small size particles of lead, cadmium and silver sulfide on the properties of nonstoichiometric semiconductors. Important nonstoichiometry aspects in nanostructures are discussed, such as the distribution of sulfur atoms in nanofilms, a non-periodic distribution of the atomic planes in nanoparticles, interdependent changes in crystal structure of nanocrystalline material. Tuning the stoichiometry allows to obtain superionic conductivity and catalytic activity under visible light. The wavelength of the luminescence of nanoparticles changes with the size of the nanoparticles. Various methods to prepare nanostructured sulfides are described. Special attention is given to the hydrochemical bath deposition as a universal method for the synthesis of sulfides as nanofilms, stable colloidal solutions, quantum dots, isolated nanoparticles with a protective shell and heteronanostructures. The effect of nanoparticle size and nonstoichiometry on the band gap, optical and thermal properties of nanostructured sulfides is also considered. The novel applications of sulfide nanoparticles in nanoelectronics, catalysis, nanobiology and nanomedicine are sketched.
Author: Sunipa Roy
Publisher: CRC Press
ISBN: 1351642820
Category : Technology & Engineering
Languages : en
Pages : 299
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Book Description
Nano particles have created a high interest in recent years by virtue of their unusual mechanical, electrical, optical and magnetic properties and find wide applications in all fields of engineering. This edited volume aims to present the latest trends and updates in nanogenerators, thin film solar cells and green synthesis of metallic nanoparticles with a focus on nanostructured semiconductor devices. Exclusive chapter on electrical transport of nanostructure explains device physics for material properties for reduced dimensions. Additionally, the text describes the functionality of metallic nanoparticles and their application in molecular imaging and optical metamaterials. Piezoelectric nanogenerators has been touched upon from the energy perspective as well. Key Features: • Organized contents on Nanogenerators, VOC sensing, nanoelectronics, and NEMS. • Discusses eco-friendly green synthesis methods for metallic nanoparticles. • Touches upon low power nano devices (e.g. nanogenerators) for energy harvesting with quantum mechanical study. • Thin film/heterojunction based high efficiency solar cell addressed aimed at reducing global energy consumption.
Author: Karen Lizbeth Flores Rodríguez
Publisher: Springer Nature
ISBN: 3030820645
Category : Technology & Engineering
Languages : en
Pages : 227
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Book Description
The book is a multidisciplinary space and serves as a platform to share and learn about the frontier knowledge between different areas related to “Recent trends in sustainable engineering.” Sustainable engineering promotes the responsible use of resources and materials involved in the different manufacturing processes or the execution stages of a service. An interdisciplinary approach is required in all aspects of engineering. In this sense, engineers, researchers, and the academic community will play a fundamental role in developing new technologies that respect the environment, still, at the same time, that considers social and economic factors.
Author: Marek Kosmulski
Publisher: CRC Press
ISBN: 142005189X
Category : Science
Languages : en
Pages : 1094
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Book Description
The Most Detailed Resource Available on Points of Zero ChargeWith their work growing in complexity, chemists involved with surface phenomena-related projects have outgrown the common resources available to them on points of zero charge (PZC) of oxides. Reporting on a limited number of materials in a limited number of scenarios, these resources ofte
Author: Johannes Frenzel
Publisher:
ISBN:
Category :
Languages : en
Pages : 123
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Book Description
Author: Jeyasingh Ebenezar
Publisher: Springer
ISBN: 3319448900
Category : Science
Languages : en
Pages : 731
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Book Description
This book gathers the proceedings of the plenary sessions, invited lectures, and papers presented at the International Conference on Recent Trends in Materials Science and Applications (ICRTMSA-2016). It also features revealing presentations on various aspects of Materials Science, such as nanomaterials, photonic crystal fibers, quantum dots, thin film techniques, crystal growth, spectroscopic procedures, fabrication and characterisation of new materials / compounds with enhanced features, and potential applications in nonlinear optical and electro-optic devices, solar cell device, chemical sensing, biomedical imaging, diagnosis and treatment of cancer, energy storage device etc. This book will be of great interest to beginning and seasoned researchers alike.
Author: Tharwat Mokalled Mokalled
Publisher:
ISBN:
Category :
Languages : en
Pages : 256
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Book Description
We present in the first chapter of this thesis an overview about the properties of cadmium sulfide (CdS) nanoparticles and their quantum size effects which renders them useful in various applications (light emitting diodes, photovoltaic devices, sensors, etc). Then we describe some of the methods for determining the size of these nanoparticles. This is followed by an overview of the synthetic techniques for the preparation of CdS quantum dots (aqueous and non aqueous), description of their nucleation and growth, and their photophysical properties. In chapter two, we discuss the behavior of CdS nanoparticles in gel (agar and gelatin) matrix in the presence of various capping agents in order to explore regimes of concentrations. From these observations, we introduce a new pulse-exhibiting reaction-diffusion system which consists of sulfide ions as an outer diffusing electrolyte into a gel containing mercaptoethanol-capped cadmium ions as an inner electrolyte, producing cadmium sulfide nanoparticles. These nanoparticles form a transparent faint yellow propagating front (connection between the bulk region and the nuclei region) which propagates starting from the junction between the two electrolytes; however, when subject to UV light, a very thin yellow fluorescing region appears leading this front region which is defined as the pulse (spatially localized region that propagates heading the a solitary wave). Ultraviolet/visible (UV/Vis) absorption and X-ray diffraction (XRD) measurements show that the average size of CdS nanoclusters in the front region is around 6-8 nm with a cubic phase, while UV/Vis measurements show that the average size of the CdS nanoparticles in the pulse region is about 4 nm. The distance travelled by the pulse versus time exhibits a diffusion-like profile, and it is found that the speed of the pulse propagation fluctuates as the concentration of the capping agent is varied. We observe that the width of the pulse remains constant with time (approximately 2 mm) and is independent of the outer electrolyte concentration (S0). This yellow fluorescence originates from emission from surface states as seen through the emission spectra of the pulse region. Time-correlated-single-photon counting (TCSPC) measurements are performed on both the pulse and the front regions in order to understand the origin of the weak fluorescence in the front region. In the third chapter of the thesis, the spatiotemporal dynamics of this pulse- propagating system is theoretically studied using a competitive particle growth model (Müller -Polezhaev (MP) model) wherein the evolution equations for the reactants and the product are written and solved, and the results are found to be in good agreement with the experimental findings. The densities of the small particles in the pulse region are found to lie within the density distribution of the larger particles in the front region which confirms the evolution of the pulse while leading the front. Moreover, the pulse has shown a diffusion-like profile of x peak equal to time power half, as was experimentally verified. A power law of the form xpeak equal to the initial concentration (S0) to the power 1/4 relates the distance travelled by the pulse (xpeak) to the concentration of the outer electrolyte (S0). Finally, the width of the pulse obeys a time power law, w equal to time power alpha, with crossover between an early time regime (alpha = 1/3) and an intermediate time regime (alpha = 0). Thus, this system provides a method to study the early dynamics of Liesegang systems.
Author: John F. Leatherland
Publisher: C A B International
ISBN: 9781845935535
Category : Medical
Languages : en
Pages : 403
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Book Description
Written by leading authorities in the field, this new edition of Volume 2 in the successful Fish Diseases and Disorders trilogy has been thoroughly updated with new research and contributions. Focusing largely on finfish, it covers non-infectious disorders of development, growth and physiology of wild and captive species, including genetic conditions, respiratory disorders, stress physiology and environmental factors. There is also a new contribution on the relationship between welfare issues and disorders associated with intensive fish culture. The book is indispensable for zoologists, fish health specialists and veterinarians, researchers and students, and those involved with fisheries and aquaculture. `The book is important for those involved in aquaculture and those wishing to learn more about the effects of non-infectious disorders and the mechanisms of response within fish and is thoroughly recommended.' Journal of Fish Diseases `Brimming with interesting details, the editors have succeeded in providing an extremely informative reference book, which should be widely consulted and appreciated by its target audience.' Fish and Fisheries
