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Author: Hankyeol Jung
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
Modulation of chemical, photophysical, and electronic properties by controlling the type and concentration of carriers is an essential ability that enables semiconductor applications in a wide range of technologies. Colloidal semiconductor nanocrystals are an attractive class of solution processable and tunable semiconductor materials. Several doping strategies have been successfully applied to semiconductor nanocrystals, making them promising components of emerging technologies. Photochemical doping has emerged as a particularly attractive strategy for post-synthetic electronic doping of colloidal semiconductor nanocrystals because it is reversible, nondestructive and solution-stable. This dissertation focuses on the photochemical manipulation of nanoscale materials, including colloidal nanocrystals and cluster-based frameworks.Chapter 1 provides an introductory overview of electronic doping strategies. Furthermore, background on the classes of materials studied within, colloidal nanocrystals and cluster-based frameworks, is provided. Chapter 2 presents the photochemical reduction of colloidal maghemite nanocrystals as a means to access high-quality magnetite nanocrystals. The phase-transformation of iron oxide nanocrystal via introduction of excess carriers is analyzed by X-ray, optical, and magnetic characterization methods. Furthermore, the factors limiting photochemical reduction are discussed. Chapter 3 details the UV irradiation of colloidal 2H tungsten diselenide nanocrystals using lithium triethylborohydride. This phototreatment leads to a bleach of the band-edge absorption and an enhancement and blue-shift of the C-exciton absorption. Powder X-ray diffraction suggests that these changes are primarily due to lithium-ion intercalation into these two-dimensional materials. Chapter 4 extends the methods for electron-quantification in photochemically doped semiconductor nanocrystals do photochemically reduced cluster-based frameworks. The synthesis of cluster-based frameworks allows for in situ photodoping to access highly crystalline, reduced cluster-based frameworks. The results are used to demonstrates the unique stability of reduced Zn-bridged frameworks based on Mo-doped Preyssler clusters.
Author: Hankyeol Jung
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
Modulation of chemical, photophysical, and electronic properties by controlling the type and concentration of carriers is an essential ability that enables semiconductor applications in a wide range of technologies. Colloidal semiconductor nanocrystals are an attractive class of solution processable and tunable semiconductor materials. Several doping strategies have been successfully applied to semiconductor nanocrystals, making them promising components of emerging technologies. Photochemical doping has emerged as a particularly attractive strategy for post-synthetic electronic doping of colloidal semiconductor nanocrystals because it is reversible, nondestructive and solution-stable. This dissertation focuses on the photochemical manipulation of nanoscale materials, including colloidal nanocrystals and cluster-based frameworks.Chapter 1 provides an introductory overview of electronic doping strategies. Furthermore, background on the classes of materials studied within, colloidal nanocrystals and cluster-based frameworks, is provided. Chapter 2 presents the photochemical reduction of colloidal maghemite nanocrystals as a means to access high-quality magnetite nanocrystals. The phase-transformation of iron oxide nanocrystal via introduction of excess carriers is analyzed by X-ray, optical, and magnetic characterization methods. Furthermore, the factors limiting photochemical reduction are discussed. Chapter 3 details the UV irradiation of colloidal 2H tungsten diselenide nanocrystals using lithium triethylborohydride. This phototreatment leads to a bleach of the band-edge absorption and an enhancement and blue-shift of the C-exciton absorption. Powder X-ray diffraction suggests that these changes are primarily due to lithium-ion intercalation into these two-dimensional materials. Chapter 4 extends the methods for electron-quantification in photochemically doped semiconductor nanocrystals do photochemically reduced cluster-based frameworks. The synthesis of cluster-based frameworks allows for in situ photodoping to access highly crystalline, reduced cluster-based frameworks. The results are used to demonstrates the unique stability of reduced Zn-bridged frameworks based on Mo-doped Preyssler clusters.
Author: Katsuhiko Ariga
Publisher: Royal Society of Chemistry
ISBN: 1849734151
Category : Science
Languages : en
Pages : 488
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Book Description
Techniques and strategies for the production of nanomaterials and nanostructures have developed to an advanced level. With contributions from across the globe, this resource presents a broad spectrum of nanomaterials and their applications.
Author: Alexander I. Kokorin
Publisher: CRC Press
ISBN:
Category : Architecture
Languages : en
Pages : 288
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Book Description
Deep and detailed discussions on chemistry, chemical physics, photoelectrochemistry, photophysics, photocatalysis and possible applications of nanostructured semiconductor materials have shown increasing interest in the matter by scientists representing various research areas as well as industrial enterprises. Indeed, solar energy conversion and chemical methods for its realization became very popular again after the “great jump” of renewable energy sources between the middle of the 1970s and the beginning of the 1980s. Several excellent books have been published over the past years, however, in these books no attempt was made to approach this research area from the point of view of classical chemical physics. With this book, the editors aim: a) to generate an adequate scope of the modern trends and data obtained during the last years in the area of chemical physics of nanostructured materials, in particular, nanocrystalline semiconductors; b) to select an equal mix of scientists from Western and Eastern countries, all of them experts in their respective research areas; and c) to present to the international scientific community many interesting and important results which have been obtained by former Soviet Union researchers, but are not well known because they had originally been published in Russian books and journals. This book will be interesting and useful for scientists working in the area of semiconductor nanotechnology, photoelectrochemistry, photocatalysis, photochemistry of water and air purification, as well as for graduate and post-graduate students who are planning to join these research areas.
Author: Neelu Chouhan
Publisher: CRC Press
ISBN: 1315279649
Category : Science
Languages : en
Pages : 379
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Book Description
Cleavage of water to its constituents (i.e., hydrogen and oxygen) for production of hydrogen energy at an industrial scale is one of the "holy grails" of materials science. That can be done by utilizing the renewable energy resource i.e. sunlight and photocatalytic material. The sunlight and water are abundant and free of cost available at this planet. But the development of a stable, efficient and cost-effective photocatalytic material to split water is still a great challenge. To develop the effective materials for photocatalytic water splitting, various type of materials with different sizes and structures from nano to giant have been explored that includes metal oxides, metal chalcogenides, carbides, nitrides, phosphides, and so on. Fundamental concepts and state of art materials for the water splitting are also discussed to understand the phenomenon/mechanism behind the photoelectrochemical water splitting. This book gives a comprehensive overview and description of the manufacturing of photocatalytic materials and devices for water splitting by controlling the chemical composition, particle size, morphology, orientation and aspect ratios of the materials. The real technological breakthroughs in the development of the photoactive materials with considerable efficiency, are well conversed to bring out the practical aspects of the technique and its commercialization.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
Author: Fabian Ifeanyichukwu Ezema
Publisher: CRC Press
ISBN: 1000894185
Category : Science
Languages : en
Pages : 747
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Book Description
The book Materials for Sustainable Energy Storage Devices at the Nanoscale anticipates covering all electrochemical energy storage devices such as supercapacitors, lithium-ion batteries (LIBs), and fuel cells, transformation and enhancement materials for solar cells, photocatalysis, etc. The focal objective of the book is to deliver stunning and current information to the materials application at nanoscale to researchers and scientists in our contemporary time towardthe enhancement of energy conversion and storage devices. However, the contents of the proposed book, Materials for Sustainable Energy Storage at the Nanoscale, will cover various fundamental principles and wide knowledge of different energy conversion and storage devices with respect to their advancement due to the emergence of nanoscale materials for sustainable storage devices. This book is targeted to be award-winning as well as a reference book for researchers and scientists working on different types of nanoscale materials-based energy storage and conversion devices. Features Comprehensive overview of energy storage devices, an important field of interest for researchers worldwide Explores the importance and growing impact of batteries and supercapacitors Emphasizes the fundamental theories, electrochemical mechanism, and its computational view point and discusses recent developments in electrode designing based on nanomaterials, separators, and fabrication of advanced devices and their performances Fabian I. Ezema is a professor at the University of Nigeria, Nsukka. He earned a PhD in Physics and Astronomy from the University of Nigeria, Nsukka. His research focused on several areas of Materials Science, from synthesis and characterizations of particles and thin-film materials through chemical routes with emphasis on energy applications. For the last 15 years, he has been working on energy conversion and storage (cathodes, anodes, supercapacitors, solar cells, among others), including novel methods of synthesis, characterization and evaluation of the electrochemical and optical properties. He has published about 180 papers in various international journals and given over 50 talks at various conferences. His h-index is 21 with over 1500 citations and he has served as reviewer for several high impact journals and as an editorial board member. Dr. M.Anusuya, M.Sc., M.Phil., B.Ed., PhD is specialized in Material science, Thin Film Technology, Nano Science, and Crystallography. She is working as a Registrar of Indra Ganesan Group of Institutions, Trichy, Tamilnadu, India. Earlier to this, she served as a Vice-Principal at Trichy Engineering College, Trichy, Tamilnadu, India.. Being an administrator and teacher, with more than 25 years’ experience, for her perpetual excellence in academics she has been recognized with many awards. She has received over 45 awards in Academic and Social Activity. She has published more than 30 research papers in National and International journals, 7 chapters in edited books, 5 patents, presented 50 papers in the conferences and organized more than 200 webinars, both national and internationally. Dr Assumpta C. Nwanya is a Lecturer and a FLAIR (Future Leaders - African Independent Research) Scholar at the Department of Physics and Astronomy, University of Nigeria, Nsukka. She obtained her PhD in 2017 (University of Nigeria, Nsukka) with specialisation in the synthesis of nanostructured materials for applications in photovoltaics and electrochemical energy storage (batteries and supercapacitors) as well as for sensing. She was a Postdoctoral Fellow under the UNESCO-University of South Africa (UNISA) Africa Chair in Nanoscience and Nanotechnology (2018-2020). She is a research Affiliate with the SensorLab, University of the Western Cape Sensor Laboratories, Cape Town, South Africa. Dr Nwanya is a very active researcher and has published more than 85 scientific articles in high impact journals and has a Google Scholar’s H-index of 24 and 1475 citations.
Author: Detlef Bahnemann
Publisher: Springer Nature
ISBN: 3030637131
Category : Science
Languages : en
Pages : 1914
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Book Description
The handbook comprehensively covers the field of inorganic photochemistry from the fundamentals to the main applications. The first section of the book describes the historical development of inorganic photochemistry, along with the fundamentals related to this multidisciplinary scientific field. The main experimental techniques employed in state-of-art studies are described in detail in the second section followed by a third section including theoretical investigations in the field. In the next three sections, the photophysical and photochemical properties of coordination compounds, supramolecular systems and inorganic semiconductors are summarized by experts on these materials. Finally, the application of photoactive inorganic compounds in key sectors of our society is highlighted. The sections cover applications in bioimaging and sensing, drug delivery and cancer therapy, solar energy conversion to electricity and fuels, organic synthesis, environmental remediation and optoelectronics among others. The chapters provide a concise overview of the main achievements in the recent years and highlight the challenges for future research. This handbook offers a unique compilation for practitioners of inorganic photochemistry in both industry and academia.
Author: Thomas M. Nordlund
Publisher: CRC Press
ISBN: 1351801171
Category : Science
Languages : en
Pages : 870
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Book Description
Praise for the prior edition "The author has done a magnificent job... this book is highly recommended for introducing biophysics to the motivated and curious undergraduate student." ―Contemporary Physics "a terrific text ... will enable students to understand the significance of biological parameters through quantitative examples―a modern way of learning biophysics." ―American Journal of Physics "A superb pedagogical textbook... Full-color illustrations aid students in their understanding" ―Midwest Book Review This new edition provides a complete update to the most accessible yet thorough introduction to the physical and quantitative aspects of biological systems and processes involving macromolecules, subcellular structures, and whole cells. It includes two brand new chapters covering experimental techniques, especially atomic force microscopy, complementing the updated coverage of mathematical and computational tools. The authors have also incorporated additions to the multimedia component of video clips and animations, as well as interactive diagrams and graphs. Thomas Nordlund is professor emeritus in the Department of Physics at The University of Alabama at Birmingham. He is an elected fellow of the American Physical Society and has been studying biomolecular dynamics for over thirty years. Peter M. Hoffmann is a professor in the Department of Physics and Astronomy at Wayne State University in Detroit, Michigan, where he founded the biomedical physics program. He has been involved in soft matter and biophysics research for twenty-five years, and earned his PhD in materials science and engineering from Johns Hopkins University.
Author: Muhammad Bilal Tahir
Publisher: Elsevier
ISBN: 0128211970
Category : Technology & Engineering
Languages : en
Pages : 248
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Book Description
Nanotechnology and Photocatalysis for Environmental Applications focuses on nanostructured control, synthesis methods, activity enhancement strategies, environmental applications, and perspectives of semiconductor-based nanostructures. The book offers future guidelines for designing new semiconductor-based photocatalysts, with low cost and high efficiency, for a range of products aimed at environmental protection. The book covers the fundamentals of nanotechnology, the synthesis of nanotechnology, and the use of metal oxide, metal sulfide, and carbon-based nanomaterials in photocatalysis. The book also discusses the major challenges of using photocatalytic nanomaterials on a broad scale. The book then explores how photocatalytic nanomaterials and nanocomposites are being used for sustainable development applications, including environmental protection, pharmaceuticals, and air purification. The final chapter considers the recent advances in the field and outlines future perspectives on the technology. This is an important reference for materials scientists, chemical engineers, energy scientists, and anyone looking to understand more about the photocatalytic potential of nanomaterials, and their possible environmental applications. Explains why the properties of semiconductor-based nanomaterials make them particularly good for environmental applications Explores how photocatalytic nanomaterials and nanocomposites are being used for sustainable development applications, including environmental protection, pharmaceuticals, and air purification Discusses the major challenges of using photocatalytic nanomaterials on a broad scale
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309102707
Category : Science
Languages : en
Pages : 245
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Book Description
As part of the Physics 2010 decadal survey project, the Department of Energy and the National Science Foundation requested that the National Research Council assess the opportunities, over roughly the next decade, in atomic, molecular, and optical (AMO) science and technology. In particular, the National Research Council was asked to cover the state of AMO science, emphasizing recent accomplishments and identifying new and compelling scientific questions. Controlling the Quantum World, discusses both the roles and challenges for AMO science in instrumentation; scientific research near absolute zero; development of extremely intense x-ray and laser sources; exploration and control of molecular processes; photonics at the nanoscale level; and development of quantum information technology. This book also offers an assessment of and recommendations about critical issues concerning maintaining U.S. leadership in AMO science and technology.
