Download or read book Developments of New Mixed Valence Compounds for Optoelectronics and Molecular Electronics Through Multi step Organic Synthesis written by Gaoquan Li and published by . This book was released on 2008 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mixed Valence Compounds written by D.B. Brown and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been a decade since two seminal reviews demonstrated that mixed-valence compounds share many unique and fascinating features. The insight pro vided by those early works has promoted a great deal of both experimental and theoretical study. As a result of extensive efforts, our understanding of the bonding and properties of mixed-valence compounds has advanced substantially. There has been no compre hensive treatment of mixed-valence compounds since 1967, and the meeting convened at Oxford in September, 1979, provided a unique opportunity to examine the subject and its many ramifications. Mixed-valence compounds play an important role in many fields. Although the major impact of the subject has been in chemistry, its importance has become increasingly clear in solid state physics, geology, and biology. Extensive interest and effort in the field of molecular metals has demonstrated that mixed-valency is a prerequisite for high elec trical conductivity. The intense colors of many minerals have been shown to be due to mixed-valency, and the electron-transfer properties of certain mixed-valence metalloproteins are important in biological processes. Experts from all of these areas participated in this meeting, and the truly interdisciplinary nature of the subject made it a unique learning experience for all in attendance.
Download or read book Supramolecular Materials for Opto Electronics written by Norbert Koch and published by Royal Society of Chemistry. This book was released on 2015 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: For years, concepts and models relevant to the fields of molecular electronics and organic electronics have been invented in parallel, slowing down progress in the field. This book illustrates how synthetic chemists, materials scientists, physicists, and device engineers can work together to reach their desired, shared goals, and provides the knowledge and intellectual basis for this venture. Supramolecular Materials for Opto-Electronics covers the basic principles of building supramolecular organic systems that fulfil the requirements of the targeted opto-electronic function; specific material properties based on the fundamental synthesis and assembly processes; and provides an overview of the current uses of supramolecular materials in opto-electronic devices. To conclude, a "what's next" section provides an outlook on the future of the field, outlining the ways overarching work between research disciplines can be utilised. Postgraduate researchers and academics will appreciate the fundamental insight into concepts and practices of supramolecular systems for opto-electronic device integration.
Download or read book The Effects of Electronic Delocalization in Highly Coupled Mixed Valence Systems written by Benjamin James Lear and published by . This book was released on 2007 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The trinuclear ruthenium cluster RuO(OAc)6L3 (where L is an ancillary ligand) is used to make a variety of mixed valence compounds in which two or more clusters are joined together by an organic bridging ligand. The magnitude of electronic coupling in the mixed valance state of these compounds is quite large and the complexes reside on the Robin-Day class II/class III borderline. The large degree of coupling in these complexes gives rise to ultrafast electron transfer whose effects are observable in the infrared (IR) spectra of these complexes. Utilizing the IR properties of the complexes we are able to arrive at thermodynamic estimates of the electronic coupling parameter (H AB) for asymmetric mixed valence compounds. These asymmetric compounds give rise to mixed valence isomers and the temperature dependence of the isomer populations is used to determine deltaH and deltaS for the electron transfer event in these complexes. The large coupling in these complexes reduces the barrier to electron transfer significantly (enabling ultrafast electron transfer). This places the rate of electron transfer under the control of the nuclear dynamics of the complex and the surrounding environment. The result is that the rate of electron transfer in these mixed valence complexes shows a strong dependence on kinetic parameters of the solvent (those that describe the movement of the nuclei of the system), but not on thermodynamic parameters of the solvent (that describe more static energetic contributions of the environment). This, in turn, leads to an unexpected temperature dependence of the electron transfer rate. It is found that the electron transfer rate dramatically increases when the solvent is frozen. This results form a decoupling of the relatively slow solvent motions from the electron transfer event allowing for the faster internal vibrational motions of the mixed valence complex to control the rate of electron transfer. The effects of the large electronic coupling in these complexes also gives rise to other surprising behaviors. The extent of the electronic coupling in the mixed valence systems is known to depend on the electron donor strength of the attached ancillary ligands. It is shown that, through supramoleuclar interactions at the ancillary ligands of these mixed valence systems, the electronic coupling may be modulated. There is a significant decrease in the resonance stabilization associated with breaking of symmetry in a mixed valence system and that this energy (together with the energy gained by restoration of symmetry) can provide substantial driving force for chemical interactions. This effect is explained in terms of both the direct stabilization of the compound through electronic coupling and in terms of resonance stabilization of the unpaired electron in the mixed valence compound. This result is then extended to molecular electronics where it is shown that changes in current effected by a chemical interaction can provide a driving force for said chemical interaction. The large magnitude of electronic coupling in these mixed valence systems is also shown to be sufficient to stabilize as the ground state what would be thought of as low-lying excited states. It is shown that an electron may transfer from a cluster to the bridging ligand and that this electron transfer gives rise to an increase in electronic coupling throughout the mixed valence state. This increase in electronic coupling is found to be sufficient to stabilize the radical state of the organic bridge. The large energy difference between uncoupled (diabatic) and coupled (adiabatic) mixed valence compounds is also exploited in order to determine whether an electron entering into the mixed valence molecule enters into a diabatic or adiabatic wavefunction. The electron transfer rate from photo-generated triplet zinc tetraphenylphorpyrin to the mixed valence compounds was observed. Comparisons of the observed electron transfer rate to the diabatic and adiabatic driving force for electron transfer are made. It is concluded that the electron enters into a diabatic wavefunciton of the mixed valence compound after which the compound evolves into the adiabatic wavefunciton. The major theme throughout this thesis is the exploitation of the huge value of electronic coupling (H AB) in order to give rise to and explain some very unique and unexpected behaviors of these mixed valence complexes.
Download or read book Small Organic Molecules on Surfaces written by Helmut Sitter and published by Springer Science & Business Media. This book was released on 2013-02-19 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with basic aspects of polymer electronics and optoelectronics. There is an enormous world-wide effort both in basic scientific research as well as in industrial development in the area of organic electronics. It is becoming increasingly clear that, if devices based on organic materials are ever going to have a significant relevance beyond being a cheap replacement for inorganic semiconductors, there will be a need to understand interface formation, film growth and functionality. A control of these aspects will allow the realisation of totally new device concepts exploiting the enormous flexibility inherent in organic chemistry. In this book we focus on oligomeric/molecular films as we believe that the control of molecular structures and interfaces provides highly defined systems which allow, on the one hand the study of the basic physics and on the other hand to find the important parameters necessary to improve organic devices.
Download or read book Organic Electronics From Synthesis To Applications written by John George Hardy and published by Frontiers Media SA. This book was released on 2020-02-03 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic electronics is one of the most exciting emerging areas of materials science. It is a highly interdisciplinary research area involving scientists and engineers who develop organic molecules with interesting properties for a variety of applications in technical industries (e.g. circuitry, energy harvesting/storage, etc.) and medical applications (e.g. bioelectronics for sensors, tissue scaffolds for tissue engineering, etc.). This Research Topic collects articles that report advances in chemistry (e.g. design and synthesis of molecules with various molecular weights and structures); physical chemistry and chemical physics, and computational/theoretical research (e.g. to push the boundaries of our understanding); chemical engineering (e.g. design, prototyping and manufacturing devices); materials scientists and technologists to explore different markets for the technologies employing such materials, the organic bioelectronics field and green/sustainable electronics.
Download or read book Mixed Valence Compounds written by D.B. Brown and published by Springer. This book was released on 1980-09-30 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been a decade since two seminal reviews demonstrated that mixed-valence compounds share many unique and fascinating features. The insight pro vided by those early works has promoted a great deal of both experimental and theoretical study. As a result of extensive efforts, our understanding of the bonding and properties of mixed-valence compounds has advanced substantially. There has been no compre hensive treatment of mixed-valence compounds since 1967, and the meeting convened at Oxford in September, 1979, provided a unique opportunity to examine the subject and its many ramifications. Mixed-valence compounds play an important role in many fields. Although the major impact of the subject has been in chemistry, its importance has become increasingly clear in solid state physics, geology, and biology. Extensive interest and effort in the field of molecular metals has demonstrated that mixed-valency is a prerequisite for high elec trical conductivity. The intense colors of many minerals have been shown to be due to mixed-valency, and the electron-transfer properties of certain mixed-valence metalloproteins are important in biological processes. Experts from all of these areas participated in this meeting, and the truly interdisciplinary nature of the subject made it a unique learning experience for all in attendance.
Download or read book Design of Electronic Devices Using Redox Active Organic Molecules and Their Porous Coordination Networks written by Jaejun Kim and published by Springer. This book was released on 2022-08-25 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the development of electronic devices using redox-active organic molecules and their porous coordination networks (PCNs), and highlights the importance of the molecular arrangement. Redox-active organic molecules hold considerable promise as flexible electronic elements, because their electronic state can easily be controlled using external energy. Although various kinds of redox-active organic molecules have been synthesized, attempts to apply them to electronic devices have been limited, owing to the lack of proper structural design. Moreover, ligand-based redox-active PCNs remain largely unexplored because of the limited availability of redox-active ligands. In addition to developing new redox-active organic molecules, in order to design electronic devices based on these molecules/PCNs, it is essential to understand the connections between their molecular arrangement, electrical properties, and redox activity. In this thesis, the redox-active organic molecule 2,5,8-tri(4-pyridyl)1,3-diazaphenalene (TPDAP), which features a large pi plane and multi-intermolecular interactivity, is used to develop a resistive switching memory device. In addition, its PCNs are synthesized to fabricate chemiresistive sensors, and the electrical properties are modulated using post-synthetic modification. Each mechanism is systematically investigated by means of structural determination and well-defined control experiments. Subsequently, the book proposes general guidelines for designing electronic devices using redox-active organic molecules. The book will appeal to a broad range of readers, from basic scientists to materials engineers, as well as general, non-expert readers.
Download or read book Mixed Valence Compounds written by D. B. Brown and published by . This book was released on 2014-01-15 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Interfaces to Electronic Materials written by and published by . This book was released on 2013 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to introduce specific molecular groups to the surfaces of semiconductors holds great promise in photovoltaics, catalysis, sensing, and molecular electronics. This thesis describes the covalent functionalization of ZnO and diamond surfaces with a variety of different organic, inorganic, and organometallic groups. The first part of this thesis investigates the photochemical grafting of organic alkenes on the (101-0) surface of single crystal ZnO and ZnO nanorods. The molecular layers are shown to be conformal to the underlying ZnO with a thickness controlled by the illumination time. The ability to perform multi-step synthetic chemistry on the ZnO surface is demonstrated. The second part of this thesis looks at the formation of redox-active diamond surfaces. A combination of photochemical grafting and click chemistry (copper catalyzed azide alkyne cycloaddition) is used to couple inorganic and organometallic complexes to the diamond surface. A model ruthenium complex [Ru(tpy)2] tethered to the surface demonstrates remarkable stability to potential cycling out to very strongly oxidizing potentials (1.5 V vs. NHE). The electron transfer rate between diamond electrodes and surface-tethered ferrocene is also measured using electrochemical impedance spectroscopy. The electron transfer rate is shown to decrease with increasing surface coverage but is found to be independent of chain length. Electron transfer rates are generally fast, typically 1,000-10,000 per second.
Download or read book Molecular Valence in Organic Compounds written by H. O. Albrecht and published by . This book was released on 1922 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Oxides in Supercapacitors written by Deepak P. Dubal and published by Elsevier. This book was released on 2017-07-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Oxides in Supercapacitors addresses the fundamentals of metal oxide-based supercapacitors and provides an overview of recent advancements in this area. Metal oxides attract most of the materials scientists use due to their excellent physico-chemical properties and stability in electrochemical systems. This justification for the usage of metal oxides as electrode materials in supercapacitors is their potential to attain high capacitance at low cost. After providing the principles, the heart of the book discusses recent advances, including: binary metal oxides-based supercapacitors, nanotechnology, ternary metal oxides, polyoxometalates and hybrids. Moreover, the factors affecting the charge storage mechanism of metal oxides are explored in detail. The electrolytes, which are the soul of supercapacitors and a mostly ignored character of investigations, are also exposed in depth, as is the fabrication and design of supercapacitors and their merits and demerits. Lastly, the market status of supercapacitors and a discussion pointing out the future scope and directions of next generation metal oxides based supercapacitors is explored, making this a comprehensive book on the latest, cutting-edge research in the field. - Explores the most recent advances made in metal oxides in supercapacitors - Discusses cutting-edge nanotechnology for supercapacitors - Includes fundamental properties of metal oxides in supercapacitors that can be used to guide and promote technology development - Contains contributions from leading international scientists active in supercapacitor research and manufacturing
Download or read book The Engineering Index Annual written by and published by . This book was released on 1992 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Download or read book Molecular Beam Epitaxy written by Mohamed Henini and published by Elsevier. This book was released on 2018-06-27 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Beam Epitaxy (MBE): From Research to Mass Production, Second Edition, provides a comprehensive overview of the latest MBE research and applications in epitaxial growth, along with a detailed discussion and 'how to' on processing molecular or atomic beams that occur on the surface of a heated crystalline substrate in a vacuum. The techniques addressed in the book can be deployed wherever precise thin-film devices with enhanced and unique properties for computing, optics or photonics are required. It includes new semiconductor materials, new device structures that are commercially available, and many that are at the advanced research stage. This second edition covers the advances made by MBE, both in research and in the mass production of electronic and optoelectronic devices. Enhancements include new chapters on MBE growth of 2D materials, Si-Ge materials, AIN and GaN materials, and hybrid ferromagnet and semiconductor structures. - Condenses the fundamental science of MBE into a modern reference, speeding up literature review - Discusses new materials, novel applications and new device structures, grounding current commercial applications with modern understanding in industry and research - Includes coverage of MBE as mass production epitaxial technology and how it enhances processing efficiency and throughput for the semiconductor industry and nanostructured semiconductor materials research community
Download or read book Handbook of Thiophene Based Materials written by Igor F. Perepichka and published by John Wiley & Sons. This book was released on 2009-07-17 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: This essential resource consists of a series of critical reviews written by leading scientists, summarising the progress in the field of conjugated thiophene materials. It is an application-oriented book, giving a chemists’ point of view on the state-of-art and perspectives of the field. While presenting a comprehensive coverage of thiophene-based materials and related applications, the aim is to show how the rational molecular design of materials can bring a new breadth to known device applications or even aid the development of novel application concepts. The main topics covered include synthetic methodologies to thiophene-based materials (including the chemistry of thiophene, preparation of oligomers and polymerisation approaches) and the structure and physical properties of oligo- and polythiophenes (discussion of structural effects on electronic and optical properties). Part of the book is devoted to the optical and semiconducting properties of conjugated thiophene materials for electronics and photonics, and the role of thiophene-based materials in nanotechnology.
Download or read book Electronic Processes in Organic Semiconductors written by Anna Köhler and published by John Wiley & Sons. This book was released on 2015-06-08 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first advanced textbook to provide a useful introduction in a brief, coherent and comprehensive way, with a focus on the fundamentals. After having read this book, students will be prepared to understand any of the many multi-authored books available in this field that discuss a particular aspect in more detail, and should also benefit from any of the textbooks in photochemistry or spectroscopy that concentrate on a particular mechanism. Based on a successful and well-proven lecture course given by one of the authors for many years, the book is clearly structured into four sections: electronic structure of organic semiconductors, charged and excited states in organic semiconductors, electronic and optical properties of organic semiconductors, and fundamentals of organic semiconductor devices.
