Download or read book The Electronic Structure of Biomolecular Self Assembled Monolayers written by Matthaeus Anton Wolak and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The studies presented here address the characterization of the electronic structure of various self-assembled monolayers (SAMs) of peptide nucleic acid (PNA) and tetraphenylporphyrin (TPP) SAMs and arrays, formed on gold substrates. PNA is a promising alternative to DNA for bio-sensing applications, as well as for strategies for self-assembly based on nucleic acid hybridization. In recent years charge transfer through PNA molecules was a focus of research due to possible applications in self-assembled molecular circuits and molecular tools. In light of this research it is interesting to investigate the electronic structure of PNA interfaces to gold, a potential electrode material. TPP is, due to its electronic structure, an organic p-type molecular semiconductor. Such a material can provide an alternative to standard micro- and optoelectronic devices and in recent years more attention was paid to semiconducting polymers and organic compounds offering these low-cost and flexible alternatives. Therefore, it is of high importance to investigate the prospect of using modified TPP molecules for the formation of interconnected molecular networks on metallic surfaces. All investigated monolayers were formed from solution in a nitrogen atmosphere inside a homemade glove box. This process allowed for PNA SAM and TPP SAM and array formation on clean Au substrates without the exposure to the ambient atmosphere. Ultraviolet and X-ray photoemission spectroscopy (UPS and XPS) measurements on the resulting PNA SAMs and TPP SAMs and arrays, which were performed in a to the glove box attached vacuum chamber containing a photoemission spectrometer, revealed the hole injection barriers at the interfaces and the interface dipoles. In addition to the UPS and XPS measurements on PNA, electronic structure calculations based on molecular dynamics sampling of the PNA structure were obtained, yielding the HOMO-LUMO gap and the electronic density of states for PNA.
Download or read book Mixed Valency and Electronic Structure in Self assembled Monolayers Self exchange and Hydrogen Bonded Assemblies written by John Christopher Goeltz and published by . This book was released on 2011 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed valency and electron transfer are explored in self-assembled monolayers, in intermolecular electron self-exchange reactions in solution, and in hydrogen bonded assemblies. Tetrathiafulvalene is derivatized for binding to gold in self-assembled monolayers, but the trinuclear ruthenium cluster Ru3O(OAc)6L3 (where L is an ancillary ligand) is used as a building block for the majority of the work. While oxo-centered trinuclear hexaacetate clusters of many transition metals are known, the triruthenium cluster is particularly versatile because of the kinetically stable binding of a wide variety of ligands. The electronic structure can be depicted by molecular orbitals diagrams or more recently by computer generated combinations of atomic orbitals, and remains relatively unchanged for variously substituted clusters. The important differences with respect to getting an electron in or out of a cluster lie in electron delocalization onto ligand based orbitals. In combination with reorganization energies calculated from accumulated structural and vibrational data, the molecular orbital diagrams offer a great deal of explanatory power. When allowed by symmetry and energy matching, electrons in reduced clusters are delocalized onto pyridine [pi]* orbitals, greatly easing the transfer to an oxidized cluster in the face of a large reorganization energy. When electron delocalization is not allowed, electron self-exchange can be fast only if the reorganization energy is small. In hydrogen bonded assemblies of these ruthenium clusters, the electronic structure is still dominant in electron transfer behavior. In these cases the increase in delocalization upon dimerization appears to induce large changes in the orbital energies. This is consistent with the electronic absorptions and the thermal electron transfer behavior observed. The take-home message of this dissertation is that one must understand to electronic structure of a complex in order to understand its behavior in electron transfer reactions. This may seem obvious, but is often overlooked. With the knowledge of the electronic structure of reactants and products, one has a much greater chance of understanding the path between them. Molecular orbital diagrams seem cumbersome and outdated in this age of calculated chemistry, but many cases drawing them out is worth the investment in time. Who knows, you may even learn something.
Download or read book Study of the Geometry and Electronic Structure Os Self assembled Monolayers on the Au 111 Surface written by and published by . This book was released on 2008 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optically Induced Nanostructures written by Karsten König and published by Walter de Gruyter GmbH & Co KG. This book was released on 2015-05-19 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructuring of materials is a task at the heart of many modern disciplines in mechanical engineering, as well as optics, electronics, and the life sciences. This book includes an introduction to the relevant nonlinear optical processes associated with very short laser pulses for the generation of structures far below the classical optical diffraction limit of about 200 nanometers as well as coverage of state-of-the-art technical and biomedical applications. These applications include silicon and glass wafer processing, production of nanowires, laser transfection and cell reprogramming, optical cleaning, surface treatments of implants, nanowires, 3D nanoprinting, STED lithography, friction modification, and integrated optics. The book highlights also the use of modern femtosecond laser microscopes and nanoscopes as novel nanoprocessing tools.
Download or read book Biomolecular Films written by James F. Rusling and published by CRC Press. This book was released on 2003-02-26 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text examines films of biomolecules that can provide solid surfaces for catalyzing enzyme reactions, serve in biosensors and as biorecognition elements, mediate nanoparticle formation, and provide a basis for fundamental studies and applications in biomedicine and biomedical devices.
Download or read book Biomolecular Self Assembling Materials written by National Research Council and published by National Academies Press. This book was released on 1996-11-29 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-07 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. - Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures - Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials - Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems - Discusses novel approaches towards the creation of complex multiscale architectures
Download or read book Studies of the Structural and Electronic Properties of Self assembled Monolayers written by Richard Lloyd Carroll and published by . This book was released on 2001 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: STM, I/V behaviors, NDR.
Download or read book Research Methods in Biomineralization Science written by and published by Elsevier. This book was released on 2013-10-31 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume of Methods in Enzymology continues the legacy of this premier serial with quality chapters authored by leaders in the field. This volume covers research methods in biomineralization science, and includes sections on such topics as determining solution chemistry, structure and nucleation; probing structure and dynamics at surfaces; and interfaces mapping biomineral and morphology and ultrastructure. - Continues the legacy of this premier serial with quality chapters authored by leaders in the field - Covers research methods in biomineralization science - Contains sections on such topics as and includes sections on such topics as determining solution chemistry, structure and nucleation; probing structure and dynamics at surfaces; and interfaces mapping biomineral and morphology and ultrastructure
Download or read book Thermal and Rheological Measurement Techniques for Nanomaterials Characterization written by Sabu Thomas and published by Elsevier. This book was released on 2017-05-23 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal and Rheological Measurement Techniques for Nanomaterials Characterization, Second Edition covers thermal and rheological measurement techniques, including their principle working methods, sample preparation and interpretation of results. This important reference is an ideal source for materials scientists and industrial engineers who are working with nanomaterials and need to know how to determine their properties and behaviors. - Outlines key characterization techniques to determine the thermal and rheological behavior of different nanomaterials - Explains how the thermal and rheological behavior of nanomaterials affect their usage - Provides a method-orientated approach that explains how to successfully use each technique
Download or read book Dekker Encyclopedia of Nanoscience and Nanotechnology written by James A. Schwarz and published by CRC Press. This book was released on 2004 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanofabrication Using Focused Ion and Electron Beams written by Ivo Utke and published by OUP USA. This book was released on 2012-05 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews the achievements and potentials of a minimally invasive, three-dimensional, and maskless surface structuring technique operating at nanometer scale by using the interaction of focused ion and electron beams (FIB/FEB) with surfaces and injected molecules.
Download or read book Studies of the Structural and Electronic Properties of Self Assembled Monolayers Towards Molecular Electronics written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of Molecular Electronics (ME) is growing at a rapid pace. The study of materials that have utility at the level of several, or single, molecules is exciting becausethe development of these sorts of systems offers a pathway to potentially avoid the perils of continually shrinking Silicon-based fabrication. This work examines the state of the art in fabrication techniques for semiconductor systems, then examines current examples of ME to be found in the academic literature. This review is designed to plumb the depths of a few important demonstrations, as opposed to a broad overview of the entire body of work. Further, scanning probe lithography techniques are demonstrated that allow for the study of small ensembles of interesting molecules in isolation. By utilizing these techniques, the structural and electronic properties of molecules can be studied, with a focus towards determining the likely utility of a particular species in a ME framework. Experimental study of redox-active self-assembled monolayer (SAM) films shows that under specific conditions, some films display a negative differential resistance (NDR) response that has possible utility in the development of ME devices. Ferrocene- and galvinol-terminated SAMs both show NDR at room temperature. A possible mechanism for the NDR behavior is believed to be resonant tunneling through low-lying, accessible redox-states in the molecule.
Download or read book ToF SIMS written by J. C. Vickerman and published by IM Publications. This book was released on 2013 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is the most versatile of the surface analysis techniques that have been developed during the last 30 years. This is the Second Edition of the first book ToF-SIMS: Surface analysis by Mass Spectrometry to be dedicated to the subject and the treatment is comprehensive
Download or read book Biomolecular Electronics written by Paolo Facci and published by William Andrew. This book was released on 2014-04-03 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomolecular Electronics – the electrical control of biological phenomena – is a scientific challenge that, once fully realized, will find a wide range of applications from electronics and computing to medicine and therapeutic techniques.This new arena of biomolecular electronics is approached using familiar concepts from many areas such as electrochemistry, device electronics and some mechanisms of gene expression level control. Practical techniques are explored by which electrical and electronic means can be used to control biological reactions and processes. Also, the current and future applications for this new and expanding field are discussed.This book is aimed at scientists and engineers involved in both research and commercial applications across fields including bioelectronics, bionanotechnology, electrochemistry and nanomedicine – providing a state-of-the-art survey of what's going on at the boundary between biology and electronic technology at the micro- and nano- scales, along with a suggestive insight into future possible developments. - Demystifies the science and applications of electrically-driven biological reactions - Explains how the techniques of bioelectronics and electrochemistry can be deployed as biological control technologies - Provides applications information for diverse areas from bio-electrochemistry to electrical control of gene expression levels
Download or read book Electrochemical Sensors Biosensors and their Biomedical Applications written by Xueji Zhang and published by Academic Press. This book was released on 2011-04-28 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book broadly reviews the modem techniques and significant applications of chemical sensors and biosensors. Chapters are written by experts in the field – including Professor Joseph Wang, the most cited scientist in the world and renowned expert on sensor science who is also co-editor. Each chapter provides technical details beyond the level found in typical journal articles, and explores the application of chemical sensors and biosensors to a significant problem in biomedical science, also providing a prospectus for the future.This book compiles the expert knowledge of many specialists in the construction and use of chemical sensors and biosensors including nitric oxide sensors, glucose sensors, DNA sensors, hydrogen sulfide sensors, oxygen sensors, superoxide sensors, immuno sensors, lab on chip, implatable microsensors, et al. Emphasis is laid on practical problems, ranging from chemical application to biomedical monitoring and from in vitro to in vivo, from single cell to animal to human measurement. This provides the unique opportunity of exchanging and combining the expertise of otherwise apparently unrelated disciplines of chemistry, biological engineering, and electronic engineering, medical, physiological. - Provides user-oriented guidelines for the proper choice and application of new chemical sensors and biosensors - Details new methodological advancements related to and correlated with the measurement of interested species in biomedical samples - Contains many case studies to illustrate the range of application and importance of the chemical sensors and biosensors
Download or read book Self Assembly Monolayer Structures of Lipids and Macromolecules at Interfaces written by K.S. Birdi and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-assembly monolayer (SAM) structures of lipids and macromolecules have been found to play an important role in many industrial and biological phenomena. This book describes two procedures, namely the STM and AFM, that are used to study SAMs at solid surfaces. K.S. Birdi examines the SAMs at both liquid and solid surfaces by using the Langmuir monolayer method. This book is intended for researchers, academics and professionals.
