Download or read book Charge Transport in Single Molecule Junctions written by Claudia Benesch and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charge Transport in Single molecule Junctions with Fullerene End groups written by Benjamin Gmeiner and published by . This book was released on 2010 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrocatalysis written by Richard C. Alkire and published by John Wiley & Sons. This book was released on 2013-12-16 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysts speed up a chemical reaction or allow for reactions to take place that would not otherwise occur. The chemical nature of a catalyst and its structure are crucial for interactions with reaction intermediates. An electrocatalyst is used in an electrochemical reaction, for example in a fuel cell to produce electricity. In this case, reaction rates are also dependent on the electrode potential and the structure of the electrical double-layer. This work provides a valuable overview of this rapidly developing field by focusing on the aspects that drive the research of today and tomorrow. Key topics are discussed by leading experts, making this book a must-have for many scientists of the field with backgrounds in different disciplines, including chemistry, physics, biochemistry, engineering as well as surface and materials science. This book is volume XIV in the series "Advances in Electrochemical Sciences and Engineering".
Download or read book Environmental Control of Charge Transport Through Single Molecule Junctions written by Brian John Capozzi and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This technique has the potential for application in nano-scale systems beyond single-molecule junctions. These results constitute another step toward the development of single-molecule devices with commercial applications. Finally, the methods presented in this thesis offer further insights into the electronic structure of molecular junctions. We show that we can assess energy-level alignment at metal molecule interfaces– this alignment is a crucial parameter controlling the proper- ties of the interface. We also demonstrate that we can probe large regions ( 2eV) of the transmission function which governs charge transport through the junction. By being able to control level alignment, we are also able to offer preliminary studies on single-molecule junctions in the resonant transport regime. Combined, the results presented in this thesis grant new insights into electron transport at the nanoscale and provide new routes for the development of functional single-molecule devices.
Download or read book Vibrationally Coupled Charge Transport in Single molecule Junctions written by Christoph Kaspar and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modulation and Control of Charge Transport Through Single Molecule Junctions written by Kun Wang and published by . This book was released on 2016 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building electronic devices out of single molecules has been the ultimate goal of downscaling electric circuits. Understanding charge transport through single-molecule junctions is central to achieving this goal. To gain deeper insights into charge transport through single molecules, this dissertation centers on detailed experimental modulation and control of charge transport through single-molecule junctions using modified scanning probe microscope break-junction (SPM-BJ) techniques. First, I explored the effect of molecule-electrode contact interfaces. Using force-conductance cross-correlation analysis, I mapped out the correlation between conductance and force of modulated Au-octanedithiol-Au junctions measured with CAFM-BJ. The investigation of the conductance change during junction elongation showed a unique contact tunneling barrier of octanedithiol, which was interpreted by a newly developed contact barrier model. A systematic control of anchoring groups of benzene-based molecular junctions showed that current rectification occurred whenever asymmetric anchoring groups were introduced, which is mainly due to asymmetry in potential drop across the contacts. Second, I studied the impact of DNA's structural change on its conductance. The conductance of poly d(GC)4 DNA duplex was found to decrease by two orders of magnitude during a B- to Z-form structural transition, which is mainly attributed to the breaking of Ï0-Ï0 stacking between adjacent base pairs caused by the transition. Using stretch-hold mode STM-BJ technique, the structural transition was successfully monitored solely based on conductance measurements. Then, I attempted to modify the structure of DNA for functional I-V feature. A DNA-based molecular rectifier was for the first time constructed by site-specific intercalation of coralyne molecules into a custom-designed DNA duplex. Measured I-V curves of the resulting DNA-coralyne complex showed strong rectification with a rectification ratio of 15 at 1.1V. Based on NEGF-DFT calculations, this rectification is mainly caused by asymmetric coupling of the HOMO-1 level to the electrodes when an external bias is applied, an unprecedented rectification mechanism. Finally, Fermi level pinning of charge transfer resonances was investigated in junctions composed of terthiophene containing molecular wires. Taken together, these results not only provide new understanding of charge transport through molecules, they also opened new route for building functional molecular electronic devices.
Download or read book Theoretical Study of the Charge Transport Through C60 based Single molecule Junctions written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A study of charge transport properties of single molecule junctions using density functional theory written by Ingrid Stolt and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory of Charge Transport Through Vibrating Molecules written by Yelena Simine and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charge Transport in Azobenzene Based Single Molecule Junctions written by Youngsang Kim and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contact and Length Dependent Effects in Single molecule Electronics written by Thomas Hines and published by . This book was released on 2013 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding charge transport in single molecules covalently bonded to electrodes is a fundamental goal in the field of molecular electronics. In the past decade, it has become possible to measure charge transport on the single-molecule level using the STM break junction method. Measurements on the single-molecule level shed light on charge transport phenomena which would otherwise be obfuscated by ensemble measurements of groups of molecules. This thesis will discuss three projects carried out using STM break junction. In the first project, the transition between two different charge transport mechanisms is reported in a set of molecular wires. The shortest wires show highly length dependent and temperature invariant conductance behavior, whereas the longer wires show weakly length dependent and temperature dependent behavior. This trend is consistent with a model whereby conduction occurs by coherent tunneling in the shortest wires and by incoherent hopping in the longer wires. Measurements are supported with calculations and the evolution of the molecular junction during the pulling process is investigated. The second project reports controlling the formation of single-molecule junctions by means of electrochemically reducing two axial-diazonium terminal groups on a molecule, thereby producing direct Au-C covalent bonds in-situ between the molecule and gold electrodes. Step length analysis shows that the molecular junction is significantly more stable, and can be pulled over a longer distance than a comparable junction created with amine anchoring bonds. The stability of the junction is explained by the calculated lower binding energy associated with the direct Au-C bond compared with the Au-N bond. Finally, the third project investigates the role that molecular conformation plays in the conductance of oligothiophene single-molecule junctions. Ethyl substituted oligothiophenes were measured and found to exhibit temperature dependent conductance and transition voltage for molecules with between two and six repeat units. While the molecule with only one repeat unit shows temperature invariant behavior. Density functional theory calculations show that at higher temperatures the oligomers with multiple repeat units assume a more planar conformation, which increases the conjugation length and decreases the effective energy barrier of the junction.
Download or read book Tunnelling in Molecules written by Johannes Kästner and published by Royal Society of Chemistry. This book was released on 2020-09-22 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum tunnelling is one of the strangest phenomena in chemistry, where we see the wave nature of atoms acting in “impossible” ways. By letting molecules pass through the kinetic barrier instead of over it, this effect can lead to chemical reactions even close to the absolute zero, to atypical spectroscopic observations, to bizarre selectivity, or to colossal isotopic effects. Quantum mechanical tunnelling observations might be infrequent in chemistry, but it permeates through all its disciplines producing remarkable chemical outcomes. For that reason, the 21st century has seen a great increase in theoretical and experimental findings involving molecular tunnelling effects, as well as in novel techniques that permit their accurate predictions and analysis. Including experimental, computational and theoretical chapters, from the physical and organic to the biochemistry fields, from the applied to the academic arenas, this new book provides a broad and conceptual perspective on tunnelling reactions and how to study them. Quantum Tunnelling in Molecules is the obligatory stop for both the specialist and those new to this world.
Download or read book Charge carrier Transport Measurements Through Single Molecules written by Emanuel Marc Lörtscher and published by Cuvillier Verlag. This book was released on 2007 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Single molecule Charge Transport with Mechanically Controllable Break Junction Technique written by Wenjing Hong and published by . This book was released on 2013 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hierarchical Quantum Master Equation Approaches to Nonequilibrium Charge Transport Through Single molecule Junctions written by Christian Schinabeck and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Materials Modeling written by Sidney Yip and published by Springer Science & Business Media. This book was released on 2007-11-17 with total page 2903 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first reference of its kind in the rapidly emerging field of computational approachs to materials research, this is a compendium of perspective-providing and topical articles written to inform students and non-specialists of the current status and capabilities of modelling and simulation. From the standpoint of methodology, the development follows a multiscale approach with emphasis on electronic-structure, atomistic, and mesoscale methods, as well as mathematical analysis and rate processes. Basic models are treated across traditional disciplines, not only in the discussion of methods but also in chapters on crystal defects, microstructure, fluids, polymers and soft matter. Written by authors who are actively participating in the current development, this collection of 150 articles has the breadth and depth to be a major contributor toward defining the field of computational materials. In addition, there are 40 commentaries by highly respected researchers, presenting various views that should interest the future generations of the community. Subject Editors: Martin Bazant, MIT; Bruce Boghosian, Tufts University; Richard Catlow, Royal Institution; Long-Qing Chen, Pennsylvania State University; William Curtin, Brown University; Tomas Diaz de la Rubia, Lawrence Livermore National Laboratory; Nicolas Hadjiconstantinou, MIT; Mark F. Horstemeyer, Mississippi State University; Efthimios Kaxiras, Harvard University; L. Mahadevan, Harvard University; Dimitrios Maroudas, University of Massachusetts; Nicola Marzari, MIT; Horia Metiu, University of California Santa Barbara; Gregory C. Rutledge, MIT; David J. Srolovitz, Princeton University; Bernhardt L. Trout, MIT; Dieter Wolf, Argonne National Laboratory.
Download or read book Molecular Electronics An Introduction To Theory And Experiment written by Elke Scheer and published by World Scientific. This book was released on 2010-06-23 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the rapidly developing field of molecular electronics. It focuses on our present understanding of the electrical conduction in single-molecule circuits and provides a thorough introduction to the experimental techniques and theoretical concepts. It will also constitute as the first textbook-like introduction to both the experiment and theory of electronic transport through single atoms and molecules. In this sense, this publication will prove invaluable to both researchers and students interested in the field of nanoelectronics and nanoscience in general.Molecular Electronics is self-contained and unified in its presentation. It may be used as a textbook on nanoelectronics by graduate students and advanced undergraduates studying physics and chemistry. In addition, included are previously unpublished material that will help researchers gain a deeper understanding into the basic concepts involved in the field of molecular electronics.
