Download or read book Constructing Two dimensional Molecular Networks on Metal and Semiconducting Surfaces written by Renjie Liu and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of two-dimensional organic nanostructures on metal and semiconducting surfaces is studied under ultra-high vacuum (UHV) conditions. Three halogenated organic molecules are investigated using scanning tunneling microscopy (STM) on both metal and semiconducting substrates. The first system studied is the adsorption of brominated tetrathienoanthracene (TBTTA) molecules onto the Si(111) √3×√3 R30°-Ag (Si(111) √3-Ag) surface at room temperature. STM images reveal that at low coverage, the molecules readily migrate to step edges and defects in the √3 overlayer. With increasing coverage, the molecules eventually form compact supramolecular structures. At higher coverage (0.4 - 0.6 monolayers), the spatial extent of the supramolecular structures is often limited by defects in the underlying √3 layer. Our results suggest that the √3-Ag surface provides a relatively inert substrate for the adsorption of TBTTA molecules, and that the supramolecular structures are held together by relatively weak intermolecular forces. The second organic molecule investigated is 2,4,6-tris(4-iodophenyl)-1,3,5-triazine (TIPT). Molecules are deposited onto two related surfaces, Ag(111) and Si(111) √3-Ag. On the Ag(111) surface, TIPT molecules dehalogenate spontaneously upon deposition and form organometallic structures at room temperature. Gentle annealing at ~ 100 °C leads to a more ordered molecular network characterized almost exclusively by hexagons and polymerization was confirmed after further annealing at ~135 °C. On the Si(111) √3-Ag surface TIPT molecules remain largely intact and readily diffuse to step edges and defects in the √3 overlayer. At low coverage, most images display regularly spaced "fuzzy lines" which indicate molecular diffusion at room temperature. At higher coverage (0.4 - 0.8 monolayers), supramolecular domains are formed. The geometry of the cell is similar to an energy optimized 2-d free-standing TIPT layer determined by DFT indicating that de-halogenation does not occur on the Si(111) √3-Ag surface at room temperature and that the supramolecular domains are characterized by zig-zag rows of intact monomers held together primarily by I···H hydrogen-like bonding. Finally, the adsorption of 2,6,10-tribromo-4,8,12-trioxa-3a2-azadibenzo[cd,mn]pyrene (TBTANG) molecules is detailed on both Au(111) and Si(111) √3-Ag surfaces. Dosing TBTANG molecules onto a Au(111) surface at room temperature leads to the self-assembly of intact molecules while deposition onto a hot Au(111) surface yields a complete polymer layer. On the Si(111) √3-Ag surface the molecules display high mobility. With increasing coverage, TBTANG exhibits long-range self-assembly of intact molecules. As the coverage approaches one monolayer, the self-assembled layer extends over the entire surface. Defects in the √3-Ag substrate affect the integrity of domains, but do not limit the size. Preliminary annealing experiments do not lead to polymerization of the TBTANG layer. Rather, annealing at ~ 90°C leads to disordered regions which nucleate primarily at step edges.

Download or read book Constructing Low dimensional Molecular Networks on Metal Surfaces written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Encyclopedia of Interfacial Chemistry written by and published by Elsevier. This book was released on 2018-03-29 with total page 5276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry, Seven Volume Set summarizes current, fundamental knowledge of interfacial chemistry, bringing readers the latest developments in the field. As the chemical and physical properties and processes at solid and liquid interfaces are the scientific basis of so many technologies which enhance our lives and create new opportunities, its important to highlight how these technologies enable the design and optimization of functional materials for heterogeneous and electro-catalysts in food production, pollution control, energy conversion and storage, medical applications requiring biocompatibility, drug delivery, and more. This book provides an interdisciplinary view that lies at the intersection of these fields. Presents fundamental knowledge of interfacial chemistry, surface science and electrochemistry and provides cutting-edge research from academics and practitioners across various fields and global regions

Download or read book Electrochemistry of N4 Macrocyclic Metal Complexes written by Jose H. Zagal and published by Springer. This book was released on 2016-05-03 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition describes the state of the art regarding metal complexes of N4-ligands, such as porphyrins and phthalocyanines. Volume 2 focuses on the electro assisted use of N4 complexes as biomimetic models for studying several biological redox processes. It focuses on molecular oxygen transport and catalytic activation to mimic monooxygenase enzymes of the cytochrome P450 in particular. It also examines N4 complexes’ use as catalysts for the oxidative degradation of various types of pollutants (organo-halides, for example) and residual wastes. The remarkable activity of these complexes towards a large number of significantly relevant biological compounds makes them excellent candidates as electrode modifiers for electrochemical sensing. This volume also discusses applications of N4 Macrocyclic Metal Complexes to photoelectrochemistry and photocatalysis, and concludes with an exciting section on Electrosynthesis of N4.

Download or read book Exotic Properties of Multi dimensional Molecular Systems on Metal Surfaces written by Shaoze Wang and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscience research is important to our life. Exotic properties of molecules are of interest to physics, chemistry, biology, materials science and even industries for their applications ranging from the nature of molecular synthesis to optical, electronic, and biological use as well as quantum information processing. Using a scanning tunneling microscope tip as a characterization and manipulation tool, individual molecules as well as some self-assembled networks of four molecular systems on metal surfaces are investigated in this dissertation. Depending on the uniqueness of the system of study, the investigations include electronic, vibronic, structural, and mechanical properties of individual molecules or self-assembled molecular networks at the atomically clean environment. As one type of blue organic light emission diode (OLED), sexiphenyl molecule offers great applications in light emission with its unique electronic structure. Molecular vibrations are important for understanding its energetic dissipation. In order to understand the molecular vibrations, first, physical properties of 1D sexiphenyl molecules are characterized. Then vibrational modes of sexiphenyl molecules adsorbed on Ag(111) are studied. Two molecular vibrational modes are found at one monolayer of sexiphenyl film. In addition, the surface phonon excitation of the Ag(111) substrate is verified to be coupled with the molecular vibrations. Metal-organic frameworks are useful in their gas separation, fuel storage and catalysis. Moreover, similar to their semiconductor counterpart, the heterostructure of MOFs also plays a key platform for band gap tuning, band alignment and charge confinement. Here, physical structures of self-assembled molecular networks of 1D terphenyl and sexiphenyl molecules are studied. The exotic patterns of zigzag and honeycomb networks are formed in specific deposition conditions and metal organic framework (MOF) models are proposed to explain the periodical unit formations. A structural transition between two different MOFs is observed in the molecular heterostructure. Lateral manipulations of individual molecules demonstrate the flexibility of the bent structures while the electronic properties of sexiphenyl molecules provide the energy gaps. Then the electronic structures at the interface between two different networks are investigated. Rare earth molecules are of interest to the research due to their strong magnetic behaviors. Protected by the outer shell electron clouds, the inner 4f shell electrons own dominating spin-orbit couplings and lead to their applications in quantum regime as well as photon upconversion. In addition, chirality in the molecular networks have potential usage in chiral induced spin selectivity and may be regarded as a spin filter. In order to explore the physics behind a rare earth based self-assembled molecular networks, a molecular system, Eu(Pcam-Br)3, adsorbed on Au(111)surface is investigated. Self-assembled hexagonal networks of Eu(Pcam-Br)3 molecules are formed by the same dog-bone shape basic molecular units, which are composed of two individual molecules covalently linked via Ullmann coupling mechanism. Hexagonal symmetry of self-assembly is achieved by six basic units forming a gear shape structure. Furthermore, these gear shape structures exhibit left and right handedness and thus the entire hexagonal network become chiral. The origin of chirality is traced to the unique asymmetric structure of each basic molecular unit. Molecular propeller is one type of molecular machine, and can be utilized to fulfill the gear chain rotations at nanoscale. For the sake of investigating functional rotational applications, a 3D molecular propeller is studied with a focus on its mechanical and inelastic electron tunneling (IET) induced rotations. Unidirectional rotations based on chirality are performed either in clockwise or counterclockwise directions by laterally manipulating with a scanning tunneling microscope tip. Statistical analysis on the switching events unveils the mechanical and electronic processes of the detailed molecular rotations. Using the scanning tunneling microscope tip and metal substrate as the electrode, four different molecular systems are investigated in various aspects. The exotic properties in single molecules and self-assembled molecular networks exhibit the huge importance to scientific discoveries as well as industrial applications. Here, the studies in this dissertation provide the basic physical understandings of the molecular systems at the atomic scale

Download or read book From Building Blocks to 2D Networks written by Georg Eder and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2013 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this work was to improve the understanding of the important parameters in the formation process of 2D nanostructures (e.g. self-assembled structures, metal-organic frameworks, covalent organic frameworks) and, therefore, pioneer for novel applications. 2D nanostructures are composed of specially designed building blocks - organic molecules that are functionalized either with carboxylic groups, halogens, or thiols groups. These building blocks are able to form true 2D nanostructures by adsorption on various surfaces (e.g. graphite, metals). Their properties and chemical reactions during the formation process have been investigated by scanning tunneling microscopy (STM) under ultra-high vacuum conditions as well as under ambient conditions. Complementary surface analysis techniques such as low-energy electron di raction, X-Ray photo-emission spectroscopy, and Raman spectroscopy were used when necessary to characterize these novel molecular networks."

Download or read book Two Dimensional Self assembled Molecular Networks Via on Surface Reactions written by Anamaria Trandafir and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 2D Metal Carbides and Nitrides MXenes written by Babak Anasori and published by Springer Nature. This book was released on 2019-10-30 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the rapidly expanding field of two-dimensional (2D) transition metal carbides and nitrides (MXenes). It covers fundamental knowledge on synthesis, structure, and properties of these new materials, and a description of their processing, scale-up and emerging applications. The ways in which the quickly expanding family of MXenes can outperform other novel nanomaterials in a variety of applications, spanning from energy storage and conversion to electronics; from water science to transportation; and in defense and medical applications, are discussed in detail.

Download or read book Nanoparticle Assemblies and Superstructures written by Nicholas A. Kotov and published by CRC Press. This book was released on 2016-04-19 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cubes, triangular prisms, nano-acorn, nano-centipedes, nanoshells, nano-whiskers. . . . Now that we can create nanoparticles in a wide variety of shapes and morphologies, comes the next challenge: finding ways to organize this collection of particles into larger and more complex systems. Nanoparticle Assemblies and Superstructures, edit

Download or read book Comprehensive Nanoscience and Technology written by and published by Academic Press. This book was released on 2010-10-29 with total page 2785 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the Introduction: Nanotechnology and its underpinning sciences are progressing with unprecedented rapidity. With technical advances in a variety of nanoscale fabrication and manipulation technologies, the whole topical area is maturing into a vibrant field that is generating new scientific research and a burgeoning range of commercial applications, with an annual market already at the trillion dollar threshold. The means of fabricating and controlling matter on the nanoscale afford striking and unprecedented opportunities to exploit a variety of exotic phenomena such as quantum, nanophotonic and nanoelectromechanical effects. Moreover, researchers are elucidating new perspectives on the electronic and optical properties of matter because of the way that nanoscale materials bridge the disparate theories describing molecules and bulk matter. Surface phenomena also gain a greatly increased significance; even the well-known link between chemical reactivity and surface-to-volume ratio becomes a major determinant of physical properties, when it operates over nanoscale dimensions. Against this background, this comprehensive work is designed to address the need for a dynamic, authoritative and readily accessible source of information, capturing the full breadth of the subject. Its six volumes, covering a broad spectrum of disciplines including material sciences, chemistry, physics and life sciences, have been written and edited by an outstanding team of international experts. Addressing an extensive, cross-disciplinary audience, each chapter aims to cover key developments in a scholarly, readable and critical style, providing an indispensible first point of entry to the literature for scientists and technologists from interdisciplinary fields. The work focuses on the major classes of nanomaterials in terms of their synthesis, structure and applications, reviewing nanomaterials and their respective technologies in well-structured and comprehensive articles with extensive cross-references. It has been a constant surprise and delight to have found, amongst the rapidly escalating number who work in nanoscience and technology, so many highly esteemed authors willing to contribute. Sharing our anticipation of a major addition to the literature, they have also captured the excitement of the field itself in each carefully crafted chapter. Along with our painstaking and meticulous volume editors, full credit for the success of this enterprise must go to these individuals, together with our thanks for (largely) adhering to the given deadlines. Lastly, we record our sincere thanks and appreciation for the skills and professionalism of the numerous Elsevier staff who have been involved in this project, notably Fiona Geraghty, Megan Palmer and Greg Harris, and especially Donna De Weerd-Wilson who has steered it through from its inception. We have greatly enjoyed working with them all, as we have with each other.

Download or read book Advances in Molecular Nanotechnology Research and Application 2012 Edition written by and published by ScholarlyEditions. This book was released on 2012-12-26 with total page 2534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Molecular Nanotechnology Research and Application / 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Molecular Nanotechnology. The editors have built Advances in Molecular Nanotechnology Research and Application / 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Molecular Nanotechnology in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in Molecular Nanotechnology Research and Application / 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Download or read book Atomically Precise Metal Nanoclusters written by Thalappil Pradeep and published by Elsevier. This book was released on 2022-10-08 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomically Precise Metal Nanoclusters discusses the host of exciting properties that can be better harnessed with a solid understanding of their different structures and subsequent properties at the molecular level. The book delves into the foundational chemistry of numerous key atomically precise clusters and provides guidance on key approaches employed to examine them. Beginning with an introduction to the properties and fundamental nano-chemistry of atomically precise metal nanoclusters, the book then explores key approaches for their synthesis, examination and modification, including chromatography, mass spectrometry, single crystal diffraction, electron microscopy and computational approaches. A final section covers specific nanoclusters and cluster systems. User will find the important knowledge of an experienced team of contributors who provide a detailed guide to understanding, investigating and utilizing these useful structures that is ideal for anyone working in related fields. Presents a comprehensive guide that combines key knowledge, approaches and other types of metal nanocluster Supports an understanding of important interactions and approaches using clear figures Highlights future needs and prospects in the field

Download or read book MEMS written by Mohamed Gad-el-Hak and published by CRC Press. This book was released on 2005-11-29 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thoroughly revised and updated, the new edition of the best-selling MEMS Handbook is now presented as a three-volume set that offers state-of-the-art coverage of microelectromechanical systems. Through chapters contributed by top experts and pioneers in the field, MEMS: Design and Fabrication presents a comprehensive look at the materials, procedures, tools, and techniques of MEMS fabrication. New chapters in this edition examine the materials and fabrication of polymer microsystems and optical diagnostics for investigating the entrance length in microchannels. Rigorous yet accessible, this volume provides the practical knowledge needed for work in cutting-edge MEMS applications.

Download or read book Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society written by IEEE Engineering in Medicine and Biology Society. Annual Conference and published by . This book was released on 1991 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 2D Materials for Nanophotonics written by Young Min Jhon and published by Elsevier. This book was released on 2020-11-29 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Materials for Nanophotonics presents a detailed overview of the applications of 2D materials for nanophotonics, covering the photonic properties of a range of 2D materials including graphene, 2D phosphorene and MXenes, and discussing applications in lighting and energy storage. This comprehensive reference is ideal for readers seeking a detailed and critical analysis of how 2D materials are being used for a range of photonic and optical applications. Outlines the major photonic properties in a variety of 2D materials Demonstrates major applications in lighting and energy storage Explores the challenges of using 2D materials in photonics

Download or read book Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society Biophysical and biochemical measurements Sensors lasers and electrooptics Molecular electronics Instrumentation Critical care monitoring Rehabilitation engineering Speech hearing and vision aids written by IEEE Engineering in Medicine and Biology Society. Conference and published by . This book was released on 1991 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structures and Dynamics of Interfacial Water written by Duanyun Cao and published by Springer Nature. This book was released on 2023-03-14 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis highlights the study into the structures and dynamics of interfacial water, which is a cutting edge issue in condensed matter physics. Using the first principles calculation, classical molecular dynamics simulation and the simulation of atomic force microscopy (AFM), combined with the experimental results of AFM, the book systematically studies interfacial water at the atomic scale, especially the structure and growth mechanism of two-dimensional ice on hydrophobic Au (111) surface, the structure and the interconversion of the Eigen/Zundel hydrated proton on the Au(111) and Pt(111) surfaces, the microstructure and the hydration effect of the diffusion of ion hydrates on NaCl surface. This book displays the atomic scale information about the interaction between water and surface, and achieves many innovative results. Furthermore, the research methods included in this book can be further extended to study the more complex interfacial systems.