Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Scanning Tunneling Microscopy Investigation Of Atomically Precise Graphene Nanoribbons full books in PDF, epub, and Kindle. Read online Scanning Tunneling Microscopy Investigation Of Atomically Precise Graphene Nanoribbons ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Adrian Radocea
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)
Download or read book Scanning Tunneling Microscopy Investigation of Atomically Precise Graphene Nanoribbons written by Adrian Radocea and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Spencer E. Ammerman
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.3/5 (684 download)
Download or read book Ultrafast Terahertz Microscopy of Atomically Precise Graphene Nanoribbons written by Spencer E. Ammerman and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent developments in bottom-up synthesis of atomically precise graphene nanoribbons (GNRs) are paving the way for new technologies with angstrom-scale features that host a myriad of electronic, spin, and topological properties. Studying the ultrafast phenomena relevant to the optoelectronic potential of these GNRs requires extreme spatio-temporal resolution. Conventional techniques for atomic-scale investigation of materials, such as scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), lack the necessary time resolution to investigate ultrafast dynamics. Meanwhile, conventional ultrafast measurements are able to time-resolve the optical excitations of these GNRs, but, they lack the requisite spatial resolution to perform more precise experiments on isolated individual structures. Instead, they act on ensembles and average over many GNR lengths, orientations, and sample qualities.With the development of terahertz scanning tunneling microscopy (THz-STM), coherent control of tunneling electrons on sub-picosecond timescales is now possible in an STM tunnel junction. However, to fully empower THz-STM as a scientific tool for materials science, an approach to characterize the electronic properties of new materials and nanostructures without prior knowledge of the sample response is needed. This demands the establishment of terahertz scanning tunneling spectroscopy (THz-STS) with atomic spatial resolution and an approach to analyzing such measurements.In this thesis, we demonstrate atomic-scale THz-STS for the first time by extracting the differential conductance (dI/dV) from a model GNR system with angstrom-scale resolution in all three spatial dimensions. We utilize bottom-up synthesis to construct atomically precise 7-atom-wide armchair graphene nanoribbons (7-AGNR) on an Au(111) substrate. THz-STM is applied to probe the electronic structure of a 7-AGNR while operating at ultralow tip heights, where the distance between STM tip and GNR is reduced by ~3.0-4.0 A. compared to conventional STM tip heights. We construct a model of the GNR electronic density of states and apply THz-STS to a collection of THz-STM images taken at different incident THz field strengths to construct dI/dV maps of the frontier orbitals on a 7-AGNR segment. Lastly, a set of time-domain measurements are performed in the hopes of observing dynamical effects associated with charging of the GNR during charge injection by the THz-STM. The aforementioned steady-state THz-STS results are sufficient to describe the time-domain measurements without charging, suggesting further sample preparation is needed to decouple the GNR from the Au(111) surface and reveal transient effects.We further develop and test an algorithm, based on a polynomial representation of the junction I-V curve, for extracting the tunnel junction dI/dV accessed by an ultrafast THz-STM probe in both steady-state and optical-pump/THz-STS-probe experiments. We test our algorithm against a set of model systems constructed to represent typical STM samples, e.g., metals, semiconductors, and molecules. Then, we simulate a THz-STS experiment wherein we address systematic error by defining a procedure to determine the algorithm parameters. After setting the stage with steady-state THz-STS, our algorithm is expanded upon, and we show how a dynamic junction I(V) predicted for an optical-pump/THz-STM-probe experiment can be extracted from THz-STS measurements. By applying the cross-correlation theorem in the frequency domain we find that the time-resolution of THz-STS is not limited to the input bandwidth of the ultrafast THz voltage pulse. As a result, our pump-probe THz-STS algorithm reveals dynamics faster than a single oscillation cycle of the THz transient,and in the future may be combined with atomically resolved THz-STS experiments to bridge a new frontier of ultrafast materials science.
Author : Ximeng Liu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)
Download or read book Scanning Tunneling Microscopy Characterization and Metallic Nanocontacts for Atomically Precise Graphene Nanoribbons written by Ximeng Liu and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Giang Duc Nguyen
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.:/5 (18 download)
Download or read book Engineering the Electronic Structure of Atomically-precise Graphene Nanoribbons written by Giang Duc Nguyen and published by . This book was released on 2006 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene nanoribbons (GNRs) have recently attracted great interest because of their novel electronic and magnetic properties, as well as their significant potential for device applications. Although several top-down techniques exist for fabricating GNRs, only bottom-up synthesis of GNRs from molecular precursors yields nanoribbons with atomic-scale structural control. Furthermore, precise incorporation of dopant species into GNRs, which is possible with bottom-up synthesis, is a potentially powerful way to control the electronic structure of GNRs. However, it is not well understood how these dopants affect the electronic structure of GNRs. Are these effects dependent on the dopant site? Can the band gap be tuned by doping? This dissertation helps to answer these questions through studying the electronic structure of bottom-up grown GNRs with controlled atomic dopants. The effects of edge and interior doping with different atomic species such as sulfur, boron and ketone were investigated and showed significant site dependence. Topographic and local electronic structure characterization was performed via scanning tunneling microscopy & spectroscopy (STM & STS) and compared to first-principle calculations. The chemical structure of GNRs and GNR heterojunctions was characterized by CO-tip-functionalized non-contact atomic force microscopy (nc-AFM) as well as by a newly developed technique of bond-resolved STM (BRSTM). In an effort to develop a new method for directly synthesizing GNRs on an insulating substrate, we also studied light-induced photo-isomerization of azobenzene molecules adsorbed on an insulating surface of CVD-grown monolayer boron nitride (BN) on Cu(111). This study provides important insights into molecular behavior on an insulating surface, how to couple light to an STM system, and how to utilize local field enhancement effects due to surface plasmon resonance.
Author : Mengxi Liu
Publisher : Springer
ISBN 13 : 981105181X
Total Pages : 106 pages
Book Rating : 4.8/5 (11 download)
Download or read book Controlled Synthesis and Scanning Tunneling Microscopy Study of Graphene and Graphene-Based Heterostructures written by Mengxi Liu and published by Springer. This book was released on 2017-10-10 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the energy band engineering of graphene. It presents pioneering findings on the controlled growth of graphene and graphene-based heterostructures, as well as scanning tunneling microscopy/scanning tunneling spectroscopy (STM/STS) studies on their electronic structures. The thesis primarily investigates two classes of graphene-based systems: (i) twisted bilayer graphene, which was synthesized on Rh substrates and manifests van Hove singularities near Fermi Level, and (ii) in-plane h-BN-G heterostructures, which were controllably synthesized in an ultrahigh vacuum chamber and demonstrate intriguing electronic properties on the interface. In short, the thesis offers revealing insights into the energy band engineering of graphene-based nanomaterials, which will greatly facilitate future graphene applications.
Author : Klaus Muellen
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110381621
Total Pages : 380 pages
Book Rating : 4.1/5 (13 download)
Download or read book Chemistry of Carbon Nanostructures written by Klaus Muellen and published by Walter de Gruyter GmbH & Co KG. This book was released on 2017-06-12 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemistry of Carbon Nanostructures aims to present the current state-of-the-art synthesis and application of carbon materials like nano diamonds, ribbons and graphene-like structures in science and engineering. Edited by Professor Klaus Müllen, who received the Adolf von Bayer Medal for his contribution to Carbon Chemistry, and Xinliang Feng, this book combines outstanding contributions by a renowned international team of experts. The authors discuss chemical aspects of carbon nanostructures, their synthesis, functionalization and design strategies for defi ned applications. Recent advances in carbon nanomembranes, molecule-assisted ultrasound-induced liquid-phase exfoliation of graphene, and solution synthesis of graphene nanoribbons and biological application of nanodiamonds are highlighted topics. This book provides an excellent reference on the chemistry of carbon nanostructures for Chemists, Materials Scientists, Condensed-matter Physicists, Surface Scientists, and Engineers.
Author : Mario Rocca
Publisher : Springer Nature
ISBN 13 : 3030469069
Total Pages : 1273 pages
Book Rating : 4.0/5 (34 download)
Download or read book Springer Handbook of Surface Science written by Mario Rocca and published by Springer Nature. This book was released on 2021-01-14 with total page 1273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook delivers an up-to-date, comprehensive and authoritative coverage of the broad field of surface science, encompassing a range of important materials such metals, semiconductors, insulators, ultrathin films and supported nanoobjects. Over 100 experts from all branches of experiment and theory review in 39 chapters all major aspects of solid-state surfaces, from basic principles to applications, including the latest, ground-breaking research results. Beginning with the fundamental background of kinetics and thermodynamics at surfaces, the handbook leads the reader through the basics of crystallographic structures and electronic properties, to the advanced topics at the forefront of current research. These include but are not limited to novel applications in nanoelectronics, nanomechanical devices, plasmonics, carbon films, catalysis, and biology. The handbook is an ideal reference guide and instructional aid for a wide range of physicists, chemists, materials scientists and engineers active throughout academic and industrial research.
Author : Kaitlyn Ann Parsons
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)
Download or read book Scanning Tunneling Microscopy and Spectroscopy of Wet Chemical Synthesized Porous Graphene Nanoribbons in Ultra-high Vacuum written by Kaitlyn Ann Parsons and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jacob D. Teeter
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.5/5 (57 download)
Download or read book On-Surface Characterization of Atomically Precise Graphene Nanoribbons written by Jacob D. Teeter and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene-based materials have been the focus of intense research in recent years, and owing to the desirable properties they possess, the variety of potential applications for them is likewise impressive. Chapter 1 discusses graphene nanoribbons (GNRs) and how their precise atomic features exhibit critical influence over electronic characteristics such as band gaps, magnetic edge states, and topological phases. One can therefore engage in design of molecular precursors to build atomically precise GNRs from the bottom up with desired features which can be probed with surface science techniques. These elements include ribbon width, edge geometry, heteroatomic doping, and many more. In this dissertation are results of scanning probe microscopy experiments to examine structural and electronic characteristics of several GNR structures derived from surface-assisted synthesis techniques.First, we studied the growth of chevron GNRs on Cu(111) (Chapter 2). Epitaxial growth of chevron polymers and GNRs at low temperatures arose out of the strong interactions between structure and surface.In Chapter 3 we discuss the development of an alternative deposition technique, direct contact transfer (DCT). It arose as an analogue of dry contact transfer for solution-synthesized GNRs. The procedure was demonstrated for two precursors, and the intermediates observed in the process of annealing were determined by DFT to be stabilized by Ï0-Ï0 interactions.Chapter 4 covers the on-surface synthesis of laterally extended chevron GNRs (eGNRs). By slight modification of the chevron precursor structure, the band gap of the GNRs was reduced in accordance with established theory. In Chapter 5 results are presented on the on-surface synthesis of intrinsically porous chevron-derived GNRs. These GNRs featured electronic states at their pores as well as reduced band gaps relative to chevron GNRs.Chapter 6 details work on the growth of GNRs from a precursor with two centers of rotation and the potential for influencing its self-assembly.Finally, Chapter 7 contains a summary of the work performed as well as directions to be explored in the future as relate to this project.
Author : Kevin Tianyi He
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (636 download)
Download or read book Atomic-scale Studies of Nanometer-sized Graphene Using Scanning Tunneling Microscopy on III-V Semiconductor Surfaces written by Kevin Tianyi He and published by . This book was released on 2009 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yen-Chia Chen
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (957 download)
Download or read book Exploring Graphene Nanoribbons Using Scanning Probe Microscopy and Spectroscopy written by Yen-Chia Chen and published by . This book was released on 2014 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene nanoribbons (GNRs) are strips of graphene, featuring narrow widths at the nanometer scale. A GNR may be considered as a structure cut out of graphene, which is a two dimensional honeycomb lattice of sp2 carbon atoms. Cutting graphene in different ways may be understood as imposing different boundary conditions on graphene, and therefore the electronic structures of GNRs are dependent on their geometries. Fascinating properties of graphene nanoribbons ranging from width-dependent semiconducting energy gaps to localized edge magnetization are predicted in theory. These properties, together with their ultra-thin nature, give GNRs great potential in future electronic applications. This dissertation focuses on the fundamental relations between the geometry and the electronic structure of GNRs, and explores bottom-up strategies to synthesize GNRs via molecular self-assembly. Using scanning tunneling microscopy (STM) and spectrocopy (STS), chiral and ultra-narrow armchair GNRs and width-modulated GNR heterojunctions were studied. The localized edge states in chiral GNRs derived from unzipping carbon nanotubes were explored and evidence is shown that these states are spin-polarized. We further modified the chiral GNR edges with hydrogen plasma, and determined both the terminal hydrogen-bonding structure and the edge electronic structure by combining STM and ab initio simulation. Bandgap tuning of bottom-up synthesized armchair GNRs was demonstrated via development of a new molecular building block. We find that the energy gap of wider N = 13 armchair GNRs is 1.4 ± 0.1 eV, 1.2 eV smaller than the bandgap of a narrower N = 7 armchair GNR. In addition, width-modulated GNR heterojunctions were obtained by fusing segments of two different molecular building blocks, and were characterized to possess electronic structure similar to type I semiconductor junctions. As an effort to develop an alternative route toward synthesis of GNRs, we imaged and studied single-molecule enediyne chemical reactions on metallic surfaces with non-contact atomic force microscopy (nc-AFM). This bond-resolved imaging technique allows us to extract an unparalleled insight into the chemistry involved in complex enediyne cyclization cascades on surfaces.
Author : Viera Skakalova
Publisher : Woodhead Publishing
ISBN 13 : 0081028490
Total Pages : 544 pages
Book Rating : 4.0/5 (81 download)
Download or read book Graphene written by Viera Skakalova and published by Woodhead Publishing. This book was released on 2021-06-23 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene: Properties, Preparation, Characterization and Devices, Second Edition, provides a comprehensive look at the methods used to prepare and analyze graphene. Since the first edition’s publication, there have been many advances in the understanding of graphene, in particular, its key properties and most relevant applications. Updates to this new edition include chapters on liquid exfoliation production of graphene and scanning transmission electron microscopy of graphene. New sections cover graphene's thermal, optical, mechanical, chemical and biocompatibility, with special attention paid to transport properties, a main barrier to the realization of commercial applications. Reviews the preparation and characterization of graphene, covering the latest advances in liquid exfoliation production and the scanning transmission electron microscopy of graphene Includes a new section dedicated to the properties of graphene (thermal, transport, optical, mechanical, chemical) to reflect the latest understanding of this important material Discusses the most relevant applications of graphene, such as biomedical, sensing, energy and electronic applications
Author : Toshiaki Enoki
Publisher : CRC Press
ISBN 13 : 0429662793
Total Pages : 348 pages
Book Rating : 4.4/5 (296 download)
Download or read book Physics and Chemistry of Graphene (Second Edition) written by Toshiaki Enoki and published by CRC Press. This book was released on 2019-11-01 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene has been attracting growing attentions in physics, chemistry, and device applications after the discovery of micromechanically cleaved graphene sheet by A. Geim and K. Novoselov, who were awarded the 2010 Nobel Prize in Physics. The electronic structure of graphene, which is described in terms of massless Dirac fermions, brings about unconventional electronic properties, which are not only an important basic issue in condensed matter physics but also a promising target of cutting-edge electronics/spintronics device applications. Meanwhile, from chemistry aspect, graphene is the extreme of condensed polycyclic hydrocarbon molecules extrapolated to infinite size. Here, the concept on aromaticity, which organic chemists utilize, is applicable. Interesting issues appearing between physics and chemistry are pronounced in nanosized graphene (nanographene), as we recognize the importance of the shape of nanographene in understanding its electronic structure. This book comprehensively discusses the fundamental issues related to the electronic, magnetic, and chemical properties of condensed polycyclic hyodrocarbon molecules, nanographene, and graphene.
Author :
Publisher : Academic Press
ISBN 13 : 012812296X
Total Pages : 1881 pages
Book Rating : 4.1/5 (281 download)
Download or read book Comprehensive Nanoscience and Nanotechnology written by and published by Academic Press. This book was released on 2019-01-02 with total page 1881 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Nanoscience and Technology, Second Edition, Five Volume Set allows researchers to navigate a very diverse, interdisciplinary and rapidly-changing field with up-to-date, comprehensive and authoritative coverage of every aspect of modern nanoscience and nanotechnology. Presents new chapters on the latest developments in the field Covers topics not discussed to this degree of detail in other works, such as biological devices and applications of nanotechnology Compiled and written by top international authorities in the field
Author :
Publisher : Elsevier
ISBN 13 : 0080963560
Total Pages : 168 pages
Book Rating : 4.0/5 (89 download)
Download or read book Atomic and Molecular Manipulation written by and published by Elsevier. This book was released on 2011-07-13 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Work with individual atoms and molecules aims to demonstrate that miniaturized electronic, optical, magnetic, and mechanical devices can operate ultimately even at the level of a single atom or molecule. As such, atomic and molecular manipulation has played an emblematic role in the development of the field of nanoscience. New methods based on the use of the scanning tunnelling microscope (STM) have been developed to characterize and manipulate all the degrees of freedom of individual atoms and molecules with an unprecedented precision. In the meantime, new concepts have emerged to design molecules and substrates having specific optical, mechanical and electronic functions, thus opening the way to the fabrication of real nano-machines. Manipulation of individual atoms and molecules has also opened up completely new areas of research and knowledge, raising fundamental questions of "Optics at the atomic scale", "Mechanics at the atomic scale", Electronics at the atomic scale", "Quantum physics at the atomic scale", and "Chemistry at the atomic scale". This book aims to illustrate the main aspects of this ongoing scientific adventure and to anticipate the major challenges for the future in "Atomic and molecular manipulation" from fundamental knowledge to the fabrication of atomic-scale devices. Provides a broad overview of the field to aid those new and entering into this research area Presents a review of the historical development and evolution of the field Offers a clear personalized view of current scanning probe microscopy research from world experts
Author : Zhongcan Xiao
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (11 download)
Download or read book Theoretical Studies of the Growth, Stability and Applications of Atomically Precise Graphene Nanoribbons written by Zhongcan Xiao and published by . This book was released on 2019 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Sumesh
Publisher : Springer Nature
ISBN 13 : 3031498267
Total Pages : 234 pages
Book Rating : 4.0/5 (314 download)
Download or read book 2nd International Conference on Smart Sustainable Materials and Technologies (ICSSMT 2023) written by M. Sumesh and published by Springer Nature. This book was released on with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
