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Author :
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (915 download)
Download or read book Electronic Properties of Atomically Precise Graphene Nanoribbons written by and published by . This book was released on 2015 with total page 132 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 : 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 : Mikhail Shekhirev
Publisher :
ISBN 13 : 9780355513387
Total Pages : 0 pages
Book Rating : 4.5/5 (133 download)
Download or read book Atomically Precise Graphene Nanoribbons written by Mikhail Shekhirev and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, in Chapter 5 I summarize the results of this work and discuss directions for future research in the framework of this project.
Author : Timothy Hoan Vo
Publisher :
ISBN 13 : 9781321700619
Total Pages : 202 pages
Book Rating : 4.7/5 (6 download)
Download or read book Solution-Based Synthesis of Atomically Precise Graphene Nanoribbons written by Timothy Hoan Vo and published by . This book was released on 2015 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronic properties of GNRs could be further tuned via their doping with heteroatoms, such as boron or nitrogen. This possibility has been extensively studied theoretically, but only a few experimental attempts to synthesize nitrogen-doped GNRs (N-GNRs) by bottom-up approaches have been reported. We demonstrate that the same approach based on Yamamoto coupling of molecular precursors containing nitrogen atoms followed by cyclodehydrogenation via Scholl reaction can be used for the synthesis of high-quality N-GNRs as well.
Author : Rongchao Jin
Publisher : John Wiley & Sons
ISBN 13 : 111978865X
Total Pages : 533 pages
Book Rating : 4.1/5 (197 download)
Download or read book Atomically Precise Nanochemistry written by Rongchao Jin and published by John Wiley & Sons. This book was released on 2023-03-28 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomically Precise Nanochemistry Explore recent progress and developments in atomically precise nanochemistry Chemists have long been motivated to create atomically precise nanoclusters, not only for addressing some fundamental issues that were not possible to tackle with imprecise nanoparticles, but also to provide new opportunities for applications such as catalysis, optics, and biomedicine. In Atomically Precise Nanochemistry, a team of distinguished researchers delivers a state-of-the-art reference for researchers and industry professionals working in the fields of nanoscience and cluster science, in disciplines ranging from chemistry to physics, biology, materials science, and engineering. A variety of different nanoclusters are covered, including metal nanoclusters, semiconductor nanoclusters, metal-oxo systems, large-sized organometallic nano-architectures, carbon clusters, and supramolecular architectures. The book contains not only experimental contributions, but also theoretical insights into the atomic and electronic structures, as well as the catalytic mechanisms. The authors explore synthesis, structure, geometry, bonding, and applications of each type of nanocluster. Perfect for researchers working in nanoscience, nanotechnology, and materials chemistry, Atomically Precise Nanochemistry will also benefit industry professionals in these sectors seeking a practical and up-to-date resource.
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 :
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (982 download)
Download or read book Raman Fingerprints of Atomically Precise Graphene Nanoribbons written by and published by . This book was released on 2016 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bottom-up approaches allow the production of ultranarrow and atomically precise graphene nanoribbons (GNRs) with electronic and optical properties controlled by the specific atomic structure. Combining Raman spectroscopy and ab initio simulations, we show that GNR width, edge geometry, and functional groups all influence their Raman spectra. As a result, the low-energy spectral region below 1000 cm-1 is particularly sensitive to edge morphology and functionalization, while the D peak dispersion can be used to uniquely fingerprint the presence of GNRs and differentiates them from other sp2 carbon nanostructures.
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 : Seyed Khalil Alavi Eshkaftaki
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (123 download)
Download or read book Optical Spectroscopy and Applications of Atomically Precise Graphene Nanoribbons: from Light Emission to Photodetection written by Seyed Khalil Alavi Eshkaftaki and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : 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 : 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.
Download or read book Interplay of Relativistic and Nonrelativistic Transport in Atomically Precise Segmented Graphene Nanoribbons written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene's isolation launched explorations of fundamental relativistic physics originating from the planar honeycomb lattice arrangement of the carbon atoms, and of potential technological applications in nanoscale electronics. Bottom-up fabricated atomically-precise segmented graphene nanoribbons, SGNRs, open avenues for studies of electrical transport, coherence, and interference effects in metallic, semiconducting, and mixed GNRs, with different edge terminations. Conceptual and practical understanding of electric transport through SGNRs is gained through nonequilibrium Green's function (NEGF) conductance calculations and a Dirac continuum model that absorbs the valence-to-conductance energy gaps as position-dependent masses, including topological-in-origin mass-barriers at the contacts between segments. The continuum model reproduces the NEGF results, including optical Dirac Fabry-Pérot (FP) equidistant oscillations for massless relativistic carriers in metallic armchair SGNRs, and an unequally-spaced FP pattern for mixed armchair-zigzag SGNRs where carriers transit from a relativistic (armchair) to a nonrelativistic (zigzag) regime. This provides a unifying framework for analysis of coherent transport phenomena and interpretation of forthcoming experiments in SGNRs.
Author : G. Beamson
Publisher : Wiley
ISBN 13 : 9780471935926
Total Pages : 306 pages
Book Rating : 4.9/5 (359 download)
Download or read book High Resolution XPS of Organic Polymers written by G. Beamson and published by Wiley. This book was released on 1992-11-17 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Definitive handbook of high resolution xps spectra of over one hundred organic polymers. Provides the full spectral information--survey and core regions (with fitted components), shake-up spectra, valence band and, in some cases, Auger spectra. All the data are parameterized and tabulated. Complete details of sample preparation are given. Instrument performance and operating conditions are extensively documented. Complete with introductory section and comprehensive appendices. Easy-to-use landscape format.
Author : Dimas G. de Oteyza
Publisher : Springer
ISBN 13 : 3319758101
Total Pages : 231 pages
Book Rating : 4.3/5 (197 download)
Download or read book On-Surface Synthesis II written by Dimas G. de Oteyza and published by Springer. This book was released on 2018-03-19 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: On-surface synthesis is appearing as an extremely promising strategy to create organic nanoarchitectures with atomic precision. Molecular building blocks holding adequate functional groups are dosed onto surfaces that support or even drive their covalent linkage. The surface confinement and the frequent lack of solvents (most commonly being performed under vacuum conditions) create a completely new scenario fully complementary to conventional chemistry. In a pedagogical way and based on the most recent developments, this volume presents our current understanding in the field, addressing fundamental reaction mechanisms, synthetic strategies to influence the reactions according to our needs, as well as the ultimate growth and characterization of functional materials. Verging on chemistry, physics and materials science, the book is aimed at students and researchers interested in nanochemistry, surface science, supramolecular materials and molecular devices. Chapters "Mechanistic insights into surface-supported chemical reactions", "Reactivity on and of Graphene Layers: Scanning Probe Microscopy Reviels" and "Bottom-up fabrication of atomically precise graphene nanoribbons" of this book are available open access under a CC BY 4.0 license at link.springer.com
Author : R. Rigler
Publisher : Springer Science & Business Media
ISBN 13 : 3642565441
Total Pages : 375 pages
Book Rating : 4.6/5 (425 download)
Download or read book Single Molecule Spectroscopy written by R. Rigler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topics range from single molecule experiments in quantum optics and solid-state physics to analogous investigations in physical chemistry and biophysics.
