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Raman Fingerprints Of Atomically Precise Graphene Nanoribbons
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Book Synopsis Raman Fingerprints of Atomically Precise Graphene Nanoribbons by :
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.
Book Synopsis Metrology and Diagnostic Techniques for Nanoelectronics by : Zhiyong Ma
Download or read book Metrology and Diagnostic Techniques for Nanoelectronics written by Zhiyong Ma and published by CRC Press. This book was released on 2017-03-27 with total page 1454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoelectronics is changing the way the world communicates, and is transforming our daily lives. Continuing Moore’s law and miniaturization of low-power semiconductor chips with ever-increasing functionality have been relentlessly driving R&D of new devices, materials, and process capabilities to meet performance, power, and cost requirements. This book covers up-to-date advances in research and industry practices in nanometrology, critical for continuing technology scaling and product innovation. It holistically approaches the subject matter and addresses emerging and important topics in semiconductor R&D and manufacturing. It is a complete guide for metrology and diagnostic techniques essential for process technology, electronics packaging, and product development and debugging—a unique approach compared to other books. The authors are from academia, government labs, and industry and have vast experience and expertise in the topics presented. The book is intended for all those involved in IC manufacturing and nanoelectronics and for those studying nanoelectronics process and assembly technologies or working in device testing, characterization, and diagnostic techniques.
Download or read book Ladder Polymers written by Yan Xia and published by John Wiley & Sons. This book was released on 2023-05-30 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ladder Polymers An essential reference covering the latest research on ladder polymers Ladder polymers are a unique macromolecular architecture, consisting of a continuous strand of fused rings in their backbones. Such distinctive structures lead to a range of interesting thermal, optical, and electronic properties and self-assembly behaviors, which have been explored for various applications. The book Ladder Polymers: Synthesis, Properties, Applications, and Perspectives presents a collection of diverse topics in ladder polymers consisting of historical overview, state-of-the-art research and development, and potential future directions, written by leading researchers in the related fields. The topics include: Conjugated ladder polymers and graphene nanoribbons Nonconjugated microporous ladder polymers or polymers of intrinsic microporosity Covalent double-stranded polymers Supramolecular double-helical polymers and oligomers Two dimensional polymers This book is a one-stop resource on all the critical research developments in the subject of ladder polymers for broad readership including organic, polymer, and physical chemists, materials scientists and engineers, and chemical engineers.
Book Synopsis Advances in Coatings Deposition and Characterization by : MDPI
Download or read book Advances in Coatings Deposition and Characterization written by MDPI and published by MDPI. This book was released on 2020-12-29 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coatings offer the unique opportunity to create architectures that combine the functionality of two or more materials, conferring unique properties to objects with an extremely large palette of solutions. For this flexibility, thick and thin films have terrific impacts on the most relevant societal challenges. Computers, food packaging, airplanes, and cars, to mention a few familiar objects from everyday life, rely heavily on coatings. To celebrate the key role that coatings have in society, and in science and technology, this book collects a selection of relevant reviews and original research articles published in “Coatings” in 2017 and 2018. Papers have been selected based on their broad impact and balancing between the two major aspects of coatings science and technology: deposition and characterization.
Book Synopsis Carbon-related Materials in Recognition of Nobel Lectures by Prof. Akira Suzuki in ICCE by : Satoru Kaneko
Download or read book Carbon-related Materials in Recognition of Nobel Lectures by Prof. Akira Suzuki in ICCE written by Satoru Kaneko and published by Springer. This book was released on 2017-09-08 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the recent advances in carbon-related materials. It covers both experimental and theoretical approaches in graphene and nanocarbon materials, carbon composites and thin films, organic synthesis and physical chemistry, and characterization tools. Also discussed are cutting-edge applications for use in biochemical assays, dental implant surface modifi cations, pressure sensors, and more. This book is published in recognition of the Nobel Lectures delivered by Akira Suzuki, Emeritus Professor of Hokkaido University and Nobel Prize winner in Chemistry, 2010.
Book Synopsis Electronic Properties of Atomically Precise Graphene Nanoribbons by :
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:
Book Synopsis Engineering the Electronic Structure of Atomically-precise Graphene Nanoribbons by : Giang Duc Nguyen
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.
Book Synopsis Optical Spectroscopy and Applications of Atomically Precise Graphene Nanoribbons: from Light Emission to Photodetection by : Seyed Khalil Alavi Eshkaftaki
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:
Book Synopsis Theoretical Studies of the Growth, Stability and Applications of Atomically Precise Graphene Nanoribbons by : Zhongcan Xiao
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:
Book Synopsis Atomically Precise Graphene Nanoribbons by : Mikhail Shekhirev
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.
Book Synopsis Solution-Based Synthesis of Atomically Precise Graphene Nanoribbons by : Timothy Hoan Vo
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.
Book Synopsis On-Surface Characterization of Atomically Precise Graphene Nanoribbons by : Jacob D. Teeter
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.
Book Synopsis Ultrafast Terahertz Microscopy of Atomically Precise Graphene Nanoribbons by : Spencer E. Ammerman
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.
Book Synopsis Scanning Tunneling Microscopy Investigation of Atomically Precise Graphene Nanoribbons by : Adrian Radocea
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:
Book Synopsis On-Surface Synthesis II by : Dimas G. de Oteyza
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
Book Synopsis Scanning Tunneling Microscopy Characterization and Metallic Nanocontacts for Atomically Precise Graphene Nanoribbons by : Ximeng Liu
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:
Book Synopsis Carbon Nanotubes by : Stephanie Reich
Download or read book Carbon Nanotubes written by Stephanie Reich and published by John Wiley & Sons. This book was released on 2008-09-26 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes are exceptionally interesting from a fundamental research point of view. Many concepts of one-dimensional physics have been verified experimentally such as electron and phonon confinement or the one-dimensional singularities in the density of states; other 1D signatures are still under debate, such as Luttinger-liquid behavior. Carbon nanotubes are chemically stable, mechanically very strong, and conduct electricity. For this reason, they open up new perspectives for various applications, such as nano-transistors in circuits, field-emission displays, artificial muscles, or added reinforcements in alloys. This text is an introduction to the physical concepts needed for investigating carbon nanotubes and other one-dimensional solid-state systems. Written for a wide scientific readership, each chapter consists of an instructive approach to the topic and sustainable ideas for solutions. The former is generally comprehensible for physicists and chemists, while the latter enable the reader to work towards the state of the art in that area. The book gives for the first time a combined theoretical and experimental description of topics like luminescence of carbon nanotubes, Raman scattering, or transport measurements. The theoretical concepts discussed range from the tight-binding approximation, which can be followed by pencil and paper, to first-principles simulations. We emphasize a comprehensive theoretical and experimental understanding of carbon nanotubes including - general concepts for one-dimensional systems - an introduction to the symmetry of nanotubes - textbook models of nanotubes as narrow cylinders - a combination of ab-initio calculations and experiments - luminescence excitation spectroscopy linked to Raman spectroscopy - an introduction to the 1D-transport properties of nanotubes - effects of bundling on the electronic and vibrational properties and - resonance Raman scattering in nanotubes.
