Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Ultrafast Spectroscopy Of Single Chirality Single Walled Carbon Nanotubes
Download Ultrafast Spectroscopy Of Single Chirality Single Walled Carbon Nanotubes full books in PDF, epub, and Kindle. Read online Ultrafast Spectroscopy Of Single Chirality Single Walled Carbon Nanotubes ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Ultrafast Spectroscopy of Single-chirality Single-walled Carbon Nanotubes by : Shujing Wang
Download or read book Ultrafast Spectroscopy of Single-chirality Single-walled Carbon Nanotubes written by Shujing Wang and published by . This book was released on 2010 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Single-walled carbon nanotubes (SWNTs) are quasi-one-dimensional nanomaterials. There are a variety of SWNT structures defined by different diameter and chirality. The most recent progress in obtaining single-chirality enriched SWNT samples by using specific DNA sequences as the dispersing agent have promoted the fundamental study and practical application of nanotubes with identical structure. Femtosecond pump-probe transient absorption spectroscopy was performed to study the electronic and optical properties of single-chirality SWNTs. At the early decay time window (
Book Synopsis Ultrafast Nonlinear Optical Spectroscopy of Single-walled Carbon Nanotubes by : Libai Huang
Download or read book Ultrafast Nonlinear Optical Spectroscopy of Single-walled Carbon Nanotubes written by Libai Huang and published by . This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast Dynamics of Individual Air-suspended Single-walled Carbon Nanotube by : Tam Q. Nhan
Download or read book Ultrafast Dynamics of Individual Air-suspended Single-walled Carbon Nanotube written by Tam Q. Nhan and published by . This book was released on 2008 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thorough understanding of the electronic and optical properties of single-walled carbon nanotubes (SWCNTs) will no doubt benefit future technological applications. Since the discovery of band gap photoluminescence from isolated semiconducting SWCNTs, significant progresses in studying the optical properties of SWCNTs have been made (e.g. linear polarization along the tube axis for the absorption and emission of light, excitonic nature in SWCNT excitation). However, there are still several controversial parameters of SWCNTs (e.g. quantum efficiency, absorption cross section, radiative lifetime, and Auger recombination lifetime). With the advancement in SWCNT sample preparation, studies of SWCNT intrinsic properties have shifted from ensemble to a single tube level, in which the ambiguities in elucidating intrinsic properties posed by the assortment of different tube species can be minimized. By examining individual SWCNTs suspended in air, in contrast to micelle-encapsulated SWCNTs, we believe that the environmental effects can be reduced. This thesis will demonstrate the capability of doing spectroscopy on a single semiconducting air-suspended SWCNT. In continuous-wave excitation, the photoluminescence excitation map and high resolution photoluminescence (PL) image of a SWCNT can be constructed, and PL polarization is proven. Quantum efficiency of 5% is experimentally estimated for (9,8) and (10,8) chiral SWCNTs. Pulse excitation allows us to study the intrinsic exciton dynamics of a SWCNT. To gain insight into exciton nonlinear decay processes, PL saturation in pump power dependence measurement is investigated and compared to the simulated results from stochastic models of exciton dynamics. Femtosecond excitation correlation spectroscopy with 150 fs time resolution is employed to time-resolve the PL of a single tube suspended in air.
Book Synopsis Graphene and Carbon Nanotubes by : Ermin Malic
Download or read book Graphene and Carbon Nanotubes written by Ermin Malic and published by John Wiley & Sons. This book was released on 2013-04-12 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: A first on ultrafast phenomena in carbon nanostructures like graphene, the most promising candidate for revolutionizing information technology and communication The book introduces the reader into the ultrafast nanoworld of graphene and carbon nanotubes, including their microscopic tracks and unique optical finger prints. The author reviews the recent progress in this field by combining theoretical and experimental achievements. He offers a clear theoretical foundation by presenting transparently derived equations. Recent experimental breakthroughs are reviewed. By combining both theory and experiment as well as main results and detailed theoretical derivations, the book turns into an inevitable source for a wider audience from graduate students to researchers in physics, materials science, and electrical engineering who work on optoelectronic devices, renewable energies, or in the semiconductor industry.
Book Synopsis Ultrafast Pump Probe Spectroscopy of Single-wall Carbon Nanotubes by : Zipeng Zhu
Download or read book Ultrafast Pump Probe Spectroscopy of Single-wall Carbon Nanotubes written by Zipeng Zhu and published by . This book was released on 2008 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes by : Matthew Werden Graham
Download or read book Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes written by Matthew Werden Graham and published by . This book was released on 2010 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-walled carbon nanotubes (SWNTs) are often considered the prototypical nanomaterial with their characteristic large aspect ratios, high tensile strength and size tunable physical properties. While their remarkable electrical and mechanical properties have been well studied, the optical properties of semiconducting SWNTs are continuously emerging with recently reported developments such as greatly enhanced fluorescence yields and highly efficient nanotube photodiodes. The scope of optoelectronic applications for SWNTs depends critically on a detailed understanding of their highly congested absorption features consisting of strongly bound excitonic (E11, E22, etc.), vibronic and dark state transitions. Until recently, carbon nanotubes consisted of highly inhomogeneous distributions of tubes types that made advanced spectroscopic studies impractical. Enabled by samples highly enriched in specific tube types, we investigate carbon nanotubes photophysics in real-time by applying a wide range of techniques including transient absorption, photon echo and 2D Fourier transform spectroscopy. Through detailed analysis and simulation of these femtosecond nonlinear results, fundamental properties concerning excitonic structure, exciton-phonon interactions, and the dynamics of coherent excitons for these quasi one-dimensional nanomaterials are revealed. Population relaxation dynamics in SWNTs are probed from the visible to mid-infrared regions using transient absorption or grating spectroscopy. Measurements in mid-IR region reveal a broad excited state absorption feature consistent with previously unobserved intra-excitonic transitions and bound vibrational states. Simulation of visible and near-IR transient absorption results suggest efficient exciton-exciton annihilation occurring by both one-dimensional diffusion or delocalized overlap of coherent excitons depending upon the timescale, state transitions, or temperature investigated (4.4 to 292 K). Throughout all the measurements reported, strong contributions from exciton-exciton scattering processes are evident. The timescales for pure optical dephasing (and the corresponding homogeneous lineshape) were obtained through photon echo measurements. Surprisingly long room temperature dephasing times of 285 fs are reported, suggesting unusually weak exciton-phonon coupling and an inhomogeneously broadened absorption lineshape. At lower temperatures the dephasing induced by SWNT optical phonons is mitigated, and we show how acoustic phonon processes and environmental disorder determines the absorption line-shape properties.
Book Synopsis Photophysics of Chiral Enriched Single-walled Carbon Nanotubes by : Sajjad Hoseinkhani Asl
Download or read book Photophysics of Chiral Enriched Single-walled Carbon Nanotubes written by Sajjad Hoseinkhani Asl and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrashort Pulse Lasers and Ultrafast Phenomena by : Takayoshi Kobayashi
Download or read book Ultrashort Pulse Lasers and Ultrafast Phenomena written by Takayoshi Kobayashi and published by CRC Press. This book was released on 2023-03-21 with total page 1255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the basic physical principles of techniques to generate and ultrashort pulse lasers and applications to ultrafast spectroscopy of various materials covering chemical molecular compounds, solid-state materials, exotic novel materials including topological materials, biological molecules and bio- and synthetic polymers. It introduces non-linear optics which provides the basics of generation and measurement of pulses and application examples of ultrafast spectroscopy to solid state physics. Also it provide not only material properties but also material processing procedures. The book describes also details of the world shortest visible laser and DUV lasers developed by the author’s group. It is composed of the following 12 Sections: The special features of this book is that it is written by a single author with a few collaborators in a systematic way. Hence it provides a comprehensive and systematic description of the research field of ultrashort pulse lasers and ultrafast spectroscopy. Generation of ultrashort pulses in deep ultraviolet to near infrared Generation of ultrashort pulses in terahertz Carrier envelope phase (CEP) Simple NLO processes with a few colors Multi-color involved NLO processes Multi-color ultrashort pulse generation NLO materials NLO processes in time-resolved spectroscopy Low dimension materials Conductors and superconductors Chemical reactions and material processing Photobiological reactions
Book Synopsis Springer Handbook of Nanomaterials by : Robert Vajtai
Download or read book Springer Handbook of Nanomaterials written by Robert Vajtai and published by Springer Science & Business Media. This book was released on 2013-08-20 with total page 1234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Handbook of Nanomaterials covers the description of materials which have dimension on the "nanoscale". The description of the nanomaterials in this Handbook follows the thorough but concise explanation of the synergy of structure, properties, processing and applications of the given material. The Handbook mainly describes materials in their solid phase; exceptions might be e.g. small sized liquid aerosols or gas bubbles in liquids. The materials are organized by their dimensionality. Zero dimensional structures collect clusters, nanoparticles and quantum dots, one dimensional are nanowires and nanotubes, while two dimensional are represented by thin films and surfaces. The chapters in these larger topics are written on a specific materials and dimensionality combination, e.g. ceramic nanowires. Chapters are authored by well-established and well-known scientists of the particular field. They have measurable part of publications and an important role in establishing new knowledge of the particular field.
Book Synopsis Single-Walled Carbon Nanotubes by : Yan Li
Download or read book Single-Walled Carbon Nanotubes written by Yan Li and published by Springer. This book was released on 2019-05-16 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.
Book Synopsis Ultrafast 2D White-light Spectroscopy of Semiconducting Materials for Photovoltaics by : Jessica Flach
Download or read book Ultrafast 2D White-light Spectroscopy of Semiconducting Materials for Photovoltaics written by Jessica Flach and published by . This book was released on 2020 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes and perovskites have both shown immense promise as materials for next-generation photovoltaic devices. In this dissertation, I use ultrafast spectroscopy techniques to study the fundamental photophysics of these materials in order to further improve device performance. Our ultrafast transient absorption and two-dimensional white light spectroscopy (2DWL) techniques use a broadband supercontinuum spanning from the visible to NIR to collect information on femtosecond timescales. These techniques allow us to monitor the factors that influence photovoltaic device performance such as exciton lifetime, energy and charge transfer rates, and couplings between electronic states. The first part of this work focuses on studying the underlying photophysics of excitations in semiconducting single-walled carbon nanotubes (s-SWNTs). In the first study, the role of defects on exciton quenching in carbon nanotubes is examined using transient absorption and Raman spectroscopy. The results obtained in this study indicate that s-SWNT devices are defect-limited, implying that improvements in device efficiency can be obtained through the use of longer and more pristine s-SWNTs. We further expand on the understanding of defect-limited dynamics in carbon nanotubes by studying energy transfer kinetics in mixed-chirality films of carbon nanotubes of varying lengths and defect densities. The spectroscopic results presented in this study show that energy transfers more efficiently between longer and less defective nanotubes. The spectroscopic results collected in these studies link energy transfer to exciton diffusion lengths and lifetimes, and correlate to observed device performances. In addition to carbon nanotubes, I also present photovoltaic device performance results and 2DWL studies of mixed-cation lead halide perovskites. Complex perovskite compositions containing mixtures of cations and halides comprise the highest efficiency devices to date, yet the fundamental photophysics of these materials are still scarcely studied and understood. The 2DWL studies presented here seek to understand the role of cations on the ultrafast dynamics in these mixed-cation perovskite structures. Finally, I present preliminary data on a wrinkled heterojunction architecture for carbon nanotubes devices. This new architecture was inspired by the ultrafast spectroscopic results showing that the transverse exciton diffusion length is a limiting factor in device performance. A bilayer of carbon nanotubes and an electron-accepting material is deposited on an elastic substrate and allowed to wrinkle on itself, creating a bulk-like heterojunction architecture with high interfacial area between the donor and acceptor to drive exciton dissociation.
Book Synopsis Spectroscopy of Individual Single-Walled Carbon Nanotubes by : Oliver Kiowski
Download or read book Spectroscopy of Individual Single-Walled Carbon Nanotubes written by Oliver Kiowski and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2011-10 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thermal chemical vapor deposition (CVD) reactor was built and used to grow vertically and horizontally aligned carbon nanotube arrays. The as-grown nanotubes were investigated on a single tube level using near-infrared photoluminescence (PL) microscopy and PL excitation spectroscopy as well as Raman, atomic force and scanning electron microscopy. The PL of single-walled carbon nanotubes (SWNT) in different surroundings and at temperatures down to 4 K was analyzed. Ultralong CVD-grown nanotubes were imaged on Si/SiO2 to determine their chirality and to check structural integrity along the nanotube length. Furthermore, ultralong SWNTs were manipulated (moved, bent and fractured) employing an AFM. Finally, a new approach to determine relative abundances and PL quantum yields of semiconducting SWNTs in dispersions is presented, which is based on statistical counting of individual nanotubes by means of PL spectroscopy.
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.
Book Synopsis Ultrafast Lasers by : Martin E. Fermann
Download or read book Ultrafast Lasers written by Martin E. Fermann and published by CRC Press. This book was released on 2002-10-25 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering high-energy ultrafast amplifiers and solid-state, fiber, and diode lasers, this reference examines recent developments in high-speed laser technology. It presents a comprehensive survey of ultrafast laser technology, its applications, and future trends in various scientific and industrial areas. Topics include: micromachining applications for metals, dielectrics, and biological tissue; advanced electronics and semiconductor processing; optical coherence tomography; multiphoton microscopy; optical sampling and scanning; THz generation and imaging; optical communication systems; absolute phase control of optical signals; and more.
Book Synopsis Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes by :
Download or read book Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes written by and published by . This book was released on 2009 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quasi-1D confinement and reduced screening of photoexcited charges in single-walled carbon nanotubes (SWNTs) entails strongly-enhanced Coulomb interactions and exciton binding energies. Such amplified electron-hole (e-h) correlations have important implications for both fundamental physics and optoelectronic applications of nanotubes. The availability of"individualized" SWNT ensembles with bright and structured luminescence has rendered specific tube chiralities experimentally accessible. In these samples, evidence for excitonic behavior was found in absorption-luminescence maps, two-photon excited luminescence, or ultrafast carrier dynamics. Here, we report ultrafast mid-infrared (mid-IR) studies of individualized SWNTs, evidencing strong photoinduced absorption around 200 meV in semiconducting tubes of (6,5) and (7,5) chiralities. This manifests the observation of quasi-1D intra-excitonic transitions between different relative-momentum states, in agreement with the binding energy and calculated oscillator strength. Our measurements further reveal a saturation of the photoinduced absorption with increasing phase-space filling of the correlated e-h pairs. The transient mid-IR response represents a new tool, unhindered by restrictions of momentum or interband dipole moment, to investigate the density and dynamics of SWNT excitons.
Book Synopsis Physical Properties Of Carbon Nanotubes by : G Dresselhaus
Download or read book Physical Properties Of Carbon Nanotubes written by G Dresselhaus and published by World Scientific. This book was released on 1998-07-22 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an introductory textbook for graduate students and researchers from various fields of science who wish to learn about carbon nanotubes. The field is still at an early stage, and progress continues at a rapid rate. This book focuses on the basic principles behind the physical properties and gives the background necessary to understand the recent developments. Some useful computational source codes which generate coordinates for carbon nanotubes are also included in the appendix.
Book Synopsis Comprehensive Nanoscience and Technology by :
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.
