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Photoconductivity Of Aligned Carbon Nanotube Fibers
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Book Synopsis Photoconductivity of Aligned Carbon Nanotube Fibers by : Ye Liu
Download or read book Photoconductivity of Aligned Carbon Nanotube Fibers written by Ye Liu and published by ProQuest. This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs) are of great interest in today's research, and more and more researchers are getting interested in what happens when they interact with photons. While a light of certain intensity (usually a laser beam) shining on a carbon nanotube composition, usually two kinds of physical responses will be observed: photoconductivity and photomechanical actuation. Though photoconductivity of single carbon nanotube and thin CNT bundles has been studied thoroughly, photoconductivity of macro scale carbon nanotube devices is expected to have properties different from a single nanotube or thin nanotube bundles, since an interaction of electrodes and nanotube devices is going to play a significant role in the generation of photoconductivity. A study of photoconductivity of unaligned carbon nanotube films has been conducted by our group previously, which has proved some of our expectation of the differences. However, due to fabrication difficulty and structure fragility, the experiment and results about photoconductivity of aligned carbon nanotube fibers introduced in this master's thesis have never been reported before. This novel study will not only further reveal the differences of photoconductivity between macro scale carbon nanotube devices and a single nanotube, but also prove our expectation of the unique properties of aligned carbon nanotube fibers. In this thesis, the author will describe a fabrication procedure for partially aligned carbon nanotube fibers and the assembly step for the samples, then reason the experimental details. After that, the result will be introduced and labored. For the photocurrent of aligned CNT fibers, a "position effect", a dependency for the frequency of incident light pulse, and a linear photocurrent-intensity curve is observed, which are similar to the responses of unaligned films. But meanwhile, unique properties such as a fast dynamic response, an even faster dynamic response with "flood light exposure", a higher quantum efficiency and a dependency on the polarization of incident light will all be revealed. These results fit in our previous prediction of the electric mechanism of the photoconductivity of aligned CNT fibers, which is based on electron-hole pair generation and subsequent separation by both the built-in voltage at the electrode-fiber contact and the electrical fields induced by external voltage source and incident light. These results have also demonstrated that the molecular desorption mechanism may not be the dominant origin of the photoconductivity, since the dynamic response we observed is much faster than this process. Another contribution of this thesis is that we obtained a relatively large quantum efficiency (~6.4%) using partially aligned carbon nanotube fibers. This demonstrates that carbon nanotubes can be utilized in potential energy conversion devices as photo-detectors or solar cells, which together with the photomechanical applications of CNT structures is suggesting a promising future in research and engineering regarding carbon nanotubes.
Book Synopsis Photoconductivity Studies of Carbon Nanotubes on Quartz Substrates by : Olivia M. Castellini
Download or read book Photoconductivity Studies of Carbon Nanotubes on Quartz Substrates written by Olivia M. Castellini and published by . This book was released on 2004 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Carbon Filaments and Nanotubes: Common Origins, Differing Applications? by : L.P. Biró
Download or read book Carbon Filaments and Nanotubes: Common Origins, Differing Applications? written by L.P. Biró and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon filament, vapor grown carbon fibers and carbon nanotubes have been discovered to have remarkable properties, opening they way for their use in intriguing and novel applications in electronics, chemistry and materials science. There are many similarities between nanotubes and filaments, leading many researchers to critically compare the two materials, their production, and potential applications. The two materials are compared and contrasted in depth in the present book, which is a comprehensive review of current research activity, growth mechanisms, physical properties, industrial production, and applications. The structures are discussed using a unified approach, which helps to compare growth mechanisms, contrasting morphological differences, and detailing how novel properties depend on such differences.
Book Synopsis Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials by : Igor A. Levitsky
Download or read book Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials written by Igor A. Levitsky and published by Springer Science & Business Media. This book was released on 2012-12-22 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials describes physical, optical and spectroscopic properties of the emerging class of nanocomposites formed from carbon nanotubes (CNTs) interfacing with organic and inorganic materials. The three main chapters detail novel trends in photophysics related to the interaction of light with various carbon nanotube composites from relatively simple CNT/small molecule assemblies to complex hybrids such as CNT/Si and CNT/DNA nanostructures. The latest experimental results are followed up with detailed discussions and scientific and technological perspectives to provide a through coverage of major topics including: -Light harvesting, energy conversion, photoinduced charge separation and transport in CNT based nanohybrids -CNT/polymer composites exhibiting photoactuation; and -Optical spectroscopy and structure of CNT/DNA complexes. Including original data and a short review of recent research, Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials makes this emerging field of photophysics and its applications available to academics and professionals working with carbon nanotube composites in fundamental and applied fields
Book Synopsis Carbon Nanotubes for Interconnects by : Aida Todri-Sanial
Download or read book Carbon Nanotubes for Interconnects written by Aida Todri-Sanial and published by Springer. This book was released on 2016-07-09 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a single-source reference on the use of carbon nanotubes (CNTs) as interconnect material for horizontal, on-chip and 3D interconnects. The authors demonstrate the uses of bundles of CNTs, as innovative conducting material to fabricate interconnect through-silicon vias (TSVs), in order to improve the performance, reliability and integration of 3D integrated circuits (ICs). This book will be first to provide a coherent overview of exploiting carbon nanotubes for 3D interconnects covering aspects from processing, modeling, simulation, characterization and applications. Coverage also includes a thorough presentation of the application of CNTs as horizontal on-chip interconnects which can potentially revolutionize the nanoelectronics industry. This book is a must-read for anyone interested in the state-of-the-art on exploiting carbon nanotubes for interconnects for both 2D and 3D integrated circuits.
Book Synopsis Carbon Nanotubes and Graphene for Photonic Applications by : Shinji Yamashita
Download or read book Carbon Nanotubes and Graphene for Photonic Applications written by Shinji Yamashita and published by Elsevier. This book was released on 2013-08-31 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optical properties of carbon nanotubes and graphene make them potentially suitable for a variety of photonic applications. Carbon nanotubes and graphene for photonic applications explores the properties of these exciting materials and their use across a variety of applications.Part one introduces the fundamental optical properties of carbon nanotubes and graphene before exploring how carbon nanotubes and graphene are synthesised. A further chapter focusses on nonlinearity enhancement and novel preparation approaches for carbon nanotube and graphene photonic devices. Chapters in part two discuss carbon nanotubes and graphene for laser applications and highlight optical gain and lasing in carbon nanotubes, carbon nanotube and graphene-based fiber lasers, carbon-nanotube-based bulk solid-state lasers, electromagnetic nonlinearities in graphene, and carbon nanotube-based nonlinear photonic devices. Finally, part three focusses on carbon-based optoelectronics and includes chapters on carbon nanotube solar cells, a carbon nanotube-based optical platform for biomolecular detection, hybrid carbon nanotube-liquid crystal nanophotonic devices, and quantum light sources based on individual carbon nanotubes.Carbon nanotubes and graphene for photonic applications is a technical resource for materials scientists, electrical engineers working in the photonics and optoelectronics industry and academics and researchers interested in the field. Covers the properties and fabrication of carbon nanotubes and graphene for photonic applications Considers the uses of carbon nanotubes and graphene for laser applications Explores numerous carbon-based light emitters and detectors
Book Synopsis Enhanced Thermal Conductance of Polymer Composites Through Embedding Aligned Carbon Nanofibers by :
Download or read book Enhanced Thermal Conductance of Polymer Composites Through Embedding Aligned Carbon Nanofibers written by and published by . This book was released on 2016 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this work is to find a more efficient method of enhancing the thermal conductance of polymer thin films. This work compares polymer thin films embedded with randomly oriented carbon nanotubes to those with vertically aligned carbon nanofibers. Thin films embedded with carbon nanofibers demonstrated a similar thermal conductance between 40-60 [mu]m and a higher thermal conductance between 25-40 [mu]m than films embedded with carbon nanotubes with similar volume fractions even though carbon nanotubes have a higher thermal conductivity than carbon nanofibers.
Download or read book Fiber Materials written by Jeenat Aslam and published by Walter de Gruyter GmbH & Co KG. This book was released on 2023-03-20 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced fiber materials have been developed for various superior applications because of their higher mechanical flexibility, high-temperature resistance, and outstanding chemical stability. This book presents an overview of the current development of advanced fiber materials, fabrication methods, and applications. Applications covered include pollution control, environment, energy, information storage technology, optical and photonic, photocatalysis, textile, drug delivery, tumor therapy, corrosion protection applications, and a state of art of advanced fiber materials.
Book Synopsis Design of Very High-strength Aligned and Interconnected Carbon Nanotube Fibers Based on Molecular Dynamics Simulations by : Charles F. Cornwell
Download or read book Design of Very High-strength Aligned and Interconnected Carbon Nanotube Fibers Based on Molecular Dynamics Simulations written by Charles F. Cornwell and published by . This book was released on 2010 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Carbon Nanotube Fiber Spun from Wetted Ribbon by :
Download or read book Carbon Nanotube Fiber Spun from Wetted Ribbon written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fiber of carbon nanotubes was prepared by a wet-spinning method involving drawing carbon nanotubes away from a substantially aligned, supported array of carbon nanotubes to form a ribbon, wetting the ribbon with a liquid, and spinning a fiber from the wetted ribbon. The liquid can be a polymer solution and after forming the fiber, the polymer can be cured. The resulting fiber has a higher tensile strength and higher conductivity compared to dry-spun fibers and to wet-spun fibers prepared by other methods.
Download or read book Nanomaterials written by Suvardhan Kanchi and published by John Wiley & Sons. This book was released on 2018-05-29 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution in the nanotechnology world clearly signifies a need for a broader understanding of the subject and this book will contribute to the effort. Nanostructure science and technology is a broad and interdisciplinary area of research and development that has been growing explosively in the past decades. The contents of this book include mainly the fundamentals of nanoparticles, state-of-the-art in synthesis and characterization of nanomaterials, as well the influence of nanomaterials on the analytical systems (macro to micro & lab-on-a-chip) for biomedical, environmental and engineering applications. This book seeks to broaden the understanding of modern developments in nanomaterials and comprises excellent contributions from subject matter experts working on most aspects of nanomaterials and nanotechnology.
Book Synopsis Springer Handbook of Nanotechnology by : Bharat Bhushan
Download or read book Springer Handbook of Nanotechnology written by Bharat Bhushan and published by Springer. This book was released on 2017-11-05 with total page 1704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive handbook has become the definitive reference work in the field of nanoscience and nanotechnology, and this 4th edition incorporates a number of recent new developments. It integrates nanofabrication, nanomaterials, nanodevices, nanomechanics, nanotribology, materials science, and reliability engineering knowledge in just one volume. Furthermore, it discusses various nanostructures; micro/nanofabrication; micro/nanodevices and biomicro/nanodevices, as well as scanning probe microscopy; nanotribology and nanomechanics; molecularly thick films; industrial applications and nanodevice reliability; societal, environmental, health and safety issues; and nanotechnology education. In this new edition, written by an international team of over 140 distinguished experts and put together by an experienced editor with a comprehensive understanding of the field, almost all the chapters are either new or substantially revised and expanded, with new topics of interest added. It is an essential resource for anyone working in the rapidly evolving field of key technology, including mechanical and electrical engineers, materials scientists, physicists, and chemists.
Book Synopsis Medicinal Chemistry and Pharmacological Potential of Fullerenes and Carbon Nanotubes by : Franco Cataldo
Download or read book Medicinal Chemistry and Pharmacological Potential of Fullerenes and Carbon Nanotubes written by Franco Cataldo and published by Springer Science & Business Media. This book was released on 2008-09-08 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fullerenes and nanotubes are two classes of carbon structures or allotropes, which were discovered about 17 years ago. Since that time, many chemical derivatives have been synthesized using fullerenes and nanotubes as building blocks. Particularly promising was the theory that the chemical properties of fullerenes, and certain derivatives, made them likely candidates for anticancer drugs, inhibitors of viruses such as HIV, or even as anti-bacterials. Their cyctotoxicity can also be controlled by specific circumstances. In addition, the funtionalization of nanotubes has not only produced relatively simple derivatives, but also complex hybrids with biological macromolecules, which show unique supramolecular architecture and which are promising in many medical applications. The application of fullerenes and nanotubes in medicine is at the frontier of our knowledge, thus the work in this field represents the basis for future novel developments.
Book Synopsis Fabrication and Characterisation of Vertically Aligned Carbon Nanotube Architectures on Silicon (100) and Their Device-applications by : Jingxian Yu
Download or read book Fabrication and Characterisation of Vertically Aligned Carbon Nanotube Architectures on Silicon (100) and Their Device-applications written by Jingxian Yu and published by . This book was released on 2008 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoconductivity of Activated Carbon Fibers by :
Download or read book Photoconductivity of Activated Carbon Fibers written by and published by . This book was released on 1990 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The photoconductivity is measured on a high-surface-area disordered carbon material, namely activated carbon fibers, to investigate their electronic properties. Measurements of decay time, recombination kinetics and temperature dependence of the photoconductivity generally reflect the electronic properties of a material. The material studied in this paper is a highly disordered carbon derived from a phenolic precursor, having a huge specific surface area of 1000--2000m2/g. Our preliminary thermopower measurements suggest that this carbon material is a p-type semiconductor with an amorphous-like microstructure. The intrinsic electrical conductivity, on the order of 20S/cm at room temperature, increases with increasing temperature in the range 30--290K. In contrast with the intrinsic conductivity, the photoconductivity in vacuum decreases with increasing temperature. The recombination kinetics changes from a monomolecular process at room temperature to a biomolecular process at low temperatures. The observed decay time of the photoconductivity is {approx equal}0.3sec. The magnitude of the photoconductive signal was reduced by a factor of ten when the sample was exposed to air. The intrinsic carrier density and the activation energy for conduction are estimated to be {approx equal}1021/cm3 and {approx equal}20meV, respectively. The majority of the induced photocarriers and of the intrinsic carriers are trapped, resulting in the long decay time of the photoconductivity and the positive temperature dependence of the conductivity. 54 refs., 11 figs., 3 tabs.
Book Synopsis Optical Nano and Micro Actuator Technology by : George K. Knopf
Download or read book Optical Nano and Micro Actuator Technology written by George K. Knopf and published by CRC Press. This book was released on 2017-12-19 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Optical Nano and Micro Actuator Technology, leading engineers, material scientists, chemists, physicists, laser scientists, and manufacturing specialists offer an in-depth, wide-ranging look at the fundamental and unique characteristics of light-driven optical actuators. They discuss how light can initiate physical movement and control a variety of mechanisms that perform mechanical work at the micro- and nanoscale. The book begins with the scientific background necessary for understanding light-driven systems, discussing the nature of light and the interaction between light and NEMS/MEMS devices. It then covers innovative optical actuator technologies that have been developed for many applications. The book examines photoresponsive materials that enable the design of optically driven structures and mechanisms and describes specific light-driven technologies that permit the manipulation of micro- and nanoscale objects. It also explores applications in optofluidics, bioMEMS and biophotonics, medical device design, and micromachine control. Inspiring the next generation of scientists and engineers to advance light-driven technologies, this book gives readers a solid grounding in this emerging interdisciplinary area. It thoroughly explains the scientific language and fundamental principles, provides a holistic view of optical nano and micro actuator systems, and illustrates current and potential applications of light-driven systems.
Book Synopsis Incorporating Carbon Nanotubes Into Carbon Fiber Via Surface Modification by : Robert Benjamin Ripy
Download or read book Incorporating Carbon Nanotubes Into Carbon Fiber Via Surface Modification written by Robert Benjamin Ripy and published by . This book was released on 2016 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ever more advanced materials need to be designed to further the exploration of avenues of science and engineering. Metals and traditional composites are not meeting the needs of today's stringent demands for lightweight and strong materials. There is a need for advanced materials that are lighter and stronger to replace conventional materials; carbon fiber composites became the obvious choice because of their outstanding mechanical properties. Polyacrylonitrile (PAN) based carbon fiber has reached its apex in terms of its strength to weight ratio. Carbon nanotubes (CNTs) offer a lightweight and potentially stronger alternative to PAN based fibers. However, it is difficult to translate the properties of individual CNTs macroscopically. The next step to overcome this barrier is to introduce highly aligned CNTs into carbon fiber. Carbon nanotube modified carbon fibers are imperative for the next step in achieving lightweight, ultra-strong fibers, to enhance their fuel efficient application in vehicles.
