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Download or read book Nonlinear Electro-Thermal Transport in Metallic Carbon Nanotubes written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dinesh Kumar Bommidi
Publisher :
ISBN 13 : 9780438392267
Total Pages : 75 pages
Book Rating : 4.3/5 (922 download)
Download or read book Study of the Thermal Conductivity in Metal-coated Carbon Nanotubes Using Molecular Dynamics Atomistic Simulations written by Dinesh Kumar Bommidi and published by . This book was released on 2018 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: To improve the energy efficiency in many electronics and machinery applications, advanced Thermal Interface Materials (TIMs) with high heat dissipation ability and more pliability must be employed. Among a variety of promising choices to make the advanced TIMs, Vertically Aligned Carbon Nanotube (VACNT) turfs (arrays) outstand with their exceptional mechanical and thermal properties. Individual CNTs are quite flexible due to their quasi-one-dimensional structure and presence of strong sp2 bonds among the carbon atoms gives them great strength. Also, the dominance of ballistic phonon transport in the CNTs endows them superior thermal conductivity when compared to many metallic substrates. However, the defects in CNTs, misaligned axial contacts between CNTs in a CNT turf, and the CNTs/substrate resistance reduce the practical thermal conductivity of the material. It is hypothesized that the application of metal coatings on each CNT in a CNT turf would enhance the overall thermal conductivity of the material and improve the connectivity between the CNT turfs and the metallic substrate. As the diameter of the CNTs in a CNT turf is in the order of several nanometers, Molecular Dynamics (MD) atomistic simulations is selected as a tool which provide a deeper understanding in studying the thermal transport at the fundamental level. Thermal conduction in the metals is electron dominant whereas regular MD procedures are incapable of considering the energy exchange between these electrons and phonons. Therefore, a different mechanism called Two-temperature Model (TTM) coupled with Non-Equilibrium MD is used in this study and proved to be effective. MD code to procure the coefficient of thermal conductivity (kappa) was developed and the effects of the metal thickness, number of walls in the CNT and the role of diameter of CNT on kappa of the metal-coated CNTs was individually investigated. It was shown that the increase in the thickness of metal coating would impede the kappa of individual CNTs following an inverse power trend. Also, it was found that among the number of shells in the CNT and its diameter, the former parameter tends to contribute more towards the thermal transport than the latter. The results of this work are capable of predicting the optimal design structure for metal-coated VACNT composite for advanced thermal management applications.
Author : Hai-Dong Wang
Publisher : Springer Science & Business Media
ISBN 13 : 3642539777
Total Pages : 124 pages
Book Rating : 4.6/5 (425 download)
Download or read book Theoretical and Experimental Studies on Non-Fourier Heat Conduction Based on Thermomass Theory written by Hai-Dong Wang and published by Springer Science & Business Media. This book was released on 2014-02-07 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book mainly focuses on the theoretical and experimental study of non-Fourier heat conduction behavior. A novel thermomass theory is used as the theoretical basis, which provides a general heat conduction equation for the accurate prediction of non-Fourier heat conduction. In order to prove the validity of this thermomass theory, a large current was used to heat the metallic nanofilm at the minimum temperature of 3 K. The measured average temperature of the nanofilm was notably higher than the prediction of Fourier’s heat diffusion equation, while matching well with the general heat conduction equation. This is the first time that steady non-Fourier heat conduction has been observed. Moreover, this book concerns the role of electron-phonon interaction in metallic nanofilms, which involves the breakdown of the Wiedemann-Franz law at low temperatures and interfacial thermal resistance at femtosecond timescales. Readers will find useful information on non-Fourier heat conduction and the latest advances in the study of charge and heat transport in metallic nanofilms.
Author : Jean-Pierre Leburton
Publisher : CRC Press
ISBN 13 : 100046119X
Total Pages : 570 pages
Book Rating : 4.0/5 (4 download)
Download or read book Physical Models for Quantum Wires, Nanotubes, and Nanoribbons written by Jean-Pierre Leburton and published by CRC Press. This book was released on 2023-08-31 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of articles that span more than 30 years of research on developing comprehensive physical models. Address the effect of quantum confinement on lattice vibrations, carriers scattering rates, and charge transport and present practical examples of solutions to the Boltzmann equation. Topics on quantum transport and spin effects in unidimensional molecular structures such as carbon nanotubes and graphene nanoribbons.
Author : A. S. Maksimendo
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (228 download)
Download or read book Nonlinear Properties of Carbon Nanotubes in a Strong Electric Field written by A. S. Maksimendo and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical model and computations of the I-V characteristics of both doped and undoped long carbon nanotubes in a strong axial dc-fields at room temperatures have been presented. Negative differential conductivity has been predicted. It has been shown that \dI/dV\ for metal carbon nanotubes in the region of the negative differential conductivity significantly exceeds corresponding values for semiconducting ones. The predicted effect makes possible the design of wave-generating nanotube-based diods for submillimeter and infrared ranges.
Author : Aida Todri-Sanial
Publisher : Springer
ISBN 13 : 3319297465
Total Pages : 340 pages
Book Rating : 4.3/5 (192 download)
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.
Author : Francois Leonard
Publisher : William Andrew
ISBN 13 : 0815519680
Total Pages : 411 pages
Book Rating : 4.8/5 (155 download)
Download or read book Physics of Carbon Nanotube Devices written by Francois Leonard and published by William Andrew. This book was released on 2008-11-18 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Possibly the most impactful material in the nanotechnology arena, carbon nanotubes have spurred a tremendous amount of scientific research and development. Their superior mechanical and chemical robustness makes them easily manipulable and allows for the assembly of various types of devices, including electronic, electromechanical, opto-electronic and sensing devices.In the field of nanotube devices, however, concepts that describe the properties of conventional devices do not apply. Carbon nanotube devices behave much differently from those using traditional materials, and offer entirely new functionality. This book – designed for researchers, engineers and graduate students alike – bridges the experimental and theoretical aspects of carbon nanotube devices. It emphasizes and explains the underlying physics that govern their working principles, including applications in electronics, nanoelectromechanical systems, field emission, optoelectronics and sensing. Other topics include: electrical contacts, p-n junctions, transistors, ballistic transport, field emission, oscillators, rotational actuators, electron-phonon scattering, photoconductivity, and light emission. Many of the aspects discussed here differ significantly from those learned in books or traditional materials, and are essential for the future development of carbon nanotube technology.• Bridges experimental and theoretical aspects of carbon nanotube devices, focusing on the underlying physics that govern their working principles • Explains applications in electronics, nanoelectromechanical systems, field emission, optoelectronics and sensing. • Other topics include: electrical contacts, p-n junctions, transistors, ballistic transport, field emission, oscillators, rotational actuators, electron-phonon scattering, photoconductivity, and light emission. • Covers aspects that significantly differ from those learned in traditional materials, yet are essential for future advancement of carbon nanotube technology. * Bridges experimental and theoretical aspects of carbon nanotube devices, focusing on the underlying physics that govern their working principles * Explains applications in electronics, nanoelectromechanical systems, field emission, optoelectronics and sensing.* Other topics include: electrical contacts, p-n junctions, transistors, ballistic transport, field emission, oscillators, rotational actuators, electron-phonon scattering, photoconductivity, and light emission* Covers aspects that significantly differ from those learned in traditional materials, yet are essential for future advancement of carbon nanotube technology.
Author : Gang Zhang
Publisher : Elsevier
ISBN 13 : 0323473466
Total Pages : 386 pages
Book Rating : 4.3/5 (234 download)
Download or read book Thermal Transport in Carbon-Based Nanomaterials written by Gang Zhang and published by Elsevier. This book was released on 2017-06-13 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal Transport in Carbon-Based Nanomaterials describes the thermal properties of various carbon nanomaterials and then examines their applications in thermal management and renewable energy. Carbon nanomaterials include: one-dimensional (1D) structures, like nanotubes; two-dimensional (2D) crystal lattice with only one-atom-thick planar sheets, like graphenes; composites based on carbon nanotube or graphene, and diamond nanowires and thin films. In the past two decades, rapid developments in the synthesis and processing of carbon-based nanomaterials have created a great desire among scientists to gain a greater understanding of thermal transport in these materials. Thermal properties in nanomaterials differ significantly from those in bulk materials because the characteristic length scales associated with the heat carriers, phonons, are comparable to the characteristic length. Carbon nanomaterials with high thermal conductivity can be applied in heat dissipation. This looks set to make a significant impact on human life and, with numerous commercial developments emerging, will become a major academic topic over the coming years. This authoritative and comprehensive book will be of great use to both the existing scientific community in this field, as well as for those who wish to enter it. Includes coverage of the most important and commonly adopted computational and experimental methods to analyze thermal properties in carbon nanomaterials Contains information about the growth of carbon nanomaterials, their thermal properties, and strategies to control thermal properties and applications, allowing readers to assess how to use each material most efficiently Offers a comprehensive overview of the theoretical background behind thermal transport in carbon nanomaterials
Author : Mildred S. Dresselhaus
Publisher : Springer Science & Business Media
ISBN 13 : 354039947X
Total Pages : 461 pages
Book Rating : 4.5/5 (43 download)
Download or read book Carbon Nanotubes written by Mildred S. Dresselhaus and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: After a short introduction and a brief review of the relation between carbon nanotubes, graphite and other forms of carbon, the synthesis techniques and growth mechanisms for carbon nanotubes are described. This is followed by reviews on nanotube electronic structure, electrical, optical, and mechanical properties, nanotube imaging and spectroscopy, and nanotube applications.
Author : Michael F. P. Bifano
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (932 download)
Download or read book Theory and Measurements of Thermal Properties in Nanowires and Carbon Nanotubes written by Michael F. P. Bifano and published by . This book was released on 2012 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: The extraordinary potential of nanoscale materials and nano-constituent composite materials coupled with rapid progress in the capability to synthesize these materials has created a demand for their property characterization. To develop a better understanding of thermal transport in nanoscale wires and nanotubes, this thesis utilizes both theoretical and experimental techniques to determine how nanostructure geometry, surface properties, and heat treatment affect their ability to conduct thermal energy. As an example, the effect of heat treatment on the thermal conductivity of commercially available, chemical vapor deposition-grown, multiwalled carbon nanotubes (MWCNTs) is presented. The measurement device is implemented inside a scanning electron microscope equipped with nanomanipulators and a gas injected electron beam deposition system for repeatable in-situ sample characterization. MWCNT samples treated to 3000 C show a 5-fold increase in average thermal conductivity as compared to the as-synthesized samples. By including an estimation of thermal contact resistance due to phonon impedance mismatch, the average thermal conductivity of the heat-treated MWCNT specimens is estimated to be 228 W/m-K. The results suggest that heat treatment is a viable method to improve thermal conductivity and highlight the importance of MWCNTs quality in thermal management applications. Classical MD simulations are used to investigate the sensitivity of thermal conductivity to side-wall defects in SWCNTs. Vacancy repair is evident with heat treatment. 3000 C heat treatment of SWCNTs having varying degrees of defect concentrations is found to generally increase thermal conductivity by at least 10 %. The results suggest that phonon mean free path in (6,6) SWCNTs is nearly equally impeded by side-wall functionalization as compared to atomic vacancies. Classical MD simulations estimate that 2 atom % of hydrogenation and 1.5 - 2 % vacancy concentrations reduce thermal conductivity to the same degree. As compared to non-functionalized SWCNTs, the results suggest that the use of chemically functionalized SWCNTs as a second phase material in multifunctional CNT-polymer composites may reduce thermal transport. Nanoscale effects on thermal properties are further evaluated by an investigation into the dependency of specific heat and ballistic thermal conductance on cross-sectional geometry in free-standing isotropic non-metallic crystalline nanostructures. Analysis of phonon confinement is performed using dispersion relations found by numerically solving the Pochhammer-Chree frequency equation for a tube. These dispersion relations are used to evaluate the specific heat and ballistic thermal conductance in the nanostructures as a function of the nanostructure geometry, size, and surface stiffness. 1D, 2D, and 3D geometric phonon confinement regimes are recognized and found to depend on both the nanostructure's wall thickness and outer radius. Compared to nanowires, the frequency reduction of acoustic phonon modes in thinner walled nanotubes is shown to elevate the ballistic thermal conductance of the thin-walled nanotube between 0.2 K and 150 K. At 20 K, the ballistic thermal conductance of the thin-walled nanotube is found to be 300% greater than that of a solid nanowire. Surface modification of nanotubes and nanowires is performed using a multilayer elastic model to increase the average Young's modulus of the first three atomic surface layers. The acoustic stiffening of the interior and exterior lateral walls of nanotubes is found to have a contrasting effect on specific heat and thermal conductivity as compared to the outer surface modification of the nanowire. A 10% reduction in specific heat and a 2% reduction in lattice thermal conductivity at 50 K occur in a crystalline nanotube having a 10 nm outer and 5 nm inner diameter. In contrast, at the same temperature, an approximate 30% increase in thermal conductivity and specific heat occurs when the acoustically stiffened surface is applied to the outer diameter of a nanowire with a solid cross-sectional area. The simplified model has the potential to investigate the acoustic engineering of nanowires and nanotubes by inducing surface stiffening or softening via appropriate surface chemical functionalization protocols or coatings.
Author : Qing Zhang
Publisher : CRC Press
ISBN 13 : 9814364541
Total Pages : 304 pages
Book Rating : 4.8/5 (143 download)
Download or read book Advances in Nanodevices and Nanofabrication written by Qing Zhang and published by CRC Press. This book was released on 2012-07-17 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of devices at nanometer/molecular scale for electronic, photonic, optoelectronic, biological, and mechanical applications have been created through the rapid development of materials and fabrication technology. Further development of nanodevices strongly depends on the state-of-the-art knowledge of science and technology at the sub-100 nm scale. This book presents and highlights some of the key advances on, but not limited to, electronic and optoelectronic devices of nanometer/molecular scale, nanomechanics and nanoelectromechanical systems, electromechanical coupled devices, manipulation and aligning processes at nanometer/molecular scale, quantum phenomena, modeling of nanodevices and nanostructures, fabrication and property characterization of nanodevices, and nanofabrication with focused beam technology.
Author : Lin Qiu
Publisher : Academic Press
ISBN 13 : 012823623X
Total Pages : 358 pages
Book Rating : 4.1/5 (282 download)
Download or read book Micro and Nano Thermal Transport written by Lin Qiu and published by Academic Press. This book was released on 2022-02-09 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro and Nano Thermal Transport Research: Characterization, Measurement and Mechanism is a complete and reliable reference on thermal measurement methods and mechanisms of micro and nanoscale materials. The book has a strong focus on applications and simulation, providing clear guidance on how to measure thermal properties in a systematic way. Sections cover the fundamentals of thermal properties before introducing tools to help readers identify and analyze thermal characteristics of these materials. The thermal transport properties are then further explored by means of simulation which reflect the internal mechanisms used to generate such thermal properties. Readers will gain a clear understanding of thermophysical measurement methods and the representative thermal transport characteristics of micro/nanoscale materials with different structures and are guided through a decision-making process to choose the most effective method to master thermal analysis. The book is particularly suitable for those engaged in the design and development of thermal property measurement instruments, as well as researchers of thermal transport at the micro and nanoscale. Includes a variety of measurement methods and thermal transport characteristics of micro and nanoscale materials under different structures Guides the reader through the decision-making process to ensure the best thermal analysis method is selected for their setting Contains experiments and simulations throughout that help apply understanding to practice
Author : David Abraham Mann
Publisher :
ISBN 13 :
Total Pages : 168 pages
Book Rating : 4.F/5 ( download)
Download or read book Synthesis of Single-walled Carbon Nanotubes and Their Electro-thermal and Opto-electronic Properties written by David Abraham Mann and published by . This book was released on 2006 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ali Javey
Publisher : Springer Science & Business Media
ISBN 13 : 0387692851
Total Pages : 275 pages
Book Rating : 4.3/5 (876 download)
Download or read book Carbon Nanotube Electronics written by Ali Javey and published by Springer Science & Business Media. This book was released on 2009-04-21 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a complete overview of the field of carbon nanotube electronics. It covers materials and physical properties, synthesis and fabrication processes, devices and circuits, modeling, and finally novel applications of nanotube-based electronics. The book introduces fundamental device physics and circuit concepts of 1-D electronics. At the same time it provides specific examples of the state-of-the-art nanotube devices.
Author : Robert A. Bell
Publisher : Springer
ISBN 13 : 331919965X
Total Pages : 178 pages
Book Rating : 4.3/5 (191 download)
Download or read book Conduction in Carbon Nanotube Networks written by Robert A. Bell and published by Springer. This book was released on 2015-06-13 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis exploits the ability of the linear-scaling quantum mechanical code ONETEP to analyze systems containing many thousands of atoms. By implementing an electron transport capability to the code, it also investigates a range of phenomena associated with electrical conduction by nanotubes and, in particular, the process of transport electrons between tubes. Extensive work has been done on the conductivity of single carbon nanotubes. However, any realistic wire made of nanotubes will consist of a large number of tubes of finite length. The conductance of the resulting wire is expected to be limited by the process of transferring electrons from one tube to another.These quantum mechanical calculations on very large systems have revealed a number of incorrect claims made previously in the literature. Conduction processes that have never before been studied at this level of theory are also investigated.
Author : Shigeji Fujita
Publisher : John Wiley & Sons
ISBN 13 : 3527676708
Total Pages : 283 pages
Book Rating : 4.5/5 (276 download)
Download or read book Electrical Conduction in Graphene and Nanotubes written by Shigeji Fujita and published by John Wiley & Sons. This book was released on 2013-10-25 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written in a self-contained manner, this textbook allows both advanced students and practicing applied physicists and engineers to learn the relevant aspects from the bottom up. All logical steps are laid out without omitting steps. The book covers electrical transport properties in carbon based materials by dealing with statistical mechanics of carbon nanotubes and graphene - presenting many fresh and sometimes provoking views. Both second quantization and superconductivity are covered and discussed thoroughly. An extensive list of references is given in the end of each chapter, while derivations and proofs of specific equations are discussed in the appendix. The experienced authors have studied the electrical transport in carbon nanotubes and graphene for several years, and have contributed relevantly to the understanding and further development of the field. The content is based on the material taught by one of the authors, Prof Fujita, for courses in quantum theory of solids and quantum statistical mechanics at the University at Buffalo, and some topics have also been taught by Prof. Suzuki in a course on advanced condensed matter physics at the Tokyo University of Science. For graduate students in physics, chemistry, electrical engineering and material sciences, with a knowledge of dynamics, quantum mechanics, electromagnetism and solid-state physics at the senior undergraduate level. Includes a large numbers of exercise-type problems.
Author : Zhiwei Zhang
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (35 download)
Download or read book Electrical and Thermal Transport Measurements on Nano-structured Materials written by Zhiwei Zhang and published by . This book was released on 2006 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
