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Efficient Heat Removal From Power Semiconductor Devices Using Carbon Nanotube Arrays And Graphene 165705 Or Thermal Management Solutions Via Carbon Nanomaterials
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Book Synopsis Efficient Heat Removal from Power- Semiconductor Devices Using Carbon Nanotube Arrays and Graphene (165705) Or Thermal Management Solutions Via Carbon Nanomaterials by :
Download or read book Efficient Heat Removal from Power- Semiconductor Devices Using Carbon Nanotube Arrays and Graphene (165705) Or Thermal Management Solutions Via Carbon Nanomaterials written by and published by . This book was released on 2016 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Carbon Nanotube Films and Microjet Cooling Devices for Thermal Management by : Yoon Jin Won
Download or read book Carbon Nanotube Films and Microjet Cooling Devices for Thermal Management written by Yoon Jin Won and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The downsizing of electronic devices and the consequent increasing power densities pose thermal management challenges for the semiconductor industry. Since the present thermal solutions limit their cooling capacity, developing new cooling methods for electronic devices has become important. This dissertation presents two types of novel methods for heat dissipation from integrated circuits: One is the use of advanced thermal interface materials, such as carbon nanotubes (CNTs), to increase heat dissipation between the solid and solid surface, such as a chip and heat sink. The second method is the use of a microjet impingement device to improve heat transfer between a liquid and solid in a heat sink. As advanced interface materials, vertically aligned carbon nanotube films are promising because of their unique mechanical and thermal properties. The first part of the dissertation describes the design, fabrication, and testing of CNTs using resonators to characterize their mechanical properties. Discussed in detail is the preparation of carbon nanotubes using different recipes, resulting in varied thicknesses of single-walled carbon nanotube films and multi-walled carbon nanotube films. The measurements of the resonant frequency shifts due to the presence of the CNT films using a laser Doppler vibrometer system result in extracted moduli of 0.5-220 [Mu]m-thick nanotube films varying from 1 to 370 MPa. To show how the physics between the effective modulus and thickness are connected, an analysis for the height dependence of the modulus is provided. After an image analysis is presented, a nanotube dynamics simulation based on tube properties and film morphology is introduced to predict mechanical properties. In addition to discussing the proposed interface materials, the second part of the dissertation describes the design, fabrication and testing of microjet impingement cooling, which display high heat capacities, as an advanced thermal management solution. The design of single-jet and multi-jet arrays with different numbers of diameters, locations, and spacing is discussed. Specifically, this part demonstrates how the microjet hydrodynamics are quantified using two-dimensional images by [Mu]PIV techniques, enabling the reconstruction of the three-dimensional flow field. The results indicate that CNT films offer a mechanical compliance that is suitable for TIM applications and that the microscale liquid jet devices provide quantified flow physics for heat sink applications.
Book Synopsis Thermal Management Using Graphene and Carbon-Nanotubes by : Pradyumna Goli
Download or read book Thermal Management Using Graphene and Carbon-Nanotubes written by Pradyumna Goli and published by . This book was released on 2014 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the application of graphene and carbon nanotubes (CNTs) for thermal management of high-power batteries and interconnects. The research is focused on three applications: (i) thermal phase change materials (PCMs) with graphene fillers for thermal management of battery packs; (ii) CNTs incorporated in the battery electrodes; (iii) graphene coatings for copper (Cu) interconnects. In this study, lithium-ion (Li-ion) batteries were used for testing the proposed approaches. The graphene solutions for synthesis of graphene PCMs were obtained by the liquid-phase exfoliation. The graphene coatings on Cu films were grown by the chemical vapor deposition (CVD). In the first part of the dissertation, it is demonstrated that thermal management of Li-ion batteries can be drastically improved using PCM with graphene fillers. Incorporation of graphene to the hydrocarbon-based PCM allowed one to increase its thermal conductivity by more than two orders of magnitude while preserving its latent heat storage ability. A combination of the sensible and latent heat storage together with the improved heat conduction outside of the battery pack leads to a significant decrease in the temperature rise inside the Li-ion battery pack. I the second part of the dissertation, it is shown that thermal properties of Li-ion battery electrodes can be improved by incorporation of CNTs. The electrodes were synthesized via an inexpensive scalable filtration method , which can be extended to commercial electrode-active materials. The measurements reveal that the in-plane (cross-plane) thermal conductivity of the cathodes with the highest battery capacity was ~50 W/mK (3 W/mK) at room temperature. These values are up to two-orders-of-magnitude higher than those for conventional electrodes based on carbon black. The highest in-plane thermal conductivity achieved in the carbon-nanotube-enhanced electrodes was ~141 W/mK. In third part of the dissertation, it is demonstrated that graphene coating can strongly increase the thermal conductivity of Cu films as compared to the reference Cu and annealed Cu films. The observed improvement of thermal properties of graphene coated Cu films results primarily from the changes in Cu morphology during graphene CVD rather than from graphene's action as an additional heat conducting channel. The obtained results are important for thermal management of advanced batteries and downscaled computer chips.
Book Synopsis Emerging Applications of Carbon Nanotubes and Graphene by : Bhanu Pratap Singh
Download or read book Emerging Applications of Carbon Nanotubes and Graphene written by Bhanu Pratap Singh and published by CRC Press. This book was released on 2023-02-27 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews recent and emerging applications of carbon nanotubes and graphene materials in a wide range of sectors. Detailed applications include structural materials, ballistic materials, energy storage and conversion, batteries, supercapacitors, smart sensors, environmental protection, nanoelectronics, optoelectronic and photovoltaics, thermoelectric, and conducting wires. It further covers human and structural health monitoring, and thermal management applications. Key selling features: Exclusively takes an application-oriented approach to cover emerging areas in carbon nanotubes and graphene Covers fundamental and applied knowledge related to carbon nanomaterials Includes advanced applications like human and structural health monitoring, smart sensors, ballistic protection and so forth Discusses novel applications such as thermoelectrics along with environmental protection related application Explores aspects of energy storage, generation and conversion including batteries, supercapacitors, and photovoltaics This book is aimed at graduate students and researchers in electrical, nanomaterials, chemistry, and other related areas.
Book Synopsis A Comprehensive Guide to Solar Energy Systems by : Trevor Letcher
Download or read book A Comprehensive Guide to Solar Energy Systems written by Trevor Letcher and published by Academic Press. This book was released on 2018-05-17 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Comprehensive Guide to Solar Energy Systems: With Special Focus on Photovoltaic Systems, the most advanced and research focused text on all aspects of solar energy engineering, is a must have edition on the present state of solar technology, integration and worldwide distribution. In addition, the book provides a high-level assessment of the growth trends in photovoltaics and how investment, planning and economic infrastructure can support those innovations. Each chapter includes a research overview with a detailed analysis and new case studies that look at how recent research developments can be applied. Written by some of the most forward-thinking professionals, this book is an invaluable reference for engineers. Contains analysis of the latest high-level research and explores real world application potential in relation to developments Uses system international (SI) units and imperial units throughout to appeal to global engineers Offers measurable data written by a world expert in the field on the latest developments in this fast moving and vital subject
Book Synopsis Carbon Nanotubes, Graphene, and Associated Devices V by : Didier Pribat
Download or read book Carbon Nanotubes, Graphene, and Associated Devices V written by Didier Pribat and published by . This book was released on 2012-10-11 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Proceedings Vol. 7821
Book Synopsis Energy Relaxation and Thermal Rectification in Carbon Devices by : Balaji Ramasubramanian
Download or read book Energy Relaxation and Thermal Rectification in Carbon Devices written by Balaji Ramasubramanian and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Power dissipation is a major challenge in modern electronics, from battery-limited portable devices to cooling in massive data centers. The most often cited technological roadblock of nanoscale electronics is the textquotedblleft{}power problemtextquotedblright{} i.e. power densities and device temperatures reaching levels that will prevent their reliable operation. A majority of the power is dissipated during individual transistor switching, but a great deal of power is also dissipated through thermionic leakage. Therefore, a deeper understanding of power dissipation and energy efficiency at the individual device level could have a global impact, affecting all future electronics. In general, power in electronic devices is dissipated in the form of heat and is slowly lost to the environment. Given that all integrated circuits have a gate oxide (SiO$_2$) and several layers of inter-level-dielectric, the bulk of the heat is likely to be retained in the device because SiO$_2$ has a much lower thermal conductivity (1.4 W/m-K) than silicon (150 W/m-K). This leads to self-heating, mobility degradation and unreliable performance over time. This work examines the physics of energy relaxation in nanoscale transistors based on new popular materials like carbon nanotubes and graphene nanoribbons. The results hold significance for the design of future low power nanoscale devices and show that tunnel devices based on carbon nanotubes with a band gap less than 0.44 eV dissipate less than one sixtieth the power dissipated in traditional thermionic transistors. In addition, this thesis explores ways of efficient cooling of electronic devices by controlling heat flow and shows that thermal rectification in patterned graphene structures is possible.
Book Synopsis Graphene and Carbon Nanotube Field Effect Transistors by :
Download or read book Graphene and Carbon Nanotube Field Effect Transistors written by and published by . This book was released on 2012 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Properties of Graphene and Applications for Thermal Management of High-power Density Electronics by : Zhong Yan
Download or read book Thermal Properties of Graphene and Applications for Thermal Management of High-power Density Electronics written by Zhong Yan and published by . This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: In part two of this dissertation, I report the results of investigation of thermal conductivity of thin films made of a novel nanostructured graphene material, which consists of graphene nanoribbons encapsulated in single walled carbon nanotubes. The temperature dependent Raman spectrum of this material was measured in order to obtain the temperature coefficients of G + peak and 2D peaks. Using the Raman optothermal technique, I determine the local temperature rise due to laser heating from the shifts in Raman peak positions. A finite element analysis method was conducted to simulated heat dissipation in the samples and to determine their effective thermal conductivity. The obtained results suggest that this hybrid graphene-carbon nanotube material can be used as fillers in thermal interface materials.
Book Synopsis Thermal Transport in Graphene Multilayers and Nanoribbons by : Samia Subrina
Download or read book Thermal Transport in Graphene Multilayers and Nanoribbons written by Samia Subrina and published by . This book was released on 2011 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the electronic industry aggressively moves towards nanometer designs thermal issues are becoming increasingly important for the high-end electronic chips. One of the approaches to mitigate the self-heating problems is the high-heat-flux hot-spot removal via incorporation into the chip designs of materials with the high thermal conductivity. Graphene is found to be one of the best known heat conductors, thus it can be used in nanoelectronic and optoelectronic devices as a heat spreader component. Graphene, the latest isolated allotrope of carbon made of individual atomic sheets bound in two dimensions, shows many remarkable properties. A non-contact method of measuring G peak position of the Raman spectrum as a function of both the temperature of the graphene sample and the power of the heat source was used to measure the thermal conductivity of graphene. The samples in the experiment had approximately rectangle geometry and the assumption about the plane heat wave was used for the data extraction. In this dissertation research we propose to develop a model and numerical procedure for the (i) accurate modeling-based data extraction for the thermal conductivity measurements; and (ii) simulate heat propagation in semiconductor device structures with graphene layers incorporated as heat spreaders. To achieve the goals of this dissertation research we simulated the heat transport in graphene using the finite element method (FEM) with the help of COMSOL software package, which solves numerically the partial differential equations. The modeling based data extraction was necessary to determine thermal conductivity of the graphene flakes of arbitrary shape. It also substantially improved the accuracy of the measurements. The simulation of heat propagation in device structures with graphene heat spreaders allows one to assess the feasibility of the graphene high-heat-flux thermal management. We focused on understanding how thermal transport is influenced by a surface geometry of the sample and geometries of the heat sources. The simulation results showed that the size, shape and heat source geometry impact heat propagation in different ways and have to be included in the experimental data extraction. The simulation procedure provided a necessary input for next experiments on heat conduction in graphene structures e.g., graphene multi-layers and graphene-heat sink structures and other device-level thermal management applications. It was found that the incorporation of graphene or few-layer graphene (FLG) layers with proper heat sinks can substantially lower the temperature of the localized hot spots. The developed model and obtained results are important for the design of graphene heat spreaders and interconnects and lead to a new method of heat removal from nanoelectronic and 3-D chips.
Download or read book Storing Energy written by Trevor Letcher and published by Elsevier. This book was released on 2022-01-18 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt: Storing Energy: With Special Reference to Renewable Energy Sources, Second Edition has been fully revised and substantially extended to provide up-to-date and essential discussion that will support the needs of the world’s future energy and climate change policies. New sections cover thermal energy storage, tidal storage, sustainability issues in relation to storing energy and impacts on global energy markets. Various systems are discussed, including mechanical/kinetic, thermal, electrochemical and other chemical, as well as other emerging technologies. Incorporating advancements described in the book will help the people of the world further overcome the problems related to future energy and climate change. Covers all types of energy storage systems, allowing and encouraging comparisons to be made Written by world experts in the field to provide the latest developments in this fast moving and vital technology Covers the technical, environmental, social and political aspects related to the storing of energy, and in particular, renewable energy
Book Synopsis Electricity from Sunlight by : Vasilis M. Fthenakis
Download or read book Electricity from Sunlight written by Vasilis M. Fthenakis and published by John Wiley & Sons. This book was released on 2018-01-10 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Praised for its visual appeal, conversational style and clear explanation of complex ideas with minimal mathematics, Electricity from Sunlight has been thoroughly revised and updated to reflect advances in the global PV market, economics and installed capacity. Key features of the 2nd edition include: A timely update of the advances of photovoltaics (PV), with major new material on grid-connected systems. More in-depth treatment of PV scientific principles, solar cells, modules, and systems. Up-to-date coverage of the PV market including conversion efficiencies and the expansion of grid-friendly power plants. End-of-chapter problems with solutions manual available to instructors via companion website. Additional end-of-chapter questions and answers to support students through guided self-study. New chapters on manufacturing processes and on materials and other resources availability. New large-scale PV section covering the growth of global capacity, utility-scale PV and affordable solutions for intermittency. Systems analysis of new applications empowered by low-cost PV, such as energy storage and water desalination. Significantly expanded economics and environmental section explaining leveled cost of electricity versus upfront costs, energy return on investments, and lifecycle analysis. Electricity from Sunlight: Photovoltaics Systems Integration and Sustainability, Second Edition is an essential primer for new entrants to the PV industry, needing a basic appreciation of complete PV systems, and to students on undergraduate and graduate courses on renewable energy and photovoltaics. It also offers a unique treatise of the sustainability of emerging transformative technologies, which makes it useful to both system analysts and energy policy strategists. Co-author, Vasilis Fthenakis, is Recipient of the 2018 William R. Cherry Award The Cherry Award recognizes an individual engineer or scientist who has made a significant contribution to the advancement of the science and technology of photovoltaic energy conversion, with dissemination by substantial publications and presentations. Fthenakis was honored for his pioneering research at the interface of energy and the environment that catalyzed photovoltaic technology advancement and deployment world-wide.
