Thermal Characterization Of One Dimensional Carbon Nanostructures

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Thermal Characterization of One-Dimensional Carbon Nanostructures

Author : Eric Kenji Mayhew
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (934 download)

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Book Synopsis Thermal Characterization of One-Dimensional Carbon Nanostructures by : Eric Kenji Mayhew

Download or read book Thermal Characterization of One-Dimensional Carbon Nanostructures written by Eric Kenji Mayhew and published by . This book was released on 2013 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The excellent thermal properties of individual carbon nanostructures, such as carbon nanofibers (CNFs), carbon nanotubes (CNTs), and CNT fibers, have provided the impetus for the development of thermal interface materials that can incorporate these nanostructures. The thermal conductivity measurements of individual CNFs, CNT strands, CNT fibers, and CNT-polymer composite fibers are made using a Wollaston wire T-type probe method inside of a scanning electron microscope. CNFs are studied to determine the degree of improvement in structure and thermal conductivity that can be attained by annealing chemical vapor deposition grown CNFs. The results show a significant increase in thermal conductivity of CNFs that are annealed at 2800°C for 20 hours compared with the non-heat-treated samples. Thermal conductivity measurements are also made on CNT fibers, CNT-polymer composite fibers, and individual CNT strands pulled from the CNT fibers. The thermal conductivity values are, by far, the highest reported values for CNT fibers.

One-Dimensional Nanostructures

Author : Zhiming M Wang
Publisher : Springer Science & Business Media
ISBN 13 : 0387741321
Total Pages : 335 pages
Book Rating : 4.3/5 (877 download)

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Book Synopsis One-Dimensional Nanostructures by : Zhiming M Wang

Download or read book One-Dimensional Nanostructures written by Zhiming M Wang and published by Springer Science & Business Media. This book was released on 2008-07-20 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: One-dimensional (1D) nanostructures, including nanowires, nanotubes and quantum wires, have been regarded as the most promising building blocks for nanoscale electronic and optoelectronic devices. This book presents exciting, state-of-the-art developments in synthesis and properties of 1D nanostructures with many kinds of morphologies and compositions as well as their considerable impact on spintronics, information storage, and the design of field-effect transistors.

Thermal Characterization and Modeling of Nanostructured Materials

Author : Matthew Alan Panzer
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (652 download)

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Book Synopsis Thermal Characterization and Modeling of Nanostructured Materials by : Matthew Alan Panzer

Download or read book Thermal Characterization and Modeling of Nanostructured Materials written by Matthew Alan Panzer and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal conduction resistances are becoming increasingly complicated as advanced materials, photonics, and electronic devices incorporate more nanostructured features (e.g. carbon nanotubes (CNTs), ultra-thin films, nanoparticles, etc.). The reduced dimensions and large interface densities of nanostructured materials modify the energy transport physics, requiring the development of new thermal models and thermal metrology techniques with deep sub-micron spatial resolution. This research develops and applies ultra-fast (nanosecond thermoreflectance (TR) and picosecond time-domain thermoreflectance (TDTR)) to characterize thermal resistances in carbon nanotube arrays and thin-film materials. In conjunction, this work develops novel models of thermal transport within the nanostructured material and interfaces. Owing to their high intrinsic thermal conductivities (~3000 W/m/K), aligned arrays of CNTs are promising for use in advanced thermal interface materials. Nanosecond TR data for metal-coated aligned nanotube films show that the thermal resistance of the films is dominated by interfaces due to incomplete CNT-metal contact, and that the thermal resistance of these films can be significantly reduced by varying the metallic composition at the interface. This work presents data for the growth-interface thermal resistance of multiwalled carbon nanotubes measured directly using TDTR with a variable modulation frequency technique. The abrupt changes in geometry at nanostructured interfaces induce phonon confinement, which creates additional contributions to the interface resistance. This work investigates model problems of thermal transport through abrupt junctions between a one-dimensional lattice in contact with a two- and three-dimensional lattice using a Green's function approach. The model indicates that the thermal resistances due to dimensional mismatch are comparable to those due to material property mismatch effects. Finally, the results suggest that engineering an intentional impedance mismatch at a nanostructured interface may enhance the transmission of energy. This work also develops a picoseconds pump/probe thermoreflectance system to achieve deep sub-micron spatial resolution of thermal properties of ultra thin hafnium oxide films, which are promising for the next generation of gate oxides for transistors. These data isolate the intrinsic film resistance and show that crystalline nanoparticles reduce the intrinsic thermal conductivity its bulk value.

Two-Dimensional Carbon

Author : Wu Yihong
Publisher : CRC Press
ISBN 13 : 9814411949
Total Pages : 348 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis Two-Dimensional Carbon by : Wu Yihong

Download or read book Two-Dimensional Carbon written by Wu Yihong and published by CRC Press. This book was released on 2014-04-09 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: After a brief introduction to the fundamental properties of graphene, this book focuses on synthesis, characterization and application of various types of two-dimensional (2D) nanocarbons ranging from single/few layer graphene to carbon nanowalls and graphene oxides. Three major synthesis techniques are covered: epitaxial growth of graphene on SiC, chemical synthesis of graphene on metal, and chemical vapor deposition of vertically aligned carbon nanosheets or nanowalls. One chapter is dedicated to characterization of 2D nanocarbon using Raman spectroscopy. It provides extensive coverage for applications of 2D carbon in energy storage including supercapacitor, lithium ion battery and fuel cells.

Electrical and Thermal Characterization of Low Dimensional Materials and Devices

Author : Ruben A. Salgado
Publisher :
ISBN 13 : 9781088301210
Total Pages : 84 pages
Book Rating : 4.3/5 (12 download)

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Book Synopsis Electrical and Thermal Characterization of Low Dimensional Materials and Devices by : Ruben A. Salgado

Download or read book Electrical and Thermal Characterization of Low Dimensional Materials and Devices written by Ruben A. Salgado and published by . This book was released on 2019 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-dimensional materials such as quasi-one-dimensional carbon nanotubes and quasi-two-dimensional transition metal dichalcogenides reveal interesting properties, which have potential for future device applications. In some cases, the attractive feature of low-dimensional materials is their heat conduction capabilities, in other cases - it is the unusual electronic conduction and switching phenomena. In this dissertation research, I investigate (i) the thermal characteristics of carbon nanotubes incorporated in the battery electrode; and (ii) the electronic characteristics of quasi-two-dimensional 1T-TaS2 material system and devices based on these systems The selected material systems and different properties demonstrate a wide range of possibilities of the device applications for the low-dimensional materials. In the first part of this dissertation work, I describe the effects of the incorporation of carbon nanotubes, known for their high thermal conductivity, into Li-ion battery electrodes. It was demonstrated that the in-plane thermal conductivity of the composite electrodes with incorporated carbon nanotubes is as large as ~206 W/mK. This value exceeds the thermal conductivity of conventional laminated electrodes by about three orders of magnitude. The cross-plane thermal conductivity of the carbon-nanotube-based electrodes is in the same range as thermal conductivity values of conventional laminated electrodes. The electrodes with carbon nanotubes revealed a superior electrochemical performance and stability. The results of this research demonstrated that incorporation of highly thermally conductive low-dimensional materials can substantially improve the thermal properties of the battery electrodes without degrading their electrochemical performance. In the second part of this dissertation research, I report results of the investigation of current-voltage characteristics and low-frequency current fluctuations in vertical 1T-TaS2 charge-density-wave devices. The electron transport, perpendicular to the atomic planes, was studied in the temperature range below T=180 K, which is a known transition temperature to the commensurate charge-density-wave regime. The resistivity of the vertical 1T-TaS2 devices reveal an intriguing abrupt change below 100 K. The low-frequency noise spectra suggest a presence of an additional "hidden" phase transition at this point. The obtained results confirmed the potential use of low-frequency noise spectroscopy for the investigation of electron transport and switching phenomena in low dimensional materials.

Thermal Transport in Carbon-Based Nanomaterials

Author : Gang Zhang
Publisher : Elsevier
ISBN 13 : 0323473466
Total Pages : 386 pages
Book Rating : 4.3/5 (234 download)

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Book Synopsis Thermal Transport in Carbon-Based Nanomaterials by : Gang Zhang

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

Science and Application of Nanotubes

Author : D. Tománek
Publisher : Springer Science & Business Media
ISBN 13 : 0306470985
Total Pages : 393 pages
Book Rating : 4.3/5 (64 download)

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Book Synopsis Science and Application of Nanotubes by : D. Tománek

Download or read book Science and Application of Nanotubes written by D. Tománek and published by Springer Science & Business Media. This book was released on 2005-12-17 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series of books, which is published at the rate of about one per year, addresses fundamental problems in materials science. The contents cover a broad range of topics from small clusters of atoms to engineering materials and involve chemistry, physics, materials science, and engineering, with length scales ranging from Ångstroms up to millimeters. The emphasis is on basic science rather than on applications. Each book focuses on a single area of current interest and brings together leading experts to give an up-to-date discussion of their work and the work of others. Each article contains enough references that the interested reader can access the relevant literature. Thanks are given to the Center for Fundamental Materials Research at Michigan State University for supporting this series. M. F. Thorpe, Series Editor E-mail: thorpe@pa. msu. edu East Lansing, Michigan V PREFACE It is hard to believe that not quite ten years ago, namely in 1991, nanotubes of carbon were discovered by Sumio Iijima in deposits on the electrodes of the same carbon arc apparatus that was used to produce fullerenes such as the “buckyball”. Nanotubes of carbon or other materials, consisting ofhollow cylinders that are only a few nanometers in diameter, yet up to millimeters long, are amazing structures that self-assemble under extreme conditions. Their quasi-one-dimensional character and virtual absence of atomic defects give rise to a plethora of unusual phenomena.

Carbon Nanotubes: From Basic Research to Nanotechnology

Author : Valentin N. Popov
Publisher : Springer Science & Business Media
ISBN 13 : 9781402045721
Total Pages : 286 pages
Book Rating : 4.0/5 (457 download)

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Book Synopsis Carbon Nanotubes: From Basic Research to Nanotechnology by : Valentin N. Popov

Download or read book Carbon Nanotubes: From Basic Research to Nanotechnology written by Valentin N. Popov and published by Springer Science & Business Media. This book was released on 2006-04-04 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book comprises reviews on various topics of carbon nanotube research from specialists in the field, together with reports on on-going research. Both are intended to give a detailed picture of the remarkable properties of these one-dimensional nanostructures. Particular attention is paid to the synthesis, characterization, properties, and application of nanotubes. The book will be an indispensable introduction for the newcomers in the field as well as a valuable update for researchers in the field, for it contains the most recent developments.

Thermal Transport in Novel Three Dimensional Carbon Nanostructures

Author : Jungkyu Park
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (957 download)

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Book Synopsis Thermal Transport in Novel Three Dimensional Carbon Nanostructures by : Jungkyu Park

Download or read book Thermal Transport in Novel Three Dimensional Carbon Nanostructures written by Jungkyu Park and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional (3D) nanostructures comprised of one-dimensional (1D) and/or two-dimensional (2D) nanomaterials have several advantages over their base nanomaterials. Due to their dimensionally confined structures, for example, 1D carbon nanotubes (CNTs) and 2D graphene exhibit strong direction-dependent thermal transport properties with extremely inefficient cross-plane properties. However, 3D carbon nanostructures such as pillared graphene structures (PGS) are expected to be efficient in both in-plane and cross-plane thermal transport. The aim of this thesis is providing the detailed understanding of thermal transport in 3D carbon nanostructures comprised of CNTs and graphene. Reverse non-equilibrium molecular dynamics simulations were used to show that PGS and CNT networks can have both high in-plane and high cross-plane thermal conductivities comparable to their base nanomaterials, i.e. CNTs and graphene, and also to show that their thermal properties are tunable through altering their architectures. The results indicate that thermal resistances at CNT-graphene junctions result from the combined effect of phonon scattering at the junctions with distorted carbon-carbon bonds and the change in dimensionality of the phonon transport medium as phonons propagate from CNTs (1D) to graphene (2D) and then again to CNT. Moreover, wave packet analysis on SWCNT networks revealed that SWCNT-SWCNT junctions with lager diameter transmit thermal energy more efficiently than the junctions with smaller diameter, and also revealed that SWCNT-SWCNT T-junctions are more efficient in thermal energy transmission than X-junctions. A new experimental method for thermal conductivity measurements in 2D nanosheets was developed. The new method ensures a 1D heat conduction in a 2D sample by creating a spatially uniform temperature profile on the heated side of the sample, and thus improves the accuracy of the measurement in a 2D structure. A MEMS device that can measure the thermal conductivity of a graphene layer using this method is currently being fabricated for the validation of the method.

Industrial Applications of Nanomaterials

Author : Sabu Thomas
Publisher : Elsevier
ISBN 13 : 012815750X
Total Pages : 534 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Industrial Applications of Nanomaterials by : Sabu Thomas

Download or read book Industrial Applications of Nanomaterials written by Sabu Thomas and published by Elsevier. This book was released on 2019-08-12 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial Applications of Nanomaterials explains the industry based applications of nanomaterials, along with their environmental impacts, lifecycle analysis, safety and sustainability. This book brings together the industrial applications of nanomaterials with the incorporation of various technologies and areas, covering new trends and challenges. Significant properties, safety and sustainability and environmental impacts of synthesis routes are also explored, as are major industrial applications, including agriculture, medicine, communication, construction, energy, and in the military. This book is an important information source for those in research and development who want to gain a greater understanding of how nanotechnology is being used to create cheaper, more efficient products. Explains how different classes of nanomaterials are being used to create cheaper, more efficient products Explores the environmental impacts of using a variety of nanomaterials Discusses the challenges faced by engineers looking to integrate nanotechnology in new product development

Thermal Behaviour and Applications of Carbon-Based Nanomaterials

Author : Dimitrios V. Papavassiliou
Publisher : Elsevier
ISBN 13 : 0128176822
Total Pages : 368 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Thermal Behaviour and Applications of Carbon-Based Nanomaterials by : Dimitrios V. Papavassiliou

Download or read book Thermal Behaviour and Applications of Carbon-Based Nanomaterials written by Dimitrios V. Papavassiliou and published by Elsevier. This book was released on 2020-04-15 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocomposites with Carbon-based nanofillers (e.g., carbon nanotubes, graphene sheets and nanoribbons etc.) form a class of extremely promising materials for thermal applications. In addition to exceptional material properties, the thermal conductivity of the carbon-based nanofillers can be higher than any other known material, suggesting the possibility to engineer nanocomposites that are both lightweight and durable, and have unique thermal properties. This potential is hindered by thermal boundary resistance (TBR) to heat transfer at the interface between nanoinclusions and the matrix, and by the difficulty to control the dispersion pattern and the orientation of the nanoinclusions. Thermal Behaviour and Applications of Carbon-Based Nanomaterials: Theory, Methods and Applications explores heat transfer in nanocomposites, discusses techniques predicting and modeling the thermal behavior of carbon nanocomposites at different scales, and methods for engineering applications of nanofluidics and heat transfer. The chapters combine theoretical explanation, experimental methods and computational analysis to show how carbon-based nanomaterials are being used to optimise heat transfer. The applications-focused emphasis of this book makes it a valuable resource for materials scientists and engineers who want to learn more about nanoscale heat transfer. Offers an informed overview of how carbon nanomaterials are currently used for nanoscale heat transfer Discusses the major applications of carbon nanomaterials for heat transfer in a variety of industry sectors Details the major computational methods for the analysis of the thermal properties of carbon nanomaterials

Thermal Transport in Isolated Carbon Nanostructures and Associated Nanocomposites

Author : Nayandeep Kumar Mahanta
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

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Book Synopsis Thermal Transport in Isolated Carbon Nanostructures and Associated Nanocomposites by : Nayandeep Kumar Mahanta

Download or read book Thermal Transport in Isolated Carbon Nanostructures and Associated Nanocomposites written by Nayandeep Kumar Mahanta and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanostructures, namely carbon nanotubes, nanofibers and graphene, owing to their extremely high thermal conductivities, hold promise for use as fillers in materials required for thermal management of electronics. Efficient thermal characterization holds the key to understanding the heat conduction mechanisms in the particular nanostructures and continued development of materials for novel applications. The present work involves development of dedicated techniques for characterization of the thermal conduction in individual carbon nanostructures and nanocomposites. The thermal flash technique developed for characterizing individual nanostructures provides a simple, accurate and reliable means for measuring thermal conductivity while managing to avoid the issues associated with conventional techniques. The thermal conductivities measured for vapor-grown carbon nanofibers and various graphene nanoplatelets were consistent with theoretical estimates based on the fundamentals of heat conduction in solids. Moreover, the results provide valuable evidence to support existing theories for explaining the differences between the various nanoscale manifestations of graphite. The investigation on isolated nanostructures was followed with the development and characterization of epoxy nanocomposites comprising graphite and graphene as fillers with the overarching goal of preparing composites with a thermal conductivity higher than 40 W/m-K. The thermal conductivities measured for some of the nanocomposites using the dual-mode heat flow meter, a steady-state heat technique developed in this work, were higher than the highest reported value in literature. The presence of large graphite flakes in conjunction with small amounts of graphene to reduce the overall thermal interface resistance were the principal reasons behind the extremely high thermal conductivity of 42.4 ± 4.8 W/m-K (nearly 250 times enhancement) for an epoxy composite with 30 wt% of graphite and 5 wt% of graphene.

Thermal Behaviour and Applications of Carbon-Based Nanomaterials

Author : Dimitrios V. Papavassiliou
Publisher : Elsevier
ISBN 13 : 0128176830
Total Pages : 370 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Thermal Behaviour and Applications of Carbon-Based Nanomaterials by : Dimitrios V. Papavassiliou

Download or read book Thermal Behaviour and Applications of Carbon-Based Nanomaterials written by Dimitrios V. Papavassiliou and published by Elsevier. This book was released on 2020-04-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocomposites with Carbon-based nanofillers (e.g., carbon nanotubes, graphene sheets and nanoribbons etc.) form a class of extremely promising materials for thermal applications. In addition to exceptional material properties, the thermal conductivity of the carbon-based nanofillers can be higher than any other known material, suggesting the possibility to engineer nanocomposites that are both lightweight and durable, and have unique thermal properties. This potential is hindered by thermal boundary resistance (TBR) to heat transfer at the interface between nanoinclusions and the matrix, and by the difficulty to control the dispersion pattern and the orientation of the nanoinclusions. Thermal Behaviour and Applications of Carbon-Based Nanomaterials: Theory, Methods and Applications explores heat transfer in nanocomposites, discusses techniques predicting and modeling the thermal behavior of carbon nanocomposites at different scales, and methods for engineering applications of nanofluidics and heat transfer. The chapters combine theoretical explanation, experimental methods and computational analysis to show how carbon-based nanomaterials are being used to optimise heat transfer. The applications-focused emphasis of this book makes it a valuable resource for materials scientists and engineers who want to learn more about nanoscale heat transfer. Offers an informed overview of how carbon nanomaterials are currently used for nanoscale heat transfer Discusses the major applications of carbon nanomaterials for heat transfer in a variety of industry sectors Details the major computational methods for the analysis of the thermal properties of carbon nanomaterials

High Thermal Conductivity Materials

Author : Subhash L. Shinde
Publisher : Springer Science & Business Media
ISBN 13 : 0387251006
Total Pages : 285 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis High Thermal Conductivity Materials by : Subhash L. Shinde

Download or read book High Thermal Conductivity Materials written by Subhash L. Shinde and published by Springer Science & Business Media. This book was released on 2006-01-31 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this book is to cover the basic understanding of thermal conduction mechanisms in various high thermal conductivity materials including diamond, cubic boron nitride, and also the latest material like carbon nanotubes. The book is intended as a good reference book for scientists and engineers involved in addressing thermal management issues in a broad spectrum of industries. Leading researchers from industry and academic institutions who are well known in their areas of expertise have contributed a chapter in the field of their interest.

Nanotechnologies. Characterization of Single-Wall Carbon Nanotubes Using Thermogravimetric Analysis

Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580613883
Total Pages : 34 pages
Book Rating : 4.6/5 (138 download)

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Book Synopsis Nanotechnologies. Characterization of Single-Wall Carbon Nanotubes Using Thermogravimetric Analysis by : British Standards Institute Staff

Download or read book Nanotechnologies. Characterization of Single-Wall Carbon Nanotubes Using Thermogravimetric Analysis written by British Standards Institute Staff and published by . This book was released on 1911-11-30 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology, Nanomaterials, Carbon, Nanotubes, Tubular shape, Thermogravimetric analysis, Thermal analysis, Chemical analysis and testing, Purity, Thermal stability, Homogeneity

Template Directed Fabrication and Characterization of 1D Nanostructures for Nanoelectronics

Author : Muhammad Ibrahim Khan
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.3/5 (121 download)

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Book Synopsis Template Directed Fabrication and Characterization of 1D Nanostructures for Nanoelectronics by : Muhammad Ibrahim Khan

Download or read book Template Directed Fabrication and Characterization of 1D Nanostructures for Nanoelectronics written by Muhammad Ibrahim Khan and published by . This book was released on 2008 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

On the Path to Carbon-based Electronics

Author : Joshua Steven Walker
Publisher :
ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.5/5 (381 download)

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Book Synopsis On the Path to Carbon-based Electronics by : Joshua Steven Walker

Download or read book On the Path to Carbon-based Electronics written by Joshua Steven Walker and published by . This book was released on 2021 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-wall carbon nanotubes (SWCNTs) are high aspect ratio, one-dimensional (1D), cylindrical nanocrystals with exemplary anisotropic optical, thermal, mechanical, chemical, and magnetic properties. These behaviors are typically observed on the single-nanotube (NT) scale and often reveal a strong anisotropic response along the axis of the SWCNT. Researchers have exploited new chemical processing techniques to further enhance the physical response of SWCNTs by selectively controlling nanotube metallicity, length, diameter, and handedness. Despite the strong technological promise of these tailored SWCNTs, their incorporation into current state-of-the-art technological platforms, such as field-effect transistors, far-infrared detectors, broadband optical polarizers, and ultrafast laser modulators, has been greatly hindered by the inability to easily produce ensembles of aligned SWCNTs after solution-based chemical processing. To overcome this transition, a facile and reproducible method for fabricating aligned SWCNTs from a processed solution is necessary. In this dissertation, I will first briefly introduce low-dimensional carbon allotropes with a specific focus on SWCNTs and nanotube alignment techniques. In particular, I cover several chemical purification advancements that improve the purity of highly mixed SWCNT dispersions. Next, I discuss the methods utilized throughout this body of work and how they pertain to recent advances in aligning SWCNTs via slow vacuum filtration (SVF). Specifically, I describe the technological development of automating and refining the SVF process via machine vision, as well as the addition of new capabilities. For instance, by controlling the filtration flow rate, flattening the meniscus, and modifying the filter membrane surface, I could repeatably produce globally aligned SWCNT films with high, two-dimensional nematic ordering ($\mstwod > 0.9$). Additionally, I propose a hypothesis for the alignment mechanism and show, via alterations to the ionic strength of the solution, that electrostatic interactions are necessary for the emergence of a nematic phase. The observations made here, as well as the hypothesized alignment mechanism, suggest a pathway forward for not only aligning solution-dispersed SWCNTs but also a wide variety of 1D nanoparticles.