Download or read book Synthesis Characterization and Field Emission Properties of Ultra Long Aligned Multiwall Carbon Nanotubes Grown Using Chemical Vapor Deposition written by Herbert A. Vinson and published by . This book was released on 2013 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aligned Carbon Nanotubes written by Zhifeng Ren and published by Springer Science & Business Media. This book was released on 2012-09-05 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a survey of the physics and fabrication of carbon nanotubes and their applications in optics, electronics, chemistry and biotechnology. It focuses on the structural characterization of various carbon nanotubes, fabrication of vertically or parallel aligned carbon nanotubes on substrates or in composites, physical properties for their alignment, and applications of aligned carbon nanotubes in field emission, optical antennas, light transmission, solar cells, chemical devices, bio-devices, and many others. Major fabrication methods are illustrated in detail, particularly the most widely used PECVD growth technique on which various device integration schemes are based, followed by applications such as electrical interconnects, nanodiodes, optical antennas, and nanocoax solar cells, whereas current limitations and challenges are also be discussed to lay the foundation for future developments.
Download or read book Synthesis and Field Emission Properties of Carbon Nanotube Films written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, vertically aligned multiwalled carbon nanotube films were grown by microwave plasma chemical vapor deposition (MWCVD). Through controlling the thickness of the iron thin film, carbon nanotubes with different diameters were obtained. When the thickness of the iron layer was reduced to 0.3-0.5 nm, single-wall and double-wall nanotubes were obtained with a high areal density (~ 1012/cm2) and vertical alignment. Scanning electron microscopy, Raman spectroscopy and high resolution transmission electron microscopy were employed to characterize the as-deposited nanotubes. In addition, a systematic study of the internal structure transition of the carbon nanotubes has been conducted and a growth model was proposed in terms of carbon surface and bulk diffusion. The field emission of the carbon nanotube films has also been explored in this study. Different measurement systems including a variable distance field emission system, a field emission imaging system, and a field electron emission system (FEEM) were employed. The effects of the diameter (multi-wall vs single- and double- wall), the adsorbates, and the temperature on the field emission properties of carbon nanotubes have been exhibited. Finally, two processes including hydrogen plasma etching and re-growth were used to treat the as-deposited film, and an increased emission site density was observed for the re-grown carbon nanotube film.
Download or read book Carbon Nanotubes written by Siva Yellampalli and published by BoD – Books on Demand. This book was released on 2011-07-20 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes are one of the most intriguing new materials with extraordinary properties being discovered in the last decade. The unique structure of carbon nanotubes provides nanotubes with extraordinary mechanical and electrical properties. The outstanding properties that these materials possess have opened new interesting researches areas in nanoscience and nanotechnology. Although nanotubes are very promising in a wide variety of fields, application of individual nanotubes for large scale production has been limited. The main roadblocks, which hinder its use, are limited understanding of its synthesis and electrical properties which lead to difficulty in structure control, existence of impurities, and poor processability. This book makes an attempt to provide indepth study and analysis of various synthesis methods, processing techniques and characterization of carbon nanotubes that will lead to the increased applications of carbon nanotubes.
Download or read book Carbon Nanotubes written by Michael J. O’Connell and published by CRC Press. This book was released on 2018-10-03 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their discovery more than a decade ago, carbon nanotubes (CNTs) have held scientists and engineers in captive fascination, seated on the verge of enormous breakthroughs in areas such as medicine, electronics, and materials science, to name but a few. Taking a broad look at CNTs and the tools used to study them, Carbon Nanotubes: Properties and Applications comprises the efforts of leading nanotube researchers led by Michael O’Connell, protégé of the late father of nanotechnology, Richard Smalley. Each chapter is a self-contained treatise on various aspects of CNT synthesis, characterization, modification, and applications. The book opens with a general introduction to the basic characteristics and the history of CNTs, followed by discussions on synthesis methods and the growth of “peapod” structures. Coverage then moves to electronic properties and band structures of single-wall nanotubes (SWNTs), magnetic properties, Raman spectroscopy of electronic and chemical behavior, and electromechanical properties and applications in NEMS (nanoelectromechanical systems). Turning to applications, the final sections of the book explore mechanical properties of SWNTs spun into fibers, sidewall functionalization in composites, and using SWNTs as tips for scanning probe microscopes. Taking a fresh look at this burgeoning field, Carbon Nanotubes: Properties and Applications points the way toward making CNTs commercially viable.
Download or read book Perspective of Carbon Nanotubes written by Hosam El-Din Saleh and published by BoD – Books on Demand. This book was released on 2019-12-11 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes belong to new nanomaterials and have been known for almost 20 years, but their history is somewhat lengthier. They have been identified as promising candidates for various applications.High-temperature preparation techniques are conventional techniques for the synthesis of carbon nanotubes using arc discharge or laser ablation, but today these methods are being replaced by low-temperature vapor deposition techniques, since orientation, alignment, nanotube length, diameter, purity, and density of carbon nanotubes can be precisely controlled. The synthesis of carbon nanotubes by chemical vapor deposition on catalyst arrays leads to nanotube models grown from specific sites on surfaces. The controlled synthesis of nanotubes opens up interesting possibilities in nanoscience and nanotechnologies, including electrical, mechanical and electromechanical properties and devices, chemical functionalization, surface chemistry and photochemistry, molecular sensors, and interfacing with moderate biological systems.Carbon nanotubes are used in many applications due to their unique electrical, mechanical, optical, thermal, and other properties. Conductive and high-strength composite materials, energy saving and energy conversion devices, sensors, visualization of field emissions and sources of radiation, means for storing hydrogen, and nanoscale semiconductor devices, probes, and interconnections are some of the many applications of carbon nanotubes.
Download or read book Carbon Nanotubes written by Charan Masarapu and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation covers several diverse and novel aspects of carbon nanotubes (CNTs) related to synthesis, properties and perspective applications in devices. Growth of CNTs on electrically conductive substrates is promising for many applications. However, the lack of complete knowledge of the substrate effects on the CNT growth poses many technical challenges. The mechanism for the growth of aligned multiwall carbon nanotubes (MWNTs) directly on chemically treated stainless steel (type 304) using a chemical vapor deposition process (CVD) is unveiled through detailed X-ray photoelectron spectroscopy (XPS) analysis. It is found that the CNTs prefer to grow on the enriched surface of iron oxides obtained by the chemical treatment rather than on the passive chromium oxide films generally present on the surface of the as-received stainless steel substrates. According to the XPS peak fitting results, to obtain high density aligned MWNTs, the ratio of iron oxide to chromium oxide on the surface of stainless steel should be much greater than one. Based on this growth mechanism, for the first time, site selective MWNT synthesis on stainless substrate is demonstrated. This kind of controlled CNT growth on conducting substrate results in very promising, diverse applications of CNTs in futuristic nanodevices. Understanding the physical properties of MWNTs, such as the specific heat at low temperature, leads to developing more efficient CNT based temperature sensors and thermal devices. In this regard, the specific heat of an aligned bulk MWNT sample peeled from SiO 2 substrate is measured from 300 K to 1.8 K. The dimensional behavior of the specific heat curve at different temperature ranges is accurately analyzed. Interestingly, a T 2 dependence of the specific heat is observed below 5 K, suggesting a nuclear hyperfine component pertaining to the Schottky effect. This effect arises from the magnetic impurities in the MWNTs, whose presence is confirmed by thermogravimetric analysis and microscopy observations. The final goal of synthesizing the CNTs is for a purposeful application, where the properties of the CNTs can be effectively utilized. CNTs are excellent field emitters and have good high temperature stability. A field emission diode for high temperature operation with aligned MWNTs synthesized on SiO 2 substrate is demonstrated for the first time. The diode showed stable performance from 25 °C all the way up to 300 °C, without any significant change in the diode parameters both in the forward and reverse bias. Such kind of diode is very useful in electronic devices employed in extreme temperature environments for down-hole drilling, seismographic and space applications. CNTs have attracted a lot of attention as electrode materials in electrochemical energy storage devices due to their porous structure and high surface area. The success of the aligned MWNT synthesis directly on the conducting substrate stainless steel provided the opportunity to test the MWNTs as anode material in rechargeable lithium ion battery. The assembled cell showed amazing performance at a high charge-discharge rate (1C rate) with a marked increase in the specific capacitance with continuous charge-discharge cycling. The increase in the specific capacitance with cycling is attributed to the combined effect of the gradual MWNT structural changes and the contribution of the stainless steel substrate which is actually acting as a current collector in Li ion intercalation process. An increase in the specific capacitance with cycling means the lifetime of the battery increases with usage which is extraordinary for any electronic device powered by rechargeable lithium ion batteries. Electrochemical power sources that offer high energy and power densities and can also withstand a harsh temperature environment have become extremely desirable in applications ranging from hybrid electric vehicles to military weapons. In this regard, a supercapacitor coin cell with singlewall carbon nanotube (SWNT) film electrodes and polypropylene carbonate organic electrolyte is assembled and tested in the temperature range from 25 °C to 100 °C. Repeated electrochemical measurements - cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge discharge, performed at 25 °C and 100 °C with continuous heating and cooling showed very consistent performance without any cell degradation. Cyclic voltammograms displayed ideal capacitive behavior even at a significant scan rate of 1000 mV/s at 25 °C and 100 °C. The ability of the cell to undergo several tens of thousands of galvanostatic charge-discharge cycles at 100 °C and still work normally when cooled back to 25 °C is highly exceptional. Also, the cell is able to withstand current densities as high as 100 A/g during the galvanostatic charge-discharge yielding eminent power densities. The charge-discharge study at 25 °C with a current density of 20 A/g up to 264700 cycles showed excellent capacitance stability. The usage of such a supercapacitor potentially enables far-reaching advances in back-up energy storage and high pulse power applications. (Abstract shortened by UMI.).
Download or read book Carbon Nanotube Science written by Peter J. F. Harris and published by Cambridge University Press. This book was released on 2009-03-19 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides coverage of all of the important aspects of carbon nanotube research, including synthesis, properties and potential applications.
Download or read book Nanotube Superfiber Materials written by Mark Schulz and published by William Andrew. This book was released on 2013-09-16 with total page 861 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotube Superfiber Materials refers to different forms of macroscale materials with unique properties constructed from carbon nanotubes. These materials include nanotube arrays, ribbons, scrolls, yarn, braid, and sheets. Nanotube materials are in the early stage of development and this is the first dedicated book on the subject. Transitioning from molecules to materials is a breakthrough that will positively impact almost all industries and areas of society. Key properties of superfiber materials are high flexibility and fatigue resistance, high energy absorption, high strength, good electrical conductivity, high maximum current density, reduced skin and proximity effects, high thermal conductivity, lightweight, good field emission, piezoresistive, magnetoresistive, thermoelectric, and other properties. These properties will open up the door to dozens of applications including replacing copper wire for power conduction, EMI shielding, coax cable, carbon biofiber, bullet-proof vests, impact resistant glass, wearable antennas, biomedical microdevices, biosensors, self-sensing composites, supercapacitors, superinductors, hybrid superconductor, reinforced elastomers, nerve scaffolding, energy storage, and many others. The scope of the book covers three main areas: Part I: Processing; Part II: Properties; and Part III: Applications. Processing involves nanotube synthesis and macro scale material formation methods. Properties covers the mechanical, electrical, chemical and other properties of nanotubes and macroscale materials. Different approaches to growing high quality long nanotubes and spinning the nanotubes into yarn are explained in detail. The best ideas are collected from all around the world including commercial approaches. Applications of nanotube superfiber cover a huge field and provides a broad survey of uses. The book gives a broad overview starting from bioelectronics to carbon industrial machines. - First book to explore the production and applications of macro-scale materials made from nano-scale particles - Sets out the processes for producing macro-scale materials from carbon nanotubes, and describes the unique properties of these materials - Potential applications for CNT fiber/yarn include replacing copper wire for power conduction, EMI shielding, coax cable, carbon biofiber, bullet-proof vests, impact resistant glass, wearable antennas, biomedical microdevices, biosensors, self-sensing composites, supercapacitors, superinductors, hybrid superconductor, reinforced elastomers, nerve scaffolding, energy storage, and many others
Download or read book Growth and Characterization of Carbon Nanotubes Grown Via Chemical Vapor Deposition written by Christian Peter Deck and published by . This book was released on 2004 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Nanotubes written by Mohammed Rahman and published by BoD – Books on Demand. This book was released on 2018-04-26 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book Carbon Nanotubes - Recent Progress contains a number of recent researches on synthesis, growth, characterization, development, and potential applications on carbon materials especially CNTs in nanoscale. It is a promising novel research from top to bottom that has received a lot of interest in the last few decades. It covers the advanced topics on the physical, chemical, and potential applications of CNTs. Here, the interesting reports on cutting-edge science and technology related to synthesis, morphology, control, hybridization, and prospective applications of CNTs are concluded. This potentially unique work offers various approaches on the R
Download or read book Carbon Nanotubes written by Ado Jorio and published by Springer Science & Business Media. This book was released on 2007-12-18 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of its predecessor, Carbon Nanotubes: Synthesis, Structure, Properties and Applications, this second volume focuses on those areas that have grown rapidly in the past few years. Contributing authors reflect the multidisciplinary nature of the book and are all leaders in their particular areas of research. Among the many topics they cover are graphene and other carbon-like and tube-like materials, which are likely to affect and influence developments in nanotubes within the next five years. Extensive use of illustrations enables you to better understand and visualize key concepts and processes.
Download or read book Carbon Nanotubes and Related Structures written by Dirk M. Guldi and published by John Wiley & Sons. This book was released on 2010-01-26 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the most prominent experts and pioneers in the field, this ready reference combines fundamental research, recent breakthroughs and real-life applications in one well-organized treatise. As such, both newcomers and established researchers will find here a wide range of current methods for producing and characterizing carbon nanotubes using imaging as well as spectroscopic techniques. One major part of this thorough overview is devoted to the controlled chemical functionalization of carbon nanotubes, covering intriguing applications in photovoltaics, organic electronics and materials design. The latest research on novel carbon-derived structures, such as graphene, nanoonions and carbon pea pods, round off the book.
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 2006-04-03 with total page 284 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.
Download or read book Synthesis of Carbon Nanotubes by Chemical Vapor Deposition and Processing of Epoxy Nanocomposites written by and published by . This book was released on 2006 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNT) constitute a new class of materials discovered in 1991 by Sumio Iijima that present unusual mechanical, electrical and thermal properties. Chemical Vapor Deposition (CVD) is the most promising synthesis route for producing large quantities of carbon nanotubes at a low cost. The first part of this thesis focuses on surface synthesis of high purity aligned carbon nanotubes using the CVD technique. High purity single wall and multi wall carbon nanotubes were grown using different substrates and catalysts. The substrates include non porous silicon substrates, porous silicon substrates, stainless steel substrates, stainless steel wires, and silicon cantilevers. The catalysts include molybdenum supported cobalt and alumina supported iron liquid catalysts, and iron and molybdenum catalysts deposited using e-beam evaporation and photolithographic techniques. Vertically aligned single wall and multi wall carbon nanotube forests were grown using the Easy Tube nanofurnace based on the CVD mechanism. The maximum length of the nanotubes grown was almost one millimeter and the diameters ranged from 1 to 100 nanometers. The nanotubes have a large surface area to volume ratio and a high electrochemical sensitivity. These properties may be useful for many applications such as reinforcing polymer composites, drug delivery, biomedical implants, neural imaging, development of biosensors for cancer detection, and other medical applications such as sensing and treating disorders like Epilepsy, Parkinson's disease, and Alzheimer's disease. Since nanotubes are proposed to be used for many biomedical applications, it becomes very important to understand the hazards of nanotubes and nanotechnology. Hence this thesis also presents a short overview of the toxicity of nanotubes. Carbon nanotube and nanofiber reinforced polymer composites have received tremendous amount of attention due to their interesting mechanical, electrical and thermal properties and potential applications. These composites potentially offer high stiffness, high strength, low electrical resistivity, dimensional stability, and light weight. Harnessing the unique physical properties of carbon nanostructures in materials applications has yet to be fully realized. The second part of this thesis mainly deals with improving the properties of composites using carbon nanofibers as fillers in an epoxy matrix. The single most important factor influencing use of carbon nanofibers as reinforcing fibers in polymer composites is their ability to effectively transfer the applied load in the matrix. The effective utilization of nanofibers in composites for structural applications depends strongly on the ability to disperse the nanofibers homogeneously in the matrix without damaging them. To be successfully used for enhancing the properties of composites, good interfacial bonding is required to achieve load transfer across the nanofiber-polymer interface. Hence, two main problems which arise in improving the properties are poor dispersion of the fibers in the composite and weak bonding between fibers and the matrix. These problems are attacked in this thesis by mechanical and chemical means. Solvent free functionalization, controlled sonication, high speed shear mixing at elevated temperatures, and high pressure casting are used to exfoliate the nanofibers in the epoxy. Pyrograf and CleanTech carbon nanofibers, which are similar to large diameter multi-wall carbon nanotubes, were used as filler materials in processing of composites. Incorporating 5 percentage by weight Pyrograf carbon nanofibers resulted in improvement of stiffness of the composite by about 45 percentage by weight and incorporating 5 percentage by weight CleanTech carbon nanofibers resulted in improvement of stiffness of the composite by 20 percentage by weight when compared to plain epoxy with out any nanofibers.
Download or read book Roses In The Snow written by David McClellan and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dave McClellan met Marie when she was 14 and he, 16. He lost her 42 years later. Cancer.In the days and months that followed, McClellan frequently posted on Facebook, where his grieving process was chronicled in real time. He cycled through pain, despair, boredom, guilt, anger, and hope. Followers, moved by his candor, suggested that a compilation might help other widows or people experiencing similar grief.In this book, McClellan shares the poems and heartfelt prose he wrote as he returned to work, saw his family dynamics change, made decisions that cost him friends and reckoned with God. He experienced frustration, sadness, and yes, the return of joyful moments -- like roses poking through the snow. Recommended for surviving spouses or anyone seeking comfort after a loss.
Download or read book Multi Walled Carbon Nanotubes written by Simone Morais and published by . This book was released on 2019 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their discovery, multi-walled carbon nanotubes (MWCNTs) have received tremendous attention due to their unique electrical, optical, physical, chemical, and mechanical properties. Remarkable advances have been made in the synthesis, purification, structural characterization, functionalization, and application of MWCNTs. Their particular characteristics make them well suited for a plethora of applications in a number of fields, namely nanoelectronics, nanofluids, energy management, (electro)catalysis, materials science, construction of (bio)sensors based on different detection schemes, multifunctional nanoprobes for biomedical imaging, and sorbents for sample preparation or removal of contaminants from wastewater. They are also useful as anti-bacterial agents, drug delivery nanocarriers, etc. The current relevant application areas are countless. This Special Issue presents original research and review articles that address advances, trends, challenges, and future perspectives regarding synthetic routes, structural features, properties, behaviors, and industrial or scientific applications of MWCNTs in established and emerging areas.
