Download or read book Synthesis And Characterization Of Silicon Doped Single Walled Carbon Nanotubes written by John Slimak and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon doping of carbon nanotubes produces an isovalent structure, unlike that of similar boron or nitrogen doped tubes which display p- and n- characteristics, and causes unique structural changes to the nanotubes, altering the properties of both single tubes and bulk materials. Silicon doped single-walled nanotubes were prepared by chemical vapor deposition of ethanol vapor with catalytic ferrocene and methoxytrimethylsilane dopant. The material was characterized by Raman spectroscopy to determine the success of the synthesis and also to probe the diameter of the nanotubes; the presence of subsitutional silicon atoms in the nanotube lattice create a preference for lower diameter tubes, a change that is easily observable through the radial breathing mode of the doped nanotubes.

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 Synthesis and Characterization of 3 dimensional Networks of Different Nanocarbons written by Lakshmy Pulickal Rajukumar and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs) exhibit unique optical, thermal, electrical and mechanical properties. Even though they have been around for more than two decades, there are still many challenges related to the viability of using them for practical applications. One of the main challenges is to engineer their assembly via covalent interconnections to produce macro-scale structures. The first part of this thesis describes recent findings related to a novel and innovative synthesis approach for synthesizing three-dimensional (3-D) CNT networks. In particular, this approach consists of fabricating 3-D covalently interconnected multi-walled carbon nanotubes (MWNTs) with silicon carbide (SiC) nano- and micro-particles. The material was synthesized by a two-step process involving the coating of MWNTs with silicon oxide (SiOx) via chemical routes, followed by spark plasma sintering (SPS). SPS enables the use of high temperatures and mechanical pressures, which are required for the carbothermal reduction of silica and the densification of the material into 3-D composite blocks. Covalent interconnections of MWNTs are created by a carbon diffusion process resulting in SiC formation. Interestingly, the 3-D MWNT composite exhibits high thermal conductivity values (16.72 W m-1 K-1); up to two orders of magnitude higher than comparable nanocarbon-based materials. From an electrical point of view, this material exhibits a semiconducting behavior with an electron hopping mechanism associated to 3-D variable range hopping (VRH). Our findings demonstrate that it is possible to fabricate macro-scale MWNT-based composites with enhanced physical properties from covalent interconnections.It is well known that varying growth conditions and precursor compositions drastically change the structural, physical and electronic properties of CNTs (multi- and single-walled). Elemental doping of CNTs was also explored in thesis, in an effort to establish covalent interconnections between CNTs. The structure-property changes induced by doping were also carefully analyzed and studied. The synthesis of single-walled carbon nanotubes (SWNTs) doped with silicon (Si) is reported in Chapter 3 of this thesis. It was found that depending on the Si concentration, the bundle electronic transport of SWNTs could be tuned. The Si doped SWNT (Si-SWNTs) samples were grown using an aerosol assisted chemical vapor deposition (AACVD) approach. A detailed analysis of the Raman spectra and radial breathing modes (RBMs) of Si-SWNTs led to the conclusion that the diameter of SWNTs is reduced after Si doping. Experimental transport measurements revealed drastic changes in the electrical resistivity of Si-SWNTs when compared to pristine SWNTs. The roles of sulfur and boron during the growth of MWNTs were also explored in this study. These elemental dopants were responsible for significant changes in the nanotube morphology and electronic properties. For example, boron doping induced the formation of elbow-like junctions on the MWNTs and entangled MWNTs networks, exhibiting a sponge-like texture. In addition, 3-D branched tentacle-like structures with numerous covalent junctions were synthesized by adding very small amounts (

Download or read book Carbon Nanotubes Synthesis Characterization and Applications written by Kamal K. Kar and published by Research Publishing Service. This book was released on 2011 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Single walled Carbon Nanotubes and Characterization of Nanotube based Field effect Transistors written by Woong Kim and published by . This book was released on 2005 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 and Characterization of Single walled Carbon Nanotubes by Dual Laser Vaporization written by Mathew Kisten Moodley and published by . This book was released on 2010 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Single Walled Carbon Nanotubes written by Yan Li and published by Springer. This book was released on 2019-05-16 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.

Download or read book Synthesis and Characterization of Ultra small Single walled Carbon Nanotubes Produced Via Template Technique written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Xxii, 176 leaves : ill. ; 30 cm.

Download or read book Carbon Meta Nanotubes written by Marc Monthioux and published by John Wiley & Sons. This book was released on 2011-10-27 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Meta-Nanotubes are a new generation of carbon nanotubes (CNTs) which result from the chemical transformation of regular CNTs and their subsequent combination with foreign materials (atoms, molecules, chemical groups, nanocrystals) by various ways such as functionalisation, doping, filling, and substitution. These new nanomaterials exhibit enhanced or new properties, such as reactivity, solubility, and magnetism, which pristine CNTs do not possess. Their many applications include electronic and optoelectronic devices, chemical and biosensors, solar cells, drug delivery, and reinforced glasses and ceramics. Carbon Meta-Nanotubes: Synthesis, Properties and Applications discusses these third generation carbon nanotubes and the unique characteristics they possess. Beginning with a general overview of the subject, this book covers the five main categories of meta-nanotubes, namely: Doped Carbon Nanotubes Functionalised Carbon Nanotubes Decorated or Coated Carbon Nanotubes Filled Carbon Nanotubes Heterogeneous Nanotubes Providing unparalleled coverage of these third generation or meta-nanotubes, and possibilities for future development, this book is essential for anyone working on carbon nanotubes.

Download or read book Deterministic and Preferential Synthesis of Single walled Carbon Nanotubes written by Yiming Li and published by . This book was released on 2004 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Water Soluble Single Walled Carbon Nanotubes Graft Substituted Ionic Polyacetylenes written by Dae Kyom Kim and published by . This book was released on 2006 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Nickel coated Single walled Carbon Nanotubes and Polymeric Nanocomposites written by Jenny Luyen Phan and published by . This book was released on 2009 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Single Walled Carbon Nanotubes written by Melorina Dolafi Rezaee and published by American Chemical Society. This book was released on 2023-08-01 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-walled carbon nanotubes (SWCNTs) are cylindrical one-dimensional nanomaterials made of single-layered graphene sheets. They possess unique properties because of their specific structure. Due to their distinct electronic structure and impressive thermal, mechanical, and optical properties, SWCNTs have great applications in biomedicine, energy storage, nanomechanical devices, etc. So far, many methods have been developed to synthesize SWCNTs. Despite the great achievements in the synthesis and applications of SWCNTs in the past few decades, many challenges remain. This primer will equip the reader with a foundational understanding of the growth mechanisms of SWCNTs and the advantages and disadvantages of the process and growth conditions of the various techniques. The reader will also learn how to relate the properties and structure of these materials to their specific functionality in the desired application.

Download or read book Doping of Carbon Nanotubes written by Sergey Bulyarskiy and published by Springer. This book was released on 2017-07-01 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the control of electronic properties of carbon nanotubes. It presents thermodynamic calculations of the formation of impurities and defects in the interaction of nanotubes with hydrogen, oxygen, nitrogen and boron, based on theoretical models of the formation of defects in carbon nanotubes. It is shown that doping and adsorption lead to changes in the electronic structure of the tubes as well as to the appearance of impurity states in the HOMO-LUMO gap. The book presents examples of specific calculations for doping of carbon nanotubes with oxygen, hydrogen, nitrogen and boron, together with numerous experimental results and a comparison with the author’s thermodynamic calculations. Possible directions of the technological processes of optimization are pointed out, as well as the perspectives of p-n-transition creation with the help of carbon nanotube arrays. The results presented were derived from the physics of the processes and a theoretical model of the technological processes. Though a wealth of empirical information on doping nanotubes has been accumulated in the scientific literature, what is lacking is a theoretical model for their analysis. As such, the book develops a thermodynamic model of the self-organization of structural elements in multicomponent systems – including carbon nanotubes, clusters and precipitates in condensed matter – and subsequently adapts it to the doping of carbon nanotubes. This approach allows readers to gain a far deeper understanding of the processes of doping carbon nanotubes.

Download or read book Advanced Processing and Manufacturing Technologies for Nanostructured and Multifunctional Materials Volume 35 Issue 6 written by Tatsuki Ohji and published by John Wiley & Sons. This book was released on 2015-01-29 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 170 contributions (invited talks, oral presentations, and posters) were presented by participants from universities, research institutions, and industry, which offered interdisciplinary discussions indicating strong scientific and technological interest in the field of nanostructured systems. This issue contains 23 peer-reviewed papers that cover various aspects and the latest developments related to nanoscaled materials and functional ceramics.

Download or read book Electronic Characterization of Individual Single Walled Carbon Nanotubes written by Chi-Yan Wong and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Electronic Characterization of Individual Single-walled Carbon Nanotubes" by Chi-yan, Wong, 王志仁, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled ELECTRONIC CHARACTERIZATION OF INDIVIDUAL SINGLE-WALLED CARBON NANOTUBES Submitted by Wong Chi Yan for the Degree of Master of Philosophy at The University of Hong Kong in September 2007 The outstanding properties of carbon nanotubes (CNTs) have attracted con- siderable research effort in the last decade. CNTs are quasi-one-dimensional materials which can be used to study fundamental quantum effects of one- dimensional systems. TherehasbeenagreatdealofinterestspecificallyinsemiconductingCNTs, which have shown to be promising candidates as the building blocks for the next-generation electronic applications. Carbon nanotube electronic devices have the potential to replace conventional silicon-based counterparts. How- ever, there are still obstacles that remain with regard to the scientific study or application oriented researches. For example, the growth orientation and the band gaps of individual CNTs are difficult to control. In addition, pronounced low-frequency current fluctuation, 1/f noise, exists. The measured noise levelisevencomparabletothesignallevelundersomecircumstances, therebylimit- ing the application of CNTs in low-signal electronics and the overall reliability of CNT based devices. In this thesis, single-walled CNTs (SWNTs) were chosen as a studying modelduetotheirsimplicityinnature. DifferentmethodsofindividualSWNT fieldeffecttransistor(FET)fabricationmethodswerecompared. Themethods included: (I) Directed growth of ultra long SWNTs on a wafer by CVD using ethanol, and (II) Dispersing the SWNTs fabricated by ordinary CVD, on the wafer with organic solvents. The noise behavior for both fabrication methods were characterized by DAQ and lock-in noise measurement methods. Thereafter, thebasicI-V measurementsoffabricatedSWNTFETdevices were also performed. The hysteresis effect and its time dependent measure- ments in FETs were illustrated. The measurements results suggested that the hysteresis effect in nanotube devices was attributed to the charge traps in the oxide layer of FETs. Finally, the 1/f noise of SWNT FETs was studied. It was shown that the 1/f noise arose from the carrier number fluctuations rather than mobility fluctuations, as a superposition of Lorentzian fluctuation spectra. The corre- -2 sponding Hooge constant was found to be gate dependent and about 10 in thelinearregime. Bycomparingwiththereportedsimulationresultofrandom telegraphsignal(RTS)noiseamplitudeinsubthresholdregime, itwasproposed that such Lorentzian fluctuation spectra were due to the RTS noise, arising from the gate potential fluctuations in the CNT, and the charge exchange be- tween CNT and oxide layer. These potential fluctuations were attributed to trapped charges in the oxide nearby which changed the number of carriers in the CNTs. DOI: 10.5353/th_b3955704 Subjects: Nanotubes Nanostructured materials - Electric properties Transistors