Relevant bibliographies by topics / METALLIC CARBON NANOTUBES

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Academic literature on the topic 'METALLIC CARBON NANOTUBES'

Author: Grafiati
Published: 11 September 2023

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Journal articles on the topic "METALLIC CARBON NANOTUBES"

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Dadashyan L.H., Trofimov R.R., Konobeeva N.N., and Belonenko M.B. "Extremely short pulses in an anisotropic optical medium containing carbon nanotubes with metal conduction." Optics and Spectroscopy 130, no. 12 (2022): 1587. http://dx.doi.org/10.21883/eos.2022.12.55246.49-22.

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In this work, we study the interaction of extremely short pulses with a nonlinear anisotropic optical medium with carbon nanotubes (armchair and zigzag type) with metallic conductivity. The dependence of the pulse shape, width, and intensity on the nanotube chirality indices is analyzed. The most appropriate type of carbon nanotubes is substantiated for providing localized propagation of an electromagnetic field in a medium with anisotropic properties. Keywords: optical anisotropy, extremely short pulse, carbon nanotubes, metallic conduc.
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HIEU, NGUYEN NGOC, and NGUYEN PHAM QUYNH ANH. "ELECTRONIC BAND STRUCTURE OF CARBON NANOTUBES WITH QUINOID STRUCTURE." Modern Physics Letters B 27, no. 25 (September 23, 2013): 1350179. http://dx.doi.org/10.1142/s0217984913501790.

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In this paper, we fully describe the geometry of atomic structure of carbon nanotube with quinoid structure. Electronic energy band structure of carbon nanotubes with quinoid structure is studied by tight-binding approximation. In the presence of bond alternation, calculations show that only armchair (n, n) carbon nanotube (without twisting) remains metallic and zigzag (3ν - 1, -3ν + 1) CNT becomes metallic at the critical elongation. Effect of deformation on the change of band gap is also calculated and discussed.
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Tang, Dai-Ming, Sergey V. Erohin, Dmitry G. Kvashnin, Victor A. Demin, Ovidiu Cretu, Song Jiang, Lili Zhang, et al. "Semiconductor nanochannels in metallic carbon nanotubes by thermomechanical chirality alteration." Science 374, no. 6575 (December 24, 2021): 1616–20. http://dx.doi.org/10.1126/science.abi8884.

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Straining to make a transistor The use of carbon nanotubes (CNTs) as short-channel-length transistors will require control of their chirality, which determines whether they are semiconducting or metallic and if they form strong, low-resistance contacts. Tang et al . fabricated CNT intramolecular transistors by progressive heating and straining of individual CNTs within a transmission electron microscope. Changes to chirality along sections of the nanotube created metallic-to-semiconducting transitions. A semiconducting nanotube channel was covalently bonded to the metallic nanotube source and drain regions. The resulting CNT intramolecular transistors had channel lengths as short as 2.8 nanometers. —PDS
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Lee, Kyu Won, and Cheol Eui Lee. "Half-Metallic Carbon Nanotubes." Advanced Materials 24, no. 15 (March 15, 2012): 2019–23. http://dx.doi.org/10.1002/adma.201200104.

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Khantimerov, S. M., E. F. Kukovitsky, N. A. Sainov, and N. M. Suleimanov. "Fuel Cell Electrodes Based on Carbon Nanotube/Metallic Nanoparticles Hybrids Formed on Porous Stainless Steel Pellets." International Journal of Chemical Engineering 2013 (2013): 1–4. http://dx.doi.org/10.1155/2013/157098.

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The preparation of carbon nanotube/metallic particle hybrids using pressed porous stainless steel pellets as a substrate is described. The catalytic growth of carbon nanotubes was carried out by CVD on a nickel catalyst obtained by impregnation of pellets with a highly dispersive colloidal solution of nickel acetate tetrahydrate in ethanol. Granular polyethylene was used as the carbon source. Metallic particles were deposited by thermal evaporation of Pt and Ag using pellets with grown carbon nanotubes as a base. The use of such composites as fuel cell electrodes is discussed.
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Zhao, Dong Lin, Xia Li, Wei Dong Chi, and Zeng Min Shen. "Formation Mechanism and Microwave Permittivity of Carbon Nanotubes Filled with Metallic Silver Nanowires." Key Engineering Materials 334-335 (March 2007): 685–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.685.

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The filling of multi-walled carbon nanotubes (MWNTs) with metallic silver nanowires via wet chemistry method was investigated. The carbon nanotubes were filled with long continuous silver nanowires. The carbon nanotubes were almost opened and cut after being treated with concentrated nitric acid. Silver nitrate solution filled carbon nanotubes by capillarity. Carbon nanotubes were filled with silver nanowires after calcinations by hydrogen. The diameters of silver nanowires were in the range of 20-40nm, and lengths of 100nm-10μm. We studied the micromorphology of the silver nanowires filled in carbon nanotubes by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on the experimental results, a formation mechanism of the Ag nanowire-filled carbon nanotubes was proposed. And the microwave permittivity of the carbon nanotubes filled with metallic silver nanowires was measured in the frequency range from 2 GHz to 18 GHz. The loss tangent of the carbon nanotubes filled with metallic silver nanowires is high. So the carbon nanotubes filled with metallic silver nanowires would be a good candidate for microwave absorbent.
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Bajwa, Navdeep, Xuesong Li, Pulickel M. Ajayan, and Robert Vajtai. "Mechanisms for Catalytic CVD Growth of Multiwalled Carbon Nanotubes." Journal of Nanoscience and Nanotechnology 8, no. 11 (November 1, 2008): 6054–64. http://dx.doi.org/10.1166/jnn.2008.sw02.

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Carbon nanotubes possess unique properties that make them potentially ideal materials for various technological applications. However, a basic growth mechanism explaining the way metallic atoms interact with carbon to nucleate, grow and heal CNTs still needs to be understood. In this review paper we describe the mechanisms of catalytic chemical vapor deposition growth of multiwalled carbon nanotubes and carbon nanofibers, the role of various parameters that govern their growth kinetics and the knowledge added to singlewalled nanotube growth. We also examine future strategies needed to reveal complete knowledge of the growth mechanisms of carbon nanotubes.
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Singh, Rekha. "Transport Properties of Ordered and Disordered Doped Metallic Nanotubes." International Journal of Research in Engineering, Science and Management 3, no. 11 (November 8, 2020): 40. http://dx.doi.org/10.47607/ijresm.2020.368.

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We have studied the transport properties of ordered and disordered doped metallic nanotubes. We have presented these properties in periodic chemically metallic nitrogen doped metallic nanotubes. Transport properties with long range correlation have been studied using the Green’s function formalism in the frame work of the tight binding approach with effective parameters. Resonant conduction behaviour and ballistic transport have been demonstrated for particular positions of the dopant. These doping patterns have been shown to preserve the Bloach like transport properties and then to avoid Anderson localisation. The conductance response was almost changed because one of the two conductance channels remains true for both armchair and chiral nanotubes. These result reproduce the electronic properties of periodic nitrogen doped graphene. The present result has been drawn for specific chemical substitution of carbon atoms by nitrogen. These remain qualitatively valid for other local modifications of the nanotube by other chemical species by covalent or noncovalent functionalization. The energy of the quasi bound state depend on the specific local modification. We have shown that both axial and screw periodicities gave rise to such a behaviour and that specific disorder preserve their ballistic transport in doped metallic carbon nanotube.
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Gayduchenko, Igor, Georgy Fedorov, Ramil Ibragimov, Tatiana Stepanova, Arsen Gazaliev, Nikolay Vysochanskiy, Yuri Bobrov, Anton Malovichko, Ilya Sosnin, and Ivan Bobrinetskiy. "Synthesis of single-walled carbon nanotube networks using monodisperse metallic nanocatalysts encapsulated in reverse micelles." Chemical Industry 70, no. 1 (2016): 1–8. http://dx.doi.org/10.2298/hemind140910005g.

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We report on a method of synthesis of single-walled carbon nanotubes percolated networks on silicon dioxide substrates using monodisperse Co and Ni catalyst. The catalytic nanoparticles were obtained by modified method of reverse micelles of bis-(2-ethylhexyl) sulfosuccinate sodium in isooctane solution that provides the nanoparticle size control in range of 1 to 5 nm. The metallic nanoparticles of Ni and Co were characterized using transmission electron microscopy (TEM) and atomic-force microscopy (AFM). Carbon nanotubes were synthesized by chemical vapor deposition of CH4/H2 composition at temperature 1000 ?? on catalysts pre-deposited on silicon dioxide substrate. Before temperature treatment during the carbon nanotube synthesis most of the catalyst material agglomerates due to magnetic forces while during the nanotube growth disintegrates into the separate nanoparticles with narrow diameter distribution. The formed nanotube networks were characterized using AFM, scanning electron microscopy (SEM) and Raman spectroscopy. We find that the nanotubes are mainly single-walled carbon nanotubes with high structural perfection up to 200 ?m long with diameters from 1.3 to 1.7 nm consistent with catalyst nanoparticles diameter distribution and independent of its material.
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Дадашян, Л. Х., Р. Р. Трофимов, Н. Н. Конобеева, and М. Б. Белоненко. "Предельно короткие импульсы в оптически анизотропной среде, содержащей углеродные нанотрубки с металлической проводимостью." Оптика и спектроскопия 130, no. 12 (2022): 1861. http://dx.doi.org/10.21883/os.2022.12.54092.49-22.

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In this work, we study the interaction of extremely short pulses with a nonlinear anisotropic optical medium with carbon nanotubes (armchair and zigzag type) with metallic conductivity. The dependence of the pulse shape, width, and intensity on the nanotube chirality indices is analyzed. The most appropriate type of carbon nanotubes is substantiated for providing localized propagation of an electromagnetic field in a medium with anisotropic properties.
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Dissertations / Theses on the topic "METALLIC CARBON NANOTUBES"

1

Farhat, Hootan. "Raman spectroscopy of metallic carbon nanotubes." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59217.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.
Includes bibliographical references (p. 101-108).
Metallic carbon nanotubes are one dimensional conductors that are both technologically promising for electronic applications, and scientifically interesting for studying the physics of low dimensional materials. In this thesis, we present a detailed study of the inelastic light scattering (Raman) spectrum of individual metallic carbon nanotubes, with a focus on the influence of electronic excitations and charged carriers. We have demonstrated that the frequency and linewidth of certain phonon modes of metallic carbon nanotubes depend strongly the Fermi energy, because they couple strongly to low lying electron hole pairs. Next, we report the first experimental observation of electronic Raman scattering in carbon nanotubes. This observation demonstrates that the same electron-hole pairs that participate in damping the optical phonons of metallic carbon nanotubes, may themselves scatter light, thus giving rise to an electronic Raman spectrum. An analysis of the Fermi level and laser energy dependence of the electronic Raman and phonon Raman contributions allows us to explain the asymmetric lineshape of the G-band phonon modes in terms of a Fano interference. In another experiment, we have shown that the charge-induced expansion and contraction of the the graphitic C-C bond length is different for metallic and semiconducting nanotubes. Finally, we have measured the Stokes and antiStokes intensities of the Raman modes in electrically contacted metallic nanotubes in order to determine their phonon populations during high-field electrical transport. The experiments reported here, have helped to clarify the origin of several features in the Raman spectra of metallic carbon nanotubes that have been heavily debated in recent years. These result also shed light on the way electronic excitations and charged carriers affect the physical properties of metallic carbon nanotubes.
by Hootan Farhat.
Ph.D.
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2

Rauf, Hendrik. "Metallic Ground State of Functionalized Carbon Nanotubes." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1184153423397-79783.

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Single-wall carbon nanotubes (SWCNTs) are a fascinating material because they exhibit many outstanding properties. Due to their unique geometric structure, they are a paradigm for one-dimensional systems. Furthermore, depending on their chirality, they can be either metallic or semiconducting. The SWCNT are arranged in bundles of some ten nanotubes with a random distribution of semiconducting and metallic tubes. They are thus one-dimensional objects embedded in a three-dimensional arrangement, the bundles. In this thesis, the metallic ground state of one-dimensional (1D) and three-dimensional (3D) systems is investigated on the basis of SWCNTs, using angle-integrated photoemission spectroscopy. In particular, a transition from a 1D to a 3D metallic system, induced by a charge transfer, is studied on SWCNTs and C60 peapods. In general, the metallic ground state of materials is greatly influenced by correlation effects. In classical three-dimensional metals, electron-electron interaction mainly leads to a renormalization of the charge carrier properties (e.g. effective mass), as described in Landau's Fermi liquid theory. One-dimensional metals are influenced to a greater extent by interactions. In fact, the Landau-quasiparticle picture breaks down due to the Peierls instability. Instead, one-dimensional metals are described by Tomonaga-Luttinger liquid (TLL) theory which predicts unusual properties such as spin-charge separation and non-universal power laws in some physical properties such as the electronic density of states (DOS). Angle-integrated photoemission spectroscopy provides direct access to the DOS and as such directly addresses the power law renormalization of a TLL. It is first shown, that the bundles of single-wall carbon nanotubes indeed exhibit a power law scaling of the electronic density of states is observed as it is expected from TLL theory. The main part of the thesis is devoted to the investigation of the metallic ground state of SWCNTs upon functionalization. In general, functionalization is a controlled modification of the structural and/or electronic properties of SWCNT. It can be carried out e.g. by doping with electron donors or acceptors, by filling the nanospace inside the tubes with molecules or by substituting carbon atoms. First, the behavior of the SWCNT upon chemical doping was probed. The overall modification of the electronic band structure can be explained well by a rigid band shift model. The one-dimensional character of the metallic tubes in the bundle is retained at low doping, but when the semiconducting tubes in the sample are also rendered metallic by the charge transfer, a Fermi edge emerges out of the power law renormalization of the spectral weight, signifying a transition to a three-dimensional metallic behavior. This can be explained by an increased interaction between the tubes in the bundle. A crossover from a Tomonaga-Luttinger liquid to a Fermi liquid is observed. The filling of SWCNTs with C60 molecules leads to the formation of so-called peapods. It raises questions concerning the role of the additional bands originating from the C60 filling in the one-dimensional system. In the pristine state, the states of the C60 filling were found to have no influence on the metallic ground state. The TLL power law scaling of the density of states is observed. The overall interaction between the SWCNT host and the C60 filling is small. Upon doping however, the modified band structure leads to a qualitative change in the crossover from a TLL to a Fermi liquid. Upon doping, also states in the conduction band of the C60 are filled. The evolution of the power law scaling at intermediate doping can be interpreted as an opening of an additional conduction channel of one-dimensional metallic chains of C60 inside the tubes. This is in good agreement with transport experiments. Upon further doping, a Fermi edge similar to the highly doped SWCNTs is observed.
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Rauf, Hendrik. "Metallic Ground State of Functionalized Carbon Nanotubes." Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A24959.

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Single-wall carbon nanotubes (SWCNTs) are a fascinating material because they exhibit many outstanding properties. Due to their unique geometric structure, they are a paradigm for one-dimensional systems. Furthermore, depending on their chirality, they can be either metallic or semiconducting. The SWCNT are arranged in bundles of some ten nanotubes with a random distribution of semiconducting and metallic tubes. They are thus one-dimensional objects embedded in a three-dimensional arrangement, the bundles. In this thesis, the metallic ground state of one-dimensional (1D) and three-dimensional (3D) systems is investigated on the basis of SWCNTs, using angle-integrated photoemission spectroscopy. In particular, a transition from a 1D to a 3D metallic system, induced by a charge transfer, is studied on SWCNTs and C60 peapods. In general, the metallic ground state of materials is greatly influenced by correlation effects. In classical three-dimensional metals, electron-electron interaction mainly leads to a renormalization of the charge carrier properties (e.g. effective mass), as described in Landau's Fermi liquid theory. One-dimensional metals are influenced to a greater extent by interactions. In fact, the Landau-quasiparticle picture breaks down due to the Peierls instability. Instead, one-dimensional metals are described by Tomonaga-Luttinger liquid (TLL) theory which predicts unusual properties such as spin-charge separation and non-universal power laws in some physical properties such as the electronic density of states (DOS). Angle-integrated photoemission spectroscopy provides direct access to the DOS and as such directly addresses the power law renormalization of a TLL. It is first shown, that the bundles of single-wall carbon nanotubes indeed exhibit a power law scaling of the electronic density of states is observed as it is expected from TLL theory. The main part of the thesis is devoted to the investigation of the metallic ground state of SWCNTs upon functionalization. In general, functionalization is a controlled modification of the structural and/or electronic properties of SWCNT. It can be carried out e.g. by doping with electron donors or acceptors, by filling the nanospace inside the tubes with molecules or by substituting carbon atoms. First, the behavior of the SWCNT upon chemical doping was probed. The overall modification of the electronic band structure can be explained well by a rigid band shift model. The one-dimensional character of the metallic tubes in the bundle is retained at low doping, but when the semiconducting tubes in the sample are also rendered metallic by the charge transfer, a Fermi edge emerges out of the power law renormalization of the spectral weight, signifying a transition to a three-dimensional metallic behavior. This can be explained by an increased interaction between the tubes in the bundle. A crossover from a Tomonaga-Luttinger liquid to a Fermi liquid is observed. The filling of SWCNTs with C60 molecules leads to the formation of so-called peapods. It raises questions concerning the role of the additional bands originating from the C60 filling in the one-dimensional system. In the pristine state, the states of the C60 filling were found to have no influence on the metallic ground state. The TLL power law scaling of the density of states is observed. The overall interaction between the SWCNT host and the C60 filling is small. Upon doping however, the modified band structure leads to a qualitative change in the crossover from a TLL to a Fermi liquid. Upon doping, also states in the conduction band of the C60 are filled. The evolution of the power law scaling at intermediate doping can be interpreted as an opening of an additional conduction channel of one-dimensional metallic chains of C60 inside the tubes. This is in good agreement with transport experiments. Upon further doping, a Fermi edge similar to the highly doped SWCNTs is observed.
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4

Height, Murray John 1975. "Flame synthesis of carbon nanotubes and metallic nanomaterials." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/49807.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2003.
Includes bibliographical references.
Carbon nanotubes are a remarkable material with many appealing properties. Despite the appeal of this material, there are few synthesis techniques capable of producing nanotubes in large quantities at low-cost. The broad objective of this study was to examine the potential of a premixed flame for the synthesis of carbon nanotubes with the view that flame synthesis may prove a means of continuous production at low-cost. The specific approach focused on the formation of metallic nanoparticles in flames; identification of nanotube formation zones, time scales, and transition conditions; characterization of material properties; and the development of a formation mechanism and associated flame-model. Carbon nanotube formation requires a source of carbon, a source of heat and the presence of metal particles. A fuel-rich flame is a high-temperature, carbon-rich environment and addition of metal is likely to give conditions suitable for nanotube growth. This study considered a premixed acetylene/oxygen/15 mol% argon flame doped with iron pentacarbonyl (Fe(CO)₅) vapor (typically 6100 ppm), operated at 50 Torr pressure and 30 cm/s cold gas feed velocity. The flame was investigated with regard to the growth of metal particles and subsequent formation and growth of carbon nanotubes. Thermophoretic samples were extracted from the flame at various heights above burner (HAB) and analyzed using transmission electron microscopy (TEM). HAB is representative of residence time in the flame. Size distribution and number density data were extracted from TEM images using a quantitative image analysis technique. The mean particle size for a precursor concentration of 6100 ppm was observed to increase from around 2 to 4 nm between 20 and 75 mm HAB.
(cont.) The particle number density results showed a decreasing number density with increasing HAB, giving a complementary picture of the particle dynamics in the flame. Single-walled carbon nanotubes (SWNT) were also observed to form in the premixed flame. Thermophoretic sampling and TEM analysis gave insight into nanotube formation dynamics. Nanotube structures were observed to form as early as 30 mm HAB (20 ms) with growth proceeding rapidly within the next 10 to 20 mm HAB. The growth-rate for the nanotubes in this interval is estimated to be between 10 and 100 ptm per second. The upper region of the flame (50 to 70 mm HAB; 35 to 53 ms) is dominated by tangled web structures formed via the coalescence of individual nanotubes formed earlier in the flame. The nanotube structures are exclusively single-walled with no multi-walled nanotubes observed in any of the flame samples. The effect of carbon availability on nanotube formation was tested by collecting samples over a range of fuel equivalence ratios at fixed HAB. The morphology of the collected material revealed a nanotube formation 'window' of 1.5 < < 1.9, with lower dominated by discrete particles and higher favoring soot-like structures. These results were also verified using Raman spectroscopy. A clear trend of improved nanotube quality (number and length of nanotubes) is observed at lower . More filaments were observed with increasing concentration, however the length (and quality) of the nanotubes appeared higher at lower concentrations ...
by Murray John Height.
Ph.D.
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Zienert, Andreas. "Electronic Transport in Metallic Carbon Nanotubes with Metal Contacts." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-108205.

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The continuous migration to smaller feature sizes puts high demands on materials and technologies for future ultra-large-scale integrated circuits. Particularly, the copper-based interconnect system will reach fundamental limits soon. Their outstanding properties make metallic carbon nanotubes (CNTs) an ideal material to partially replace copper in future interconnect architectures. Here, a low contact resistance to existing metal lines is crucial. The present thesis contributes to the theory and numerical description of electronic transport in metallic CNTs with metal contacts. Different theoretical approaches are applied to various contact models and electrode materials (Al, Cu, Pd, Ag, Pt, Au) are compared. Ballistic transport calculations are based on the non-equilibrium Greens function formalism combined with tight-binding (TB), extended Hückel theory (EHT) and density functional theory (DFT). Simplified contact models allow a qualitative investigation of both the influence of geometry and CNT length, and the strength and extent of the contact on the transport properties. In addition, such simple contact models are used to compare the influence of different electronic structure methods on transport. It is found that the semiempirical TB and EHT are inadequate to quantitatively reproduce the DFT-based results. Based on this observation, an improved set of Hückel parameters is developed, which remedies this insufficiency. A systematic investigation of different contact materials is carried out using well defined atomistic metal-CNT-metal structures, optimized in a systematic way. Analytical models for the CNT-metal interaction are proposed. Based on that, electronic transport calculations are carried out, which can be extended to large systems by applying the computationally cheap improved EHT. The metal-CNT-metal systems can then be ranked by average conductance: Ag ≤ Au < Cu < Pt ≤ Pd < Al. This corresponds qualitatively with calculated contact distances, binding energies and work functions of CNTs and metals. To gain a deeper understanding of the transport properties, the electronic structure of the metal-CNT-metal systems and their respective parts is analyzed in detail. Here, the energy resolved local density of states is a valuable tool to investigate the CNT-metal interaction and its influences on the transport
Die kontinuierliche Verkleinerung der Strukturgrößen stellt hohe Anforderungen an Materialen und Technologien zukünftiger hochintegrierter Schaltkreise. Insbesondere die Leistungsfähigkeit kupferbasierte Leitbahnsystem wird bald an fundamentale Grenzen stoßen. Aufgrund ihrer hervorragenden Eigenschaften könnten metallische Kohlenstoffnanoröhren (engl. Carbon Nanotubes, CNTs) Kupfer in zukünftigen Leitbahnsystemen teilweise ersetzen. Dabei ist ein geringer Kontaktwiderstand mit vorhandenen Leitbahnen von entscheidender Bedeutung. Die vorliegende Arbeit liefert grundlegende Beiträge zur Theorie und zur numerischen Beschreibung elektronischer Transporteigenschaften metallischer CNTs mit Metallkontakten. Dazu werden verschiedene theoretische Ansätze auf diverse Kontaktmodelle angewandt und eine Auswahl von Elektrodenmaterialen (Al, Cu, Pd, Ag, Pt, Au) verglichen. Die Beschreibung ballistischen Elektronentransports erfolgt mittels des Formalismus der Nichtgleichgewichts-Green-Funktionen in Kombination mit Tight-Binding (TB), erweiterter Hückel-Theorie (EHT) und Dichtefunktionaltheorie (DFT). Vereinfachte Kontaktmodelle dienen der qualitativen Untersuchung des Einflusses von Geometrie und Länge der Nanoröhren, sowie von Stärke und Ausdehnung des Kontaktes. Darüber hinaus erlauben solch einfache Modelle mit geringem numerischen Aufwand den Einfluss verschiedener Elektronenstrukturmethoden zu untersuchen. Es zeigt sich, dass die semiempirischen Methoden TB und EHT nicht in der Lage sind die Ergebnisse der DFT quantitativ zu reproduzieren. Ausgehend von diesen Ergebnissen wird ein verbesserter Satz von Hückel-Parametern generiert, der diesen Mangel behebt. Die Untersuchung verschiedener Kontaktmaterialien erfolgt an wohldefinierten atomistischen Metall-CNT-Metall-Strukturen, welche systematisch optimiert werden. Analytische Modelle zur Beschreibung der CNT-Metall-Wechselwirkung werden vorgeschlagen. Darauf aufbauende Berechnungen der elektronischen Transporteigenschaften, können mit Hilfe der verbesserten EHT auf große Systeme ausgedehnt werden. Die Ergebnisse ermöglichen eine Reihung der Metall-CNT-Metall-Systeme hinsichtlich ihrer Leitfähigkeit: Ag ≤ Au < Cu < Pt ≤ Pd < Al. Dies korrespondiert qualitativ mit berechneten Kontaktabständen, Bindungsenergien und Austrittarbeiten der CNTs und Metalle. Zum tieferen Verständnis der Transporteigenschaften erfolgt eine detaillierte Analyse der elektronischen Struktur der Metall-CNT-Metall-Systeme und ihrer Teilsysteme. Dabei erweist sich die energieaufgelöste lokale Zustandsdichte als nützliches Werkzeug zur Visulisierung und zur Charakterisierung der Wechselwirkung zwischen CNT und Metall sowie deren Einfluss auf den Transport
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Lewis, Peter. "Investigations into hybrids of carbon nanotubes and organo-metallic molecular systems." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.642027.

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Endohedral functionalization via supercritical CO2 was undertaken in order to produce encapsulation of organometallic systems that are difficult to encapsulate otherwise due to either their large size or extreme air sensitivity. Organometallic molecular systems from the prophyrin and phthalocyanine families (such as NiPc, ClAlPc and NiTPP) were successfully encapsulated inside of nanotubes with relatively large diameters (centred around 2 nm). This was assessed by a combination of high resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. HRTEM revealed previously unreported ordering of NiTPP, a large planar molecule, in row-like assemblies inside nanotubes of diameters that match best the geometrical size of the molecule (2 nm), highlighting the role of confinement in promoting assembly. Using both endohedral and exohedral functionalization with NiTPP, ClAlPc and NiPc molecules provided a set of systems differing by only one specific parameter (e.g. central ion or body type, or size of the HOMO-LUMO gap), or comparatively affected the ability to bind to the nanotubes - the associated changes in the electronic properties of the nanotubes were revealed by resonant Raman spectroscopy. These changes were interpreted in terms of ability of the guest molecular species to produce charge transfer to/from the nanotube, and/or induce structural strain.
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Nasuhoglu, Deniz. "Synthesis of carbon nanotubes on metallic grids for applications in electrochemical capacitors." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112580.

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Recently, there has been a growing demand for electrode materials to serve as electrochemical capacitors (EC). It has been an important issue to come up with environment friendly electric power sources to reduce pollution caused by combustion engines of automotive systems. Even though conventional battery systems and fuel cells supply high energy, they lack the high specific power that would be required for hybrid power sources. The ECs can fill the gap between conventional capacitors and batteries.
Carbon nanotubes (CNTs), discovered by Iijima in 1991, attracted great attention in recent years for their unique properties, such as mesoporous character, excellent conductivity, moderate to high specific surface area as well as chemical and mechanical stability. These properties of CNTs make them useful in a wide of range applications including electrode materials for EC applications.
The preparation of CNT electrodes is accomplished by either pasting them onto metallic current collectors with the use of binder materials such as PVDF or growing them from deposited metal nanoparticles on substrates such as graphite paper. The deposition of metal nanoparticles is achieved via sputtering techniques or lengthy electrochemical deposition methods. The aim of this research was to simplify the preparation step by growing CNTs directly on metallic substrates and to study the relationship between surface area and electrochemical capacitance of CNTs. CNTs were produced on metal-alloy grids via chemical vapor deposition (CVD) of acetylene (C2H2). The physical characterization of the samples was achieved by Field Emission Scanning Electron Microscopy (FE-SEM), Raman spectroscopy and Single point BET surface area. The electrochemical performance of the samples was evaluated by cyclic voltammetry (CV) in a three electrode electrochemical cell with 1M sulfuric acid (H2SO4) solution as the electrolyte.
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8

Villalpando, Páez Federico. "Raman spectroscopy of double walled carbon nanotubes with different metallic and semiconducting configurations." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59238.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.
Includes bibliographical references (p. 117-125).
A double-walled carbon nanotube (DWNT) provides the simplest system to study the interaction between concentric tubes in carbon nanotubes. The inner and outer walls of a DWNT can be metallic (M) or semiconducting (S), and each of the four possible configurations (MUM, M©S, SUS, S©M) has different electronic properties. We analyze the Raman spectra from undoped and boron-doped chemical vapor deposition-derived DWNT bundles (CVD-DWNTs) that exhibit the "coalescence inducing mode" (CIM) as they are heat treated at temperatures between 12000C and 2000'C. We then report, for the first time, detailed Raman spectroscopy experiments carried out on individual DWNTs, where both concentric tubes of the same DWNT are measured under resonance conditions. A technique is developed that combines tunable Raman spectroscopy with Raman mapping procedures and electron beam lithography to enable the acquisition of Raman spectra from the individual constituents of the same isolated DWNT. By using the technique mentioned above, we measure resonant Raman scattering from 11 individual C60-derived double wall carbon nanotubes all having inner semiconducting (6,5) tubes and various outer metallic tubes. We report that in an individual DWNT an increase in the RBM frequency of the inner tube is related to an increase in the RBM frequency of the outer tube due to a decrease in the wall to wall distance. Finally, we use 40 laser excitation energies to analyze the differences in the Raman spectra from chemical vapor deposition-derived DWNT bundles (CVD-DWNTs), fullerene-derived DWNT bundles (C₆₀-DWNTs) and individual fullerene-derived DWNTs with inner type I and type II semiconducting tubes paired with outer metallic tubes.
by Federico Villalpando Páez.
Ph.D.
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Conturbia, Giovanni de Lima Cabral. "Celulas solares baseadas em nanotubos de carbono modificado e nanoparticulas de ouro." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250676.

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Orientador: Ana Flavia Nogueira
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-14T13:13:51Z (GMT). No. of bitstreams: 1 Conturbia_GiovannideLimaCabral_M.pdf: 7472586 bytes, checksum: 9ede857037431127443d2bed95bd1ccc (MD5) Previous issue date: 2009
Resumo:Células solares orgânicas têm despertado atenções devido ao baixo custo de produção e dos materiais utilizados, bem como devido à versatilidade química e de propriedades eletrônicas e ópticas dos semicondutores orgânicos. A eficiência atual atinge 5% (100 mWcm). Nanotubos de carbono encontram suas aplicações nessas células ora como eletrodos transparentes ora como material receptor de elétrons. Nesse trabalho, foi realizada a modificação química de nanotubos de carbono de única camada com grupos tióis, visando a incorporação de nanopartículas metálicas ou semicondutoras. O material de partida, bem como os nanotubos modificados, foi caracterizado por Espectroscopia Raman, Espectroscopia de Fotoelétron por Raios-X, Análise Térmica e Microscopia Eletrônica de Transmissão de Alta Resolução. Foi necessário um pós-tratamento (térmico e lavagens com diversos solventes) para que pudéssemos obter nanotubos individuais e funcionalizados. O pós-tratamento também possibilitou um aumento na fotocorrente dos dispositivos em comparação com o dispositivo sem nanotubos de carbono. A incorporação de nanopartículas de ouro no sistema P3HT/fulereno acresceu a fotocorrente e o fator de preenchimento dos dispositivos. Estudos de caracterização através de difração de raios-X, espectroscopia UV-visível e microscopia de força atômica, indicam que esse aumento está relacionado a uma mudança na morfologia do sistema, aumentando a cristalinidade do polímero e também ao efeito plasmônico com a adição das nanopartículas. Imagens de microscopia eletrônica de transmissão revelaram que as nanopartículas de ouro estão distribuídas tanto na fase polimérica quanto na fase contendo moléculas de fulereno
Abstract: Organic solar cells have attracted attention due to their low costs of production and materials used, as well as the chemical versatility and good electronic and optical properties of organic semiconductors. The current efficiency reaches 5% (100 mWcm). Carbon nanotubes materials can be applied in these cells as both transparent electrode or as electron acceptor materials. In this work, the chemical modification of single wall carbon nanotubes was carried out attaching thiol groups, aiming the incorporation of semiconductor or metallic nanoparticles. The raw material and the modified nanotubes were characterized by Raman Spectroscopy, X-ray Photoelectron Spectroscopy, Thermal Analysis and High Resolution Transmission Electron Microscopy. A post-treatment (thermal and washing with different solvents) was necessary in order to obtain single functionalized nanotubes. The post-treatment also allowed an increase in the photocurrent of the devices compared to the device without carbon nanotubes. The incorporation of gold nanoparticles in the P3HT/fullerene system increased the photocurrent and the fill factor of the devices. X-Ray diffraction, UV-vis Spectroscopy and Atomic Force Microscopy studies reveal that such increase can be related to the plasmonic effect and also to a change in the morphology, increasing polymer crystallinity after incorporation of the gold nanoparticles. High resolution transmission microscopy images showed that the nanoparticles are distributed between both polymer and fullerene phase.
Mestrado
Físico-Química
Mestre em Química
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Luo, Weiqi. "Atomistic Materials Modeling of Complex Systems: Carbynes, Carbon Nanotube Devices and Bulk Metallic Glasses." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1218567734.

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Books on the topic "METALLIC CARBON NANOTUBES"

1

Rao, Bakshi Srinivasa, and Lahiri Debrupa, eds. Carbon nanotubes: Reinforced metal matrix composites. Boca Raton: CRC Press, 2011.

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Agarwal, Arvind, Srinivasa Rao Bakshi, Debrupa Lahiri, Andy Nieto, and Ankita Bisht. Carbon Nanotubes. Taylor & Francis Group, 2021.

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Agarwal, Arvind, Srinivasa Rao Bakshi, and Debrupa Lahiri. Carbon Nanotubes. Taylor & Francis Group, 2010.

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Kamarás, Katalin, and Àron Pekker. Identification and separation of metallic and semiconducting carbon nanotubes. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533053.013.4.

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This article describes the identification and separation of metallic and semiconducting carbon nanotubes according to their electric properties. It first provides an overview of the electronic structure of nanotubes, focusing on how their metallic and semiconducting properties arise. It then considers the most widely used characterization techniques used in determining metallic or semiconducting behavior, including Raman spectroscopy and photoluminescence measurements. It also discusses specific chirality-selective growth techniques, physical postgrowth selection methods, enrichment by chirality-sensitive chemical reactions, and modification of transport properties without change in chirality. The article concludes with a review of some applications of metallic and semiconducting carbon nanotubes as transparent conductive coatings.
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Zhang, Lianchi. Carbon Nanotubes and Their Composites: Properties, Mechanics and Engineering Applications. Elsevier Science & Technology Books, 2019.

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Agarwal, Arvind, Srinivasa Rao Bakshi, Debrupa Lahiri, Andy Nieto, and Ankita Bisht. Carbon Nanotubes: Reinforced Metal Matrix Composites. Taylor & Francis Group, 2021.

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Carbon Nanotubes: Reinforced Metal Matrix Composites. Taylor & Francis Group, 2021.

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Agarwal, Arvind, Srinivasa Rao Bakshi, and Debrupa Lahiri. Carbon Nanotubes: Reinforced Metal Matrix Composites. Taylor & Francis Group, 2018.

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Agarwal, Arvind, Srinivasa Rao Bakshi, and Debrupa Lahiri. Carbon Nanotubes: Reinforced Metal Matrix Composites. Taylor & Francis Group, 2018.

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Agarwal, Arvind, Srinivasa Rao Bakshi, and Debrupa Lahiri. Carbon Nanotubes: Reinforced Metal Matrix Composites. Taylor & Francis Group, 2018.

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Book chapters on the topic "METALLIC CARBON NANOTUBES"

1

Smalley, R. E. "Crystalline Ropes of Metallic Carbon Nanotubes." In Supercarbon, 31–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03569-6_3.

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Egger, R., A. Bachtold, M. S. Fuhrer, M. Bockrath, D. H. Cobden, and P. L. McEuen. "Luttinger Liquid Behavior in Metallic Carbon Nanotubes." In Lecture Notes in Physics, 125–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45532-9_7.

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Thomas, B. J. C., M. S. P. Shaffer, Sarah Freeman, M. Koopman, Krish K. Chawla, and Aldo R. Boccaccini. "Electrophoretic Deposition of Carbon Nanotubes on Metallic Surfaces." In Electrophoretic Deposition: Fundamentals and Applications II, 141–46. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-998-9.141.

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Kuroda, Marcelo A., and Jean-Pierre Leburton. "High-Field Electrothermal Transport in Metallic Carbon Nanotubes." In Physical Models for Quantum Wires, Nanotubes, and Nanoribbons, 353–78. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003219378-29.

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Anderson, Ankoma, Fushen Lu*, Mohammed J. Meziani*, and Ya-Ping Sun*. "Chapter 6. Metallic Single-walled Carbon Nanotubes for Electrically Conductive Materials and Devices." In Carbon Nanotube-Polymer Composites, 182–211. Cambridge: Royal Society of Chemistry, 2013. http://dx.doi.org/10.1039/9781849736817-00182.

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Zeng, Hui, Jean-Pierre Leburton, Huifang Hu, and Jianwei Wei. "Vacancy Cluster–Limited Electronic Transport in Metallic Carbon Nanotubes." In Physical Models for Quantum Wires, Nanotubes, and Nanoribbons, 407–16. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003219378-32.

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Kuroda, Marcelo A., Andreas Cangellaris, and Jean-Pierre Leburton. "Nonlinear Transport and Heat Dissipation in Metallic Carbon Nanotubes." In Physical Models for Quantum Wires, Nanotubes, and Nanoribbons, 319–29. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003219378-26.

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Harigaya, Kikuo. "Impurity scattering in metallic carbon nanotubes with superconducting pairs." In Springer Proceedings in Physics, 156–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59484-7_67.

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Edtmaier, C., T. Janhsen, R. C. Hula, Laurent Pambaguian, Hans Georg Wulz, Stefan Forero, and F. Hepp. "Carbon Nanotubes as Highly Conductive Nano-Fillers in Metallic Matrices." In Advanced Materials Research, 131–37. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-01-8.131.

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Kuroda, Marcelo A., and Jean-Pierre Leburton. "Joule Heating Induced Negative Differential Resistance in Freestanding Metallic Carbon Nanotubes." In Physical Models for Quantum Wires, Nanotubes, and Nanoribbons, 331–39. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003219378-27.

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Conference papers on the topic "METALLIC CARBON NANOTUBES"

1

Pozdnyakov, D. V. "Magnetoresistance of metallic single-wall carbon nanotubes." In 2010 20th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo 2010). IEEE, 2010. http://dx.doi.org/10.1109/crmico.2010.5632953.

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Yonezawa, Norifumi, and Hidekatsu Suzuura. "Strain-induced localization in metallic carbon nanotubes." In PHYSICS OF SEMICONDUCTORS: 28th International Conference on the Physics of Semiconductors - ICPS 2006. AIP, 2007. http://dx.doi.org/10.1063/1.2730251.

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Al Ahmad, Mahmoud, Abbes Tahraoui, W. I. Milne, and Robert Plana. "Metallic multiwalled carbon nanotubes for microwave applications." In 2007 International Semiconductor Device Research Symposium. IEEE, 2007. http://dx.doi.org/10.1109/isdrs.2007.4422424.

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Lee, Hyung Woo, Soo Hyun Kim, Yoon Keun Kwak, and Chang Soo Han. "A New Method for a Single Semi-Conducting Nanotube Device." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61602.

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We report a new technology for the selective deposition of a semi-conducting single-walled carbon nanotube(SWNT) between two electrodes. This technology consists of two processes. First, to separate the most of metallic nanotubes from semi-conducting ones and align the nanotubes, we applied dc and ac voltage to the electrodes respectively. But, in spite of the separation of the metallic nanotubes from semi-conducting nanotubes, some of metallic nanotubes and semi-conducting nanotubes are still deposited together. The second process is to burn the metallic and semi-conducting nanotubes by applying the voltage between two electrodes which enable to obtain a single semi-conducting nanotube structure. We verified the trace of the burning by SEM images or AFM images, and checked the characteristic of semi-conducting nanotubes through the I-V characteristic graph.
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Guo, Kun, and Ahalapitiya H. Jayatissa. "Growth of Carbon Nanotubes on Metallic Catalyst by CVD." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15356.

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The growth of carbon nanotubes was investigated using a filament assisted atmospheric CVD system. The scope of this study is two fold: (i) control the growth of carbon nanotubes by chemical treatment of catalysis surface and temperatures and (ii) study of nanotubes growth for gas sensor applications. We have conducted the growth of carbon nanotubes on surfaces by treatment of metal catalyst surface with different acids and plasma. The treated surfaces were kept in a furnace tube CVD and the nanotubes were grown using a hot filament assisted decomposition of methane (CH4) and argon (Ar) gas mixture. It was found that the growth of carbon nanotubes could be controlled by the catalysts, filament and furnaces temperature.
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Huang, Xue Ming Henry, Robert Caldwell, Bhupesh Chandra, Seong Chan Jun, Mingyuan Huang, and James Hone. "Controlled Manipulation of Carbon Nanotubes for Nanodevices, Arrays, and Films." In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87033.

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Carbon nanotubes hold great promise for a number of applications due to their outstanding electrical, thermal, and mechanical properties. However, nanomanufacturing issues constitute a major area of challenge for successful implementation of nanotubes. In particular, because subtle changes in physical structure (chirality) can cause the electronic structure to vary from metallic to semiconducting, the goal of fully controlled nanotube device fabrication has proven elusive. In addition, materials compatibility issues impose significant limitations toward integration of nanotubes with many substrates and systems. We have developed techniques for nanotube device manufacture that rely upon mechanical transfer of chemical vapor deposition (CVD)-grown nanotubes from one substrate to another. These techniques can be used on the level of individual nanotubes, for controlled fabrication of arrays, or for manufacture of thin films.
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Mahjouri-Samani, M., Y. S. Zhou, W. Xiong, Y. Gao, M. Mitchell, and Y. F. Lu. "Laser-assisted selective removal of metallic carbon nanotubes." In ICALEO® 2009: 28th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2009. http://dx.doi.org/10.2351/1.5061502.

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Yang Wu, Janina Maultzsch, Ernst Knoesel, Bhupesh Chandra, Mingyuan Huang, Matthew Y. Sfeir, Louis E. Brus, James Hone, and Tony F. Heinz. "Raman scattering from individual, isolated metallic carbon nanotubes." In 2007 Quantum Electronics and Laser Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/qels.2007.4431776.

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Walker, Don, Colin J. Mann, John C. Nocerino, and Simon H. Liu. "Proton irradiation of metallic single-walled carbon nanotubes." In 2011 37th IEEE Photovoltaic Specialists Conference (PVSC). IEEE, 2011. http://dx.doi.org/10.1109/pvsc.2011.6186268.

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Doome, R. J., A. Fonseca, and J. B. Nagy. "New metallic alloys incorporating fullerenes and carbon nanotubes." In The 12th international winterschool on electronic properties of novel materials: progress in molecular nanostructures. AIP, 1998. http://dx.doi.org/10.1063/1.56440.

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Reports on the topic "METALLIC CARBON NANOTUBES"

1

Brus, Louis E. Metallic Carbon Nanotubes and Ag Nanocrystals. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1121887.

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Sun, Ya-Ping. Quantitative Separation of Single-Walled Carbon Nanotubes into Metallic and Semiconducting Fractions. Fort Belvoir, VA: Defense Technical Information Center, August 2012. http://dx.doi.org/10.21236/ada581369.

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