electronic and structural properties of carbon nanotubes

... DRESSELHAUS and R SAITO: Physics of carbon nanotubes 27 J W MINTMIRE and C T WHITE: Electronic and structural properties of carbon nanotubes 37 C.-H KIANG, W A GODDARD 1 R BEYERS and D S ... physical properties of the nanotubes The symmetry groups for carbon nanotubes can be either symmorphic [such as armchair (n,n )and zigzag Physics of carbon nanotubes 29 Table Parameters of carbon nanotubes ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding properties of double-wall nanotubes and arrays of nanotubes are...

Ngày tải lên: 05/03/2014, 15:21

... DRESSELHAUS and R SAITO: Physics of carbon nanotubes 27 J W MINTMIRE and C T WHITE: Electronic and structural properties of carbon nanotubes 37 C.-H KIANG, W A GODDARD 1 R BEYERS and D S ... physical properties of the nanotubes The symmetry groups for carbon nanotubes can be either symmorphic [such as armchair (n,n )and zigzag Physics of carbon nanotubes 29 Table Parameters of carbon nanotubes ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding properties of double-wall nanotubes and arrays of nanotubes are...

Ngày tải lên: 27/06/2014, 17:20

... DRESSELHAUS and R SAITO: Physics of carbon nanotubes 27 J W MINTMIRE and C T WHITE: Electronic and structural properties of carbon nanotubes 37 C.-H KIANG, W A GODDARD 1 R BEYERS and D S ... physical properties of the nanotubes The symmetry groups for carbon nanotubes can be either symmorphic [such as armchair (n,n )and zigzag Physics of carbon nanotubes 29 Table Parameters of carbon nanotubes ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding properties of double-wall nanotubes and arrays of nanotubes are...

Ngày tải lên: 27/06/2014, 17:20

... sensor response, and times of adsorption/desorption of screenprinted and dip-coated films sensing a flux of 150 mL of N2 with a charge of 1% NH3 Material Fig Optical properties of: (a) dip-coated ... adsorption/desorption, and the direction and amount of charge transfer Fig Photocurrent ratio of dip-coated TiO2 –MWCNT films and TiO2 films as a function of wavelenght The spectral response of TiO2 (broken line) and ... electrochemical and photoelectrochemical energy conversion and storage, synthesis and characterization of composites based in inorganic and organic semiconductors, and nanocarbon materials in energy and...

Ngày tải lên: 20/03/2014, 13:07

... to 60 nm (c, d) Raman shift of the G and 2D bands, respectively The positions of both bands are shifted to higher energies The G band is around 1610 cm-1 and the 2D band around 2750 cm-1 This high ... centered at 1582 cm-1, and a 2D band at 2690 cm-1 The average up shift is then of 28 cm-1 for the G band, and of 60 (30) cm-1 for the 2D (D) band, respectively The G and 2D band Raman shift maps are ... D band lies around 1380 cm-1, the G band around 1610 cm-1, and the 2D band around 2750 cm-1 whereas neutral relaxed graphene has a D band around 1350 cm-1, a G band centered at 1582 cm-1, and...

Ngày tải lên: 21/06/2014, 05:20

... performance of zigzag and chiral carbon nanotubes Xiaojian Tan1, Huijun Liu*1, Yanwei Wen1, Hongyan Lv1, Lu Pan1, Jing Shi*1, and Xinfeng Tang2 Key Laboratory of Artificial Micro- and Nano-structures of ... simulations and nonequilibrium Green's function method, we investigate the thermoelectric properties of a series of zigzag and chiral carbon nanotubes which exhibit interesting diameter and chirality ... dynamics of singlewalled carbon nanotubes Phys Rev B 2003, 67:045413 33 Esfarjani K, Zebarjadi M, Kawazoe Y: Thermoelectric properties of a nanocontact made of two-capped single-wall carbon nanotubes...

Ngày tải lên: 21/06/2014, 17:20

... properties of carbon nanotubes 1.1.3 Applications of carbon nanotubes 1.2 Motivation 1.3 Objective and scope of work 11 1.4 Layout of the thesis 13 CHAPTER 2: LITERATURE REVIEW 2.1 Buckling of ... achiral carbon nanotubes The latter comprises of both zigzag and armchair carbon nanotubes This categorization is done based on the orientation of carbon- carbon (C-C) bonds Orientation of C-C ... bonds where each carbon atom is bonded to other carbon atoms 1.1.2 Mechanical properties of carbon nanotubes Carbon nanotube is known to possess superior mechanical properties These properties have...

Ngày tải lên: 09/09/2015, 18:54

... LIST OF SYMBOLS XV XVII CHAPTER INTRODUCTION 1.1 Background 1.2 Carbon Nanotubes 1.2.1 Discovery of Carbon Nanotubes 1.2.2 Bonding Structures of Carbon Nanotubes 1.2.3 Properties of Carbon Nanotubes ... outer shell of the CNTs, whatever type of electronic properties may be [32, 33] Field Emission Properties of Carbon Nanotubes It is known that a CNT is a very thin filament-like carbon molecule ... 29 S Saito and A Zettl, Carbon Nanotubes: Quantum Cylinders of Graphene (Elsevier, UK, 2008) 30 S Reich, C Thomsen, and J Maultzsch, Carbon Nanotubes: Basic Concepts and Physical Properties (Wiley-VCH,...

Ngày tải lên: 11/09/2015, 10:17

... emission mass, barrier height of the emitter F is the local field, ε0 is the permittivity of free space, emitters, 21 Chapter Physics of Field Emission and t(y) and υ(y) are the Nordheim elliptic ... electron emission mechanism The slope of the linear region of the F-N plot is a function of both β and Ø, which can be expressed as below by transformation of the Eq (2.3): φ3/ Slope = −6.83 × ... low and high electrical field This deviation might be due to the space charge effects, overheating of the emitter tips or the low concentration of the carriers in the tips, conduction band of...

Ngày tải lên: 11/09/2015, 10:17

... various materials, including carbon and carbon related materials (diamond, nanocrystalline diamond and CNTs, etc.) and non -carbon advanced materials, such as GaN, SiC, Ga2O3 and silicon whiskers [18] ... representing the order of diffraction, λ is the wavelength, d is the interplanar spacing of the reflecting (diffracting) plane, and θ is the angle of the incidence and of the diffraction of the radiation ... measurements of the work functions and band structures of the solid, the surface and adsorbed layers [27, 28] In this study, UPS technique was used to measure the work functions of the samples Photons of...

Ngày tải lên: 11/09/2015, 10:17

... covered with amorphous carbon, which is the product of the thermal deposition of hydrocarbon [3] 52    Chapter Synthesis of Vertically-Aligned Carbon Nanotubes In terms of other CNT growth approaches, ... Schematic setup of the PECVD system used 55    Chapter Synthesis of Vertically-Aligned Carbon Nanotubes 4.3 Results and Discussion 4.3.1 Characterization of the As-Grown Carbon Nanotubes Fig 4.2 ... Synthesis of Vertically-Aligned Carbon Nanotubes 18 S Hofmann, B Kleinsorge, C Ducati, A C Ferrari, and J Roberson, Diamond Relat Mater 13, 1171 (2004) 19 M Meyyappan, Carbon Nanotubes: Science and...

Ngày tải lên: 11/09/2015, 10:18

... Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures make electrons eject at a pretty low applied field and thereby saving the consumed energy of electronic ... low electron affinity and strong mechanical properties of DLC and the one-dimensional free-standing geometry of CNTs by coating the DLC thin films directly onto the surface of the vertically-aligned ... primarily c composed of carbon Fig 6.5 shows the carbon 1s core level XPS spectrum of the film Two peaks with the binding energy (BE) of 284.5 and 285.2 eV confirm a high sp3 content of 126 Chapter...

Ngày tải lên: 11/09/2015, 10:18

... surface is rather flat and the average diameter of these nanotubes is comparable to that 136 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell ... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures Fig 6.11 Top and cross-sectional view SEM images of composite emitters (a) and (b) 100 ... Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures with the increase of ambient temperature during emission process, the work function of the...

Ngày tải lên: 11/09/2015, 10:18

... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures 6.4.2 FE Properties of the Hydrogenated Composite Emitters The FE J-E curves of the pristine ... layer in air and result in a raised valence band maximum of diamond, in other words, a 143 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell ... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures Fig 6.15 Carbon 1s core level XPS spectra of the (a) 50 nm ta C coated CNTs and (b) 10...

Ngày tải lên: 11/09/2015, 10:18

... “Hydrogenation and its effects on the field emission characteristics of tetrahedral amorphous carbon coated carbon nanotubes Journal of Physical Chemistry C (Accepted) Jun Yu, Kuan He Choo, Lifang Niu, and ... emission properties of hydrogenated tetrahedral amorphous carbon/ carbon nanotubes nanostructures” Electrochemical and Solid-State Letters 13, K80 (2010) (selected for publication in Virtual Journal of ... List of Publications J Yu, C H Sow, Andrew T S Wee, and Daniel H C Chua “Enhanced field emission of vertically-aligned core-shell carbon nanotubes with molybdenum oxide encapsulation” Journal of...

Ngày tải lên: 11/09/2015, 10:18

... single wall carbon nanotubes Carbon 2002, 40:2043-2061 24 Deng F, Zheng QS, Wang LF: Effects of anisotropy, aspect ratio, and nonstraightness of carbon nanotubes on thermal conductivity of carbon ... cross-link density and hence, on the final properties of the system Thus, we aimed at studying the effect of two types of carbon- based nanofillers, in particular, nanotubes and graphene sheets, ... modes of the graphene and of the polymeric matrix plays a dominant role on the thermal conductivities of the liquid and solid states Keywords: carbon nanotubes; graphene; nanocomposites; nanofluids;...

Ngày tải lên: 20/06/2014, 23:20

... rolled up sheets of graphene, and, as might be expected, many of the mechanical and electronic properties of nanotubes are derived from or closely related to corresponding properties of graphene (Amusingly, ... been obtained for BN and other noncarbon nanotubes as well BN nanotubes share the same sp2 structure of carbon nanotubes and thus many mechanical properties similarities exist Nanotubes are being ... the order of its diameter is nm (Fig 2) Quantum Theories for Carbon Nanotubes Fig 31 Circumferential vector map of carbon nanotubes and their electronic transport properties Courtesy of T Matsumoto...

Ngày tải lên: 04/06/2014, 14:43

... energy of singlewalled carbon nanotubes Appl Phys Lett 1999, 16:2307-2309 Peigney A, Laurent C, Flahaut E, Bacsa RR, Rousset A: Specific surface area of carbon nanotubes and bundles of carbon nanotubes ... field of cancer therapy are briefly introduced Physicochemical properties of CNTs Carbon nanotubes are a huge cylindrical large molecules consisting of a hexagonal arrangement of sp2 hybridized carbon ... visualization of DNA and proteins on carbon nanotubes Adv Mater 1998, 10:701-703 Vigolo B, Pénicaud A, Coulon C, Sauder C, Pailler R: Macroscopic fibers and ribbons of oriented carbon nanotubes Science...

Ngày tải lên: 20/06/2014, 22:20

... polymerization of phenoxybenzoic acids [11] and functionalization of closely related carbon materials such as vapor-grown multi-walled carbon nanofibers (MWCNFs) [12, 13] and multi-walled carbon nanotubes ... Results and Discussion Without purification, most of the as-prepared SWCNTs contain approximately 60–70 wt% of impurities such as carbonaceous fragments, amorphous carbons, and small amount of graphite ... implies the higher purity of SWCNTs The TEM image of the as-received SWCNTs shows that there are large portions of carbonaceous and metallic impurities (Fig 1c) On the other hand, the PPA treated...

Ngày tải lên: 22/06/2014, 00:20