... properties of the nanotubes The symmetry groups for carbonnanotubes can be either symmorphic [such as armchair (n,n)and zigzag Physics ofcarbonnanotubes 29 Table Parameters ofcarbonnanotubes ... progress in research on carbonnanotubes and related materials 'The birth of the field ofcarbonnanotubes is marked by the publication by Iijima of the observation of multi-walled nanotubes with outer ... intrinsic structures are rather like that of the annual growth of trees The structureof VGCFs, especially those with hollow cores, are very similar to the structureof arc-formed carbon nanotubes...
... properties of the nanotubes The symmetry groups for carbonnanotubes can be either symmorphic [such as armchair (n,n)and zigzag Physics ofcarbonnanotubes 29 Table Parameters ofcarbonnanotubes ... progress in research on carbonnanotubes and related materials 'The birth of the field ofcarbonnanotubes is marked by the publication by Iijima of the observation of multi-walled nanotubes with outer ... intrinsic structures are rather like that of the annual growth of trees The structureof VGCFs, especially those with hollow cores, are very similar to the structureof arc-formed carbon nanotubes...
... properties of the nanotubes The symmetry groups for carbonnanotubes can be either symmorphic [such as armchair (n,n)and zigzag Physics ofcarbonnanotubes 29 Table Parameters ofcarbonnanotubes ... progress in research on carbonnanotubes and related materials 'The birth of the field ofcarbonnanotubes is marked by the publication by Iijima of the observation of multi-walled nanotubes with outer ... intrinsic structures are rather like that of the annual growth of trees The structureof VGCFs, especially those with hollow cores, are very similar to the structureof arc-formed carbon nanotubes...
... properties of the nanotubes The symmetry groups for carbonnanotubes can be either symmorphic [such as armchair (n,n)and zigzag Physics ofcarbonnanotubes 29 Table Parameters ofcarbonnanotubes ... progress in research on carbonnanotubes and related materials 'The birth of the field ofcarbonnanotubes is marked by the publication by Iijima of the observation of multi-walled nanotubes with outer ... intrinsic structures are rather like that of the annual growth of trees The structureof VGCFs, especially those with hollow cores, are very similar to the structureof arc-formed carbon nanotubes...
... 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 films, ... size of titania symbols are representative of the lack (white) or abundance (yellow) of Ti3+ states and of the crystallite size obtained by XRD; the size of the arrows illustrate the magnitude of ... the identification of small changes in the patterns of the composite films; the narrower and more symmetric shape of the MWCNT peak at 2Â = 26◦ indicates the lost of amorphous carbon after functionalization...
... top It can also be stated that the edges of the Figure STM images of the edges of the graphene islands (a) 23 × 23 nm2 STM image of a monolayer on top of the (3 × 3) SiCreconstructed surface This ... 20 21 22 23 24 Page of atmospheric pressure graphitization of silicon carbide Nat Mater 2009, 8:203 Kim S, Ihm J, Choi HJ, Son YW: Origin of anomalous electronic structures of epitaxial graphene ... http://www.nanoscalereslett.com/content/6/1/171 Page of (a) (b) (c) (d) Figure STM images of a 6H-SiC(000-1) sample after graphitization (same sample as in figure 1) (a) 300 × 300 nm2 STM image of few layers of graphene grown...
... Thermal conductivity ofcarbonnanotubes Nanotechnology 2000, 11:65-69 30 Padgett CW, Brenner DW: Influence of chemisorption on the thermal conductivity of single-wall carbonnanotubes Nano Lett ... dynamics of singlewalled carbonnanotubes Phys Rev B 2003, 67:045413 33 Esfarjani K, Zebarjadi M, Kawazoe Y: Thermoelectric properties of a nanocontact made of two-capped single-wall carbonnanotubes ... performance of zigzag and chiral carbonnanotubes 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...
... properties ofcarbonnanotubes 1.1.3 Applications ofcarbonnanotubes 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 CNTs ... achiral carbonnanotubes The latter comprises of both zigzag and armchair carbonnanotubes This categorization is done based on the orientation of carbon- carbon (C-C) bonds Orientation of C-C ... the shape of a cylinder Depending on the geometry of CNT, the following categories of CNT can be found Single-walled and multi-walled carbonnanotubes CNTs as single-walled carbonnanotubes (SWNTs)...
... Background 1.2 CarbonNanotubes 1.2.1 Discovery ofCarbonNanotubes 1.2.2 Bonding Structures ofCarbonNanotubes 1.2.3 Properties ofCarbonNanotubes 1.2.4 Applications ofCarbonNanotubes 2 13 ... through these years ii Table of Contents Table of Contents ACKNOWLEDGEMENTS TABLE OF CONTENTS ABSTRACT I III VII LIST OF TABLES IX LIST OF FIGURES X LIST OF ABBREVIATIONS LIST OF SYMBOLS XV XVII CHAPTER ... CarbonNanotubes 4.3.2 Catalytic Growth Mechanism ofCarbonNanotubes 4.3.3 Function of Metal Catalyst in CNT Growth 4.3.4 Growth Rate ofCarbonNanotubes with Fe Catalyst 56 56 60 62 66 4.4 Summary...
... space charge effects, overheating of the emitter tips or the low concentration of the carriers in the tips, conduction band of semiconductors [15-17] FE properties of semiconductors could on 17] ... concentration of carriers would influence the band structures of the semiconductors, resulting in varied emission barrier height and heights thus diverse FE performance [20, 21] Furthermore, the origin of ... lifetime of the emitters [53] Therefore, one primary issue about FE devices is to improve the corrosion resistance of the emitters One of the methods, i.e., coating the emitters with materials of high...
... spectrum of a mixture of elements is approximately the sum of the peaks of the individual constituents Generally, identification of chemical states can be made from exact measurements of peak ... 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...
... covered with amorphous carbon, which is the product of the thermal deposition of hydrocarbon [3] 52 Chapter Synthesis of Vertically-Aligned CarbonNanotubes In terms of other CNT growth approaches, ... Schematic setup of the PECVD system used 55 Chapter Synthesis of Vertically-Aligned CarbonNanotubes 4.3 Results and Discussion 4.3.1 Characterization of the As-Grown CarbonNanotubes Fig 4.2 ... the hollow part of Fig 4.4 TEM images of the as-grown CNTs obtained with Fe catalyst 58 Chapter Synthesis of Vertically-Aligned CarbonNanotubes the nanotube that a few layers of graphene sheets...
... Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures neighbors giving rise to three-dimensional interconnected structureofcarbon atoms [1] This structure ... energy (BE) of 284.5 and 285.2 eV confirm a high sp3 content of 126 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures ... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures 6.3.4 FE Performance of the Composite Emitters with Varied Thicknesses of Coating Films...
... Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures of the pristine CNTs Hence, it is reasonable to assume that the coated tips of these nanotubes ... average diameter of these nanotubes is comparable to that 136 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures Fig 6.10 ... Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures with the increase of ambient temperature during emission process, the work function of the...
... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures 6.4.2 FE Properties of the Hydrogenated Composite Emitters The FE J-E curves of the pristine ... Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures Fig 6.15 Carbon 1s core level XPS spectra of the (a) 50 nm ta C coated ... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures performance of the emitters and there exists an optimum thickness of the ta-C coating...
... characteristics of tetrahedral amorphous carbon coated carbonnanotubes Journal of Physical Chemistry C (Accepted) Jun Yu, Kuan He Choo, Lifang Niu, and Daniel H C Chua “Synthesis of three-dimensional ... discussion of this study have provided a better understanding of the FE enhancement mechanism of the multilayer structured field emitters The main factors influencing the FE properties of the composite ... molybdenum oxide-coated carbonnanotubes core-shell nanostructures” Journal of Materials Science 46, 4858 (2011) Jun Yu, and Daniel H C Chua “Enhanced field emission properties of hydrogenated tetrahedral...
... single wall carbonnanotubesCarbon 2002, 40:2043-2061 24 Deng F, Zheng QS, Wang LF: Effects of anisotropy, aspect ratio, and nonstraightness ofcarbonnanotubes on thermal conductivity ofcarbon ... properties of the system Thus, we aimed at studying the effect of two types of carbon- based nanofillers, in particular, nanotubes and graphene sheets, on the thermal conductivity of an uncured ... indicate that MWNTs are the most effective carbon nanofillers to improve the K of liquid resins Indeed, the K of the nanofluids gradually increased as a function of MWNT content, reaching a 70% improvement...
... addition to isolated individual carbon nanotubes, condensed phases of nanotubes, i.e., bundles of single-walled carbonnanotubes and concentric multiwalled carbon nanotubes, are very important ... applications 3.3 Electronic Structureof Chiral CarbonNanotubes First-principles electronic structure studies of chiral carbonnanotubes other than achiral zigzag and armchair nanotubes have scarcely ... role of essential importance in the field ofcarbonnanotubes as will be reviewed in this chapter, in which an overview of theories applied to carbonnanotubes is presented and the advantages of...
... energy of singlewalled carbonnanotubes Appl Phys Lett 1999, 16:2307-2309 Peigney A, Laurent C, Flahaut E, Bacsa RR, Rousset A: Specific surface area ofcarbonnanotubes and bundles ofcarbonnanotubes ... applications of single walled carbonnanotubes Curr Med Chem 2010, 17:10-24 Ito Y, Venkatesan N, Hirako N, Sugioka N, Takada K: Effect of fiber length ofcarbonnanotubes on the absorption of erythropoietin ... properties of CNTs Carbonnanotubes are a huge cylindrical large molecules consisting of a hexagonal arrangement of sp2 hybridized carbon atoms (C-C distance is about 1.4 Ǻ) The wall of CNTs is...
... 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 carbonnanotubes ... 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 and metal catalysts ... present in the tubular wall structure and the G-band in the 1550–1600 cm-1 region of spectrum is due to the tangential C–C stretching of SWCNT carbon atoms [25] The ID/IG value of the TMPBA-g-SWCNT...