... physical propertiesof 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 ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding propertiesof double-wall nanotubes and arrays ofnanotubes are...
... physical propertiesof 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 ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding propertiesof double-wall nanotubes and arrays ofnanotubes are...
... physical propertiesof 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 ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding propertiesof double-wall nanotubes and arrays ofnanotubes are...
... physical propertiesof 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 ... implications of symmetry on the vibrational and electronic structure of ID carbon nanotube systems are considered The corresponding propertiesof double-wall nanotubes and arrays ofnanotubes are...
... 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...
... thermoelectric propertiesof a series of zigzag and chiral carbonnanotubes which exhibit interesting diameter and chirality dependence Our calculated results indicate that these carbonnanotubes ... dynamics of singlewalled carbonnanotubes Phys Rev B 2003, 67:045413 33 Esfarjani K, Zebarjadi M, Kawazoe Y: Thermoelectric propertiesof a nanocontact made of two-capped single-wall carbonnanotubes ... 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...
... propertiesofcarbonnanotubes 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 ... 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 ... bonds where each carbon atom is bonded to other carbon atoms 1.1.2 Mechanical propertiesofcarbonnanotubesCarbon nanotube is known to possess superior mechanical properties These properties have...
... Background 1.2 CarbonNanotubes 1.2.1 Discovery ofCarbonNanotubes 1.2.2 Bonding Structures ofCarbonNanotubes 1.2.3 PropertiesofCarbonNanotubes 1.2.4 Applications ofCarbonNanotubes 2 13 ... outer shell of the CNTs, whatever type ofelectronicproperties may be [32, 33] Field Emission PropertiesofCarbonNanotubes It is known that a CNT is a very thin filament-like carbon molecule ... 49 CHAPTER NANOTUBES SYNTHESIS OF VERTICALLY-ALIGNED CARBON 51 4.1 Introduction 51 4.2 Experimental Details 54 4.3 Results and Discussion 4.3.1 Characterization of the As-Grown Carbon Nanotubes...
... 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 propertiesof semiconductors could on 17] ... Influencing Parameters of Field Emission Based on the above review of the F-N theory and the literature on FE from semiconductors, it is obvious that the FE propertiesof materials are essentially ... FE performances of emitters Threshold voltage, defined as the anode voltage where an emission current of 10-9 A was observed, is an essential index to evaluate the FE propertiesof emitters [35]...
... 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 ... outermost levels of atoms - the valence levels The advantage of using such a UV radiation over X-rays is the very narrow line width of the radiation and the availability of high flux of photons from...
... 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...
... 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 The FE properties ... the binding 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 ... (eV) Fig 6.5 Carbon 1s core level XPS spectrum confirms high sp3 content of the DLC films 127 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell...
... 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 ... flat and the average diameter of these nanotubes is comparable to that 136 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated CarbonNanotubes Core-Shell Nanostructures ... 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 Propertiesof 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 ... Carbon Coated CarbonNanotubes Core-Shell Nanostructures performance of the emitters and there exists an optimum thickness of the ta-C coating film, i.e., 50 nm in this case With the change of...
... the FE propertiesof the pristine CNTs Results showed that the FE propertiesof the CNTs would be affected both by the thickness of the ta-C coating films and by the treatment duration of the ... Emission Propertiesof Hydrogen Plasma Post-Treatment on Tetrahedral Amorphous Carbon Coated CarbonNanotubes , IEEE International NanoElectronics Conference (INEC) 2010, City University of Hong ... 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...
... 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 ... final propertiesof 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 ... observed The results 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,...
... important results have been obtained for BN and other noncarbon nanotubes as well BN nanotubes share the same sp2 structure ofcarbonnanotubes and thus many mechanical properties similarities exist Nanotubes ... oxygen sensitivity ofelectronicpropertiesofcarbon nanotubes, Science 287, 1801 (2000) [81] J Hone, M Whitney, C Piskoti and A Zettl, Thermal conductivity of single-walled carbon nanotubes, Phys ... giving rise to many kinds of new crystalline carbon phases [3] In the case ofcarbon nanotubes, existence of many kinds ofnanotubes in various samples has also been confirmed experimentally using...
... 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 ... Physicochemical propertiesof 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 ... 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...
... 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 ... 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 was 1.3, which was much lower than 5.0 of the PPA treated...