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The electrochemical doping of single-walled carbon nanotubes (SWCNTs) in 1M Et 4 NBF 4 in acetonitrile was investigated by in situ Raman spectroscopy. The capacitance was determined to be 82F/g for the positive and 71F/g for the negative SWCNT electrode, respectively, which approaches the typical values for microporous activated carbons used in supercapacitors. The changes in the Raman...
Experimental and analytical techniques are introduced for the quantitative, nanoscale mapping of chemical bonding information in carbon-based materials. With these techniques, the spatial orientation of graphitic crystallites in tetrahedrally bonded amorphous carbon was imaged. Simultaneously, the percentage of sp 2 - and sp 3 -bonded carbon could be mapped quantitatively, all with...
Carbon spheres (CSs) retaining the morphology of potato starch were prepared by a two-step process: impregnation followed by carbonization. In this process, potato starch was impregnated in NH 4 Cl solution for 1h. The mechanism of preparation was proposed. The presence of HCl catalyzes the dehydration of impregnated starch at lower temperature than its melting point, which destroys the crystallites...
A new approach for the growth of carbon nanotubes (CNTs) is reported. In particular, the growth is mediated by adding methanol into n-hexane with dissolved ferrocene. The first mediating effect is that the thermal decomposition of n-hexane and consequent widespread formation of carbon particles can be suppressed. Thus, truly continuous production of CNTs can be realized at high temperature. The second...
We describe the systematic study of multi-walled carbon nanotubes with different nitrogen doping produced by aerosol chemical vapor deposition. Benzylamine:toluene mixtures of 0:100, 5:95, 10:90, 25:75, 50:50, 75:25 and 100:0 were thermally decomposed at 800–900°C under argon at atmospheric pressure, whereby the nitrogen content of the bulk material was varied between 0 and 2.2at%. We also show how...
Carbon nanotubes (CNTs) were grown directly on substrates by alcohol catalytic chemical vapor deposition using a Co–Mo binary catalyst. Optimum catalytic and reaction conditions were investigated using a combinatorial catalyst library. High catalytic activity areas on the substrate were identified by mapping the CNT yield against the orthogonal gradient thickness profiles of Co and Mo. The location...
Buckling characteristics of functionalized single-walled carbon nanotubes under axial compression are investigated by molecular mechanics simulation. The influences of the content, the distribution density and the location of the sp 3 -hybridized carbon atoms as well as the chirality on the critical buckling strains of functionalized single-walled carbon nanotubes are carefully studied. The...
Electron beam irradiation with moderate fluences of approximately 10 16 –10 17 electrons per cm 2 is used for controllable, bulk-scale cutting of single-walled carbon nanotubes (SWCNTs). The effectiveness of high energy electron irradiation in cutting SWCNTs is dependent on the nature of the sidewall. While pristine nanotubes are very stable under irradiation conditions, ozonated...
Comparison of graphite nanoplatelet (GNP) and carbon black (CB) pastes as thermal interface materials shows that the optimum filler content for attaining the maximum thermal contact conductance (copper proximate surfaces, roughness 15μm) are 2.4, 15 and 2.4vol.% for GNP, CB (Tokai) and CB (Cabot), respectively. Except for CB (Cabot), the optimum filler content is diminished when the roughness is decreased...
Activated carbons (ACs) with different textural and surface chemistry properties obtained by HNO 3 oxidation, N 2 -thermal treatment, and aqueous non-thermal plasma treatment were studied to analyze their behaviors in degradation of toxic organic pollutant parachlorophenol (4-CP) by the pulsed discharge plasma process in aqueous solution. N 2 -heated AC in the 50–110μm diameter...
Exfoliated graphite materials had been rapidly and efficiently prepared by microwave irradiation in a short time (about 4min including 3min mixing and 1min microwave irradiation). The promotion of the intercalation by microwave irradiation was proven by X-ray diffraction. With increasing content of oxidant and intercalation agent, the expanded volume of exfoliated graphite increased at first and then...
Biomorphic carbide ceramics, TiC and SiC, derived from paper performs by chemical vapor infiltration were converted into high porous carbon by carbide-derived carbon (CDC) approach using selective etching in chlorine or hydrogen/chlorine gas mixture in a temperature range of 400–1200°C. A comparative study of both carbide precursors was performed regarding reaction kinetics, influence of hydrogen...
Pyrolytic carbon coatings were deposited on top of alumina particles at deposition temperatures from 1250°C to 1450°C and with acetylene and acetylene/propylene mixtures at concentrations between 25% and 70%, v/v. The anisotropy of pyrolytic carbon coatings was quantified using electron diffraction and Raman peak intensities, and related to the deposition conditions and microstructure. In correlation...
Several nanometer-thick graphene oxide films deposited on silicon nitride-on silicon substrates were exposed to nine different heat treatments (three in Argon, three in Argon and Hydrogen, and three in ultra-high vacuum), and also a film was held at 70°C while being exposed to a vapor from hydrazine monohydrate. The films were characterized with atomic force microscopy to obtain local thickness and...
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