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Graphene oxide was produced using a modified Hummers method and used to produce a MnSO4–graphene oxide (MnSO4–GO) hybrid which was then transformed into a MnO–graphene hybrid by precipitation with NaOH followed by hydrogen reduction. The MnO–graphene hybrid shows a high specific capacity of 870mAhg−1 at 100mAg−1 as an anode material for lithium ion batteries, which is much higher than that of bare...
Nitrogen-doped mesoporous carbon nanosheets (NMCNs) were prepared from coal tar and melamine using a layered MgO as template. Porous structures and nitrogen doping levels were readily tuned by adjusting experimental parameters. NMCNs show high specific capacities and excellent cyclic stabilities as anode materials for lithium ion batteries. A sample prepared under optimum conditions shows a high reversible...
Nitrogen-doped carbon aerogels (NCAs) were prepared by introducing tripolycyanamide during the synthesis of organic aerogel precursors, and the effects of the nitrogen content on the pore structure of NCAs and the photovoltaic properties of dye-sensitized solar cells (DSSCs) based on NCA counter electrodes (CEs) were studied. With the increase of nitrogen-doped concentration, the pore size of NCAs...
Vertically-aligned carbon nanotube (VACNT) composite membranes were fabricated by impregnating carbon nanotube (CNT) forests with poly-para-xylylene (parylene-C) through room-temperature chemical vapor deposition (CVD). Transport properties of diverse gases through the CNT/parylene membranes were investigated. The gas permeances scaled inversely with their molecular weights in accordance with Knudsen...
Nanoporous carbons with a hierarchical pore structure were prepared by a combination of hard-templating of a thermosetting phenolic resin containing silica nanoparticles, pyrolysis and KOH activation. The influence of the amount of KOH on the pore structure of the templated and activated carbons was investigated by N 2 adsorption and the effect of pore structure on the CO 2 adsorption...
A route to producing multi-walled carbon nanotubes (MWCNTs) was reported, in which polyacrylonitrile microspheres (PANMSs) were assembled into one-dimensional strings of carbon spheres and transformed to carbon nanotubes at 1000°C. It was found that the diameters of the MWCNTs are uniform and correlated with the size of the PANMSs used. Structures of intermediate products obtained by stopping the...
A new approach is described for preparing carbon foam (CF) through coaxial electrohydrodynamic atomization (EHDA). Using polyacrylonitrile (PAN) and borneol as a carbonaceous precursor and a blowing agent, respectively, hybrid PAN-borneol films were prepared and transferred to a honeycomb PAN membrane through blowing, drying, and pre-oxidation with the CF prepared by carbonization of the PAN film...
Vertically-aligned carbon nanotube (CNT) forests were modified using radio-frequency Ar/O 2 plasma. The effect of plasma parameters on surface morphology, atomic composition and structure of CNT forests were studied. Functionalized CNT forests preserved vertical alignment and showed dramatic change in surface morphology, and bundle-like patterns were observed from scanning electron microscopy...
We present a rational field emitter array architecture composed of thin multi-walled carbon nanotube “loops” which simultaneously satisfies the important requirements for practical applications. We achieved low turn-on voltage (1.27V/μm for 10μA/cm 2 emission), high enhancement factor (2400), uniformity, and long-term emission stability exceeding 10,000h at 1mA/cm 2 , where each of...
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