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Up to now, the cost-effective mass production of pristine graphene sheets remains a significant challenge. We report a binary solvent system of dimethylformamide and n-butylalcohol that facilitates the high concentration production of unoxidized graphene through liquid-exfoliation assisted with sonication. A stable dispersion with concentration as high as 6.5mg/ml, was received via this method. The...
It is normally assumed that the sheet resistances under and outside the metal contact are identical when deriving specific contact resistivity of graphene from transmission line model. We considered the contact end resistance and obtained the sheet resistance under contact of 670Ω/□, which is much different from that outside the contact of 1840Ω/□. Considering the difference, the value of specific...
Petroleum coke (PC) was modified by HClO 4 oxidization. Activated carbons (ACs) were prepared using a mass ratio of KOH/modified PC of 3:1 (denoted OAC-3) and a KOH/PC mass ratio of 4:1 (denoted AC-4) for comparison. XRD, I 2 adsorption, N 2 adsorption and cyclic voltammograms were used to investigate the influence of HClO 4 oxidization on the structure of the PC and...
Carboxylated carbon nanotube-filled polymethylmethacrylate (CNT/PMMA) ultra-long composite nanofibers were prepared by electrospinning of in-situ polymerized CNT/PMMA bulk composites under shear flow in a quartz capillary tube. They were characterized by SEM, TEM and FT-IR. The degree of orientation of the CNTs in the nanofibers was investigated by polarized Raman spectroscopy. The force imposed on...
Hard carbon with perfect spherical morphology was prepared for the first time by a hydrothermal method. It has controllable monodispersed particle size and a smooth surface. Transmission electron microscopy shows that there are a large quantity of uniform nanopores of about 0.4 nm in diameter and only very few parallel graphene sheets exist within the spherules. This hard carbon material has a specific...
SiC coatings prepared by chemical vapor deposition and from polycarbosilane (PCS) solution; also, SiO 2 and Al 2 O 3 coatings by Sol-Gel method were investigated in detail, to improve the oxidation resistance of carbon fibers as important reinforcement in advanced composites. A β-SiC coating was obtained on carbon fibers by pyrolysis of CH 3 SiCl 3 and H ...
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