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Preparation of Fe and Pd co-doped g-C3N4 was described, using dicyandiamide monomer, and [1, 1′-Bis (diphenylphosphino) ferrocene] dichloropalladium (II) as precursor. X-ray powder diffraction, Fourier transform infrared spectra, Raman spectra and transmission electron microscopy were used to confirm the formation of bulk Fe-Pd/C3N4, X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy...
Three-dimensional (3D) porous graphene materials with few layer nature and non-stacked structural feature afford significant advantages in high electrical conductivity, large surface area, and interconnected porous nanostructures. However, the structure evolution of porous graphene under high temperature is poorly understood. In this contribution, 3D double-layer templated graphene (DTG) composed...
Carbon fiber reinforced SiC matrix composites (Cf/SiC) were fabricated through chemical vapor infiltration. Effects of SiC content on the mechanical and electromagnetic properties of the as-prepared materials were studied systematically. The high volume fraction of SiC matrix is beneficial to the transfer of load to carbon fiber. With the increase of SiC content from 21.5 to 42.2 vol.%, the total...
Thermally reduced graphene oxide was pretreated consecutively in solutions of SnCl2 in HCl and PdCl2 in HCl. The resulting material was then plated with nickel nanoparticles under sonication to prepare Ni/graphene nanocomposites. XRD, TEM and EDS were used to investigate the microstructure, elemental composition and the chemical plating mechanism. Results show that Sn nanoparticles are distributed...
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...
Corn starch-based monolithic porous carbons were prepared by gelatinization of corn starch with or without nickel acetate as a structure modifier, followed by freeze drying and carbonization. The effect of gelatinization parameters such as the concentrations of the starch and addition of nickel acetate on the pore structures of the monoliths was investigated. It was found that the crystallinity of...
Graphene oxide (GO) was employed as the sizing agent for continuous carbon fiber (CF) tows by an electrophoretic deposition and subsequent thermal annealing. The GO sheets were tightly coated and covalently attached to CF surfaces. Such reduced GO-deposited CFs exhibit a significant increase in surface roughness as compared to the bare CFs, which leads to an improvement in the interfacial shear strength...
The surface functional groups of thermally reduced graphene nanosheets (TRG) prepared by vacuum promoted thermal expansion of graphene oxide are tailored by progressive carbonization. The residual carbon ratios after annealing at various temperatures from 250 to 1000°C increase progressively from 44.3 to 84.8%. The oxygen containing functional groups are intensively removed at higher annealing temperature...
A free-standing graphene oxide film (GOF) obtained by self-assembly at a liquid/air interface was annealed in a confined space between two stacked substrates to form a free-standing highly conductive graphene film. Characterization indicates that the oxygen-containing functional groups (e.g. epoxy, carboxyl, and carbonyl) were removed as small molecules (e.g. H 2 O, CO 2 , and CO)...
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