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Multilayer graphene (MLG) grown by chemical vapor deposition (CVD) is a promising material for electronic and optoelectronic devices. Understanding the stacking configuration and interlayer coupling of MLGs is technologically relevant and of importance for the device applications. Here, we reported a kind of twisted MLGs (tMLGs), in which only one twist angle was revealed from the twist-related modes,...
Three-dimensional (3D) graphene-based porous materials with a combination of low density, superelasticity, excellent mechanical resilience and tunable functionalities can be used in diverse applications. Here we report an approach of fabricating the stable and flexible 3D graphene aerogel materials with tunable functionality via a general silane-assisted processing that maintains an effective control...
Carbon nanotubes (CNTs) are novel reinforcement of Mg-based composites because of their attractive mechanical properties. However, in general, nanosize CNTs did not completely impart their exceptional properties to the Mg matrix because of the poor interfacial bonding between CNTs and the matrix and the aggregation of CNTs, which largely limit their applications in Mg-based composites. In this study,...
Epoxy composites filled with both graphene oxide (GO) and diglycidyl ether of bisphenol-A functionalized GO (DGEBA-f-GO) sheets were prepared at different filler loading levels. The correlations between surface modification, morphology, dispersion/exfoliation and interfacial interaction of sheets and the corresponding mechanical and thermal properties of the composites were systematically investigated...
The effect of dispersion state of graphene on mechanical properties of graphene/epoxy composites was investigated. The graphene sheets were exfoliated from graphite oxide (GO) via thermal reduction (thermally reduced GO, RGO). Different dispersions of RGO sheets were prepared with and without ball mill mixing. It was found that the composites with highly dispersed RGO showed higher glass transition...
Carbon nanotubes (CNTs) were synthesized on carbon fibers by a modified thermal chemical vapor deposition (CVD) method. The fibers were first treated at a temperature of 973K and then treated by a mixture of sulfur acid and nitric acid with a volume ratio of 1:3 to improve the dispersion of catalyst precursor (Fe (NO 3 ) 3 ·9H 2 O) on the surface before impregnation with a...
Single-walled carbon nanotubes (SWCNTs) with high purity and very narrow diameter distribution have been synthesized using the dc arc-discharge method with Y–Ni alloy as catalyst and selenium (Se) as promoter. The SWCNTs show a very narrow diameter distribution mainly at about 1.5nm, and can further be readily purified up to >99% purity with traditional purification including HNO 3 reflux...
Carbon-encapsulated iron nanostructures were prepared by co-carbonization of a mixture of aromatic heavy oil and ferrocene. The morphologies and structural features of the iron/carbon composites were investigated using transmission electron microscopy, high-resolusion transmission electron microscopy and X-ray diffraction measurements. It was found that, by increasing the reaction temperature from...
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