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A Ni(OH)2-graphene hybrid with a three dimensional (3D) interconnected graphene network was prepared by a simple one-pot hydrothermal method. The 3D structure constructed of flexible and planar graphene sheets (GS) forms an effective electron transfer network and provides a continuous pore structure for ion transport. Moreover, this structure avoids the aggregation of GS and Ni(OH)2, resulting in...
Graphene is used as a barrier film to suppress the “shuttle effect” and to improve the performance of activated carbon–sulphur hybrid cathode materials in a lithium-sulphur battery by forming a core–shell structure. Graphene wraps around the activated carbon–sulphur hybrid to form a core–shell structure, in which the porous carbon framework stores most of the sulphur and the graphene layer suppresses...
Polyacrylonitrile-based carbon fiber bundles, with two sides fixed, were heated in a graphitization furnace with temperature profiles similar to those used in the preparation of carbon/carbon composites. The microstructure of the microvoids formed was characterized by small-angle X-ray scattering and high resolution transmission electron microscopy (HR-TEM). Results showed that the average radius...
The size and surface chemistry of graphene oxide (GO) dispersed in an aqueous solution are tuned by adjusting the pH value of the parent GO hydrosol. This method is based on the protonation of the carboxyl groups on GO nanosheets (GONs) in an acidic environment and the partial removal of oxygen-containing functional groups in strong basic conditions. GONs with a high electrochemical activity can be...
Recent exciting findings of the biological interactions of graphene materials have shed light on potential biomedical applications of graphene-containing composites. Fabrication of bulk composites in particular nanostructured coatings from nanosize particles/sheets yet remains elusive. Here we report hydroxyapatite (HA) and HA–graphene nanosheet (GN) composites synthesized by liquid precipitation...
High-energy ball milling has been used to produce nanocrystalline and amorphous structures in nature graphite, but Raman spectroscopy analysis shows that the structure of the amorphous phase produced by ball milling is less disordered than the amorphous structures in ion-beam bombarded graphite and sputtered amorphous carbon. The band intensity ratio (I D /I G ) increases first and...
Oriented graphite/polymer composite sheets were prepared using natural, crystalline flake graphites as raw materials, polyvinyl butyral as binders, polyethylene glycol and dibutyl phthalate as plasticizers by a tape-casting method at room temperature. The dependences of the binder contents and the blade heights on the orientation of the composite sheets were studied, and the effect of the orientation...
A novel electrochemical grafting of carbon nanotubes (CNTs) on the surfaces of carbon fibers using water as dispersive medium was achieved by the electrolysis of carboxylic acid-functionalized CNTs. The resulting CNT-hybridized carbon fibers showed a selective distribution of CNTs at active carbon sites on the fibers associated with the edge graphite layers and defects, without destroying the crystalline...
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