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Ultrathin graphitic nanostructures are grown inside solid activated carbon particles by catalytic graphitization method with the aid of Ni. The graphitic nanostructures consist of 3–8 graphitic layers, forming a highly conductive network on the surface of disordered carbon frameworks. Owing to the ultrathin characteristic of the produced graphitic nanostructures, the resulted porous graphitic carbons...
The topological microstructure of micro-coiled carbon fibers (MCFs) before and after high temperature treatment (HTT) was explored and characterized. Results suggested that as-grown MCFs had an annular ring-like structure in the cross section and a herringbone-like structure in the longitudinal section, but the orientation range of graphitic domains was wide. After HTT, the coiled fibers consisted...
We report the positive effect of an Al underlayer for enhancing the growth of carbon nanotubes (CNTs) on Si substrates. The catalyst used for the growth was a sputter-deposited Fe–Si thin film and the growth temperature was 370°C. The morphology, composition, microstructure, and crystalline structure of the Fe–Si films with and without an Al underlayer having different thicknesses were examined. Correlation...
We synthesized centimeter-scale single- to few-layer graphene (FLG) films via chemical vapor deposition (CVD) on Ni foils. We demonstrates that the precipitation mechanism may not be the only important mechanism in the formation of graphene by CVD in Ni system, and that controlling the cooling rate in the CVD process may not be the appropriate way to control the thickness of graphene films. In addition,...
Non-isothermal growth of carbon nanotubes (CNTs) was studied in order to obtain the activation energy. CNTs were grown on an Fe–Si catalyst using microwave plasma-enhanced chemical vapor deposition of CH 4 . During the growth, the substrate was heated by the plasma such that its temperature increased with the growth until equilibrium was reached. In other words, the CNT growth took place under...
A method for the synthesis of millimeter-scaled graphene films on silicon carbide substrates at low temperatures (750°C) is presented herein. Ni thin films were coated on a silicon carbide substrate and used to extract the substrate’s carbon atoms under rapid heating. During the cooling stage, the carbon atoms precipitated on the free surface of the Ni and formed single-layer or few-layer graphene...
A recently developed self-assembled method, involving the use of a single metal target and a fixed substrate in a sputter deposition chamber, was used for the growth of various metal-containing diamond-like carbon thin films. The metals used include, Cu, Pt, and Ni. The resulting films consist of self-assembled alternating dark and bright layers, both of which constitute a period. The dark layer was...
X-ray absorption near-edge structure (XANES) spectroscopy and photoelectron spectroscopy (PES) have been used to investigate single-walled carbon nanotubes (SWNTs) modified by immersion in a HBr solution at room temperature. After treatment XANES spectra of SWNTs show a new pronounced feature, which has been assigned to new bonds between the sidewall of the SWNTs and Br atoms. This investigation demonstrates...
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