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This work proposes a simple and low cost method to modify the surface of undoped and silicon-doped carbon/carbon composites (C/C) in order to widen their application field in particular when joined to metals. The C/C surface was modified using W, Mo and Cr in an attempt to improve its wettability by copper.W, Mo and Cr powders are applied to C/C surface by the slurry technique and successively heat...
Flexible, transparent, and conducting composite thin films, constructed from multi-walled carbon-nanotube-supported silver–platinum alloy nanoparticles (AgPt–MWCNT) on a flexible polyethylene terephthalate (PET) substrate through the combination of a two-step polyol process for synthesizing composites of carbon nanotubes (CNTs) and metallic nanoparticles (NPs) with an ultrasonic atomization-spin coating...
Multiwalled carbon nanotube (MWCNT)/acrylonitrile butadiene styrene (ABS) composites were prepared by a processing method using solvent–nonsolvent precipitation. Size distributions of MWCNT agglomerates in aqueous suspension were investigated in order to predict aspect ratio of nanotubes by evaluating the effects of sonication time, MWCNT content, and surfactant. Aspect ratios of MWCNTs were predicted...
Carbon nanofiber/poly(ether ether ketone) composites were prepared in the laboratory via a solvent-based method at 260°C using benzophenone. After fatigue testing, examination of the fracture surface shows unusual surface morphologies around the nanofibers that appear to be caused by the cyclic testing.
Graphene-supported monometallic (Pt) and bimetallic (CuPt 3 ) cubic nanocatalysts have been investigated as new positive electrode materials for improving the VO 2+ /VO 2+ redox process occurring in the vanadium redox flow batteries (VRB). High-resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM) have been employed to characterize...
Octopus-like carbon nanofibres with leg diameters as small as 9nm are reported, with a high yield over large areas, using a unique photo-thermal chemical vapour deposition system. The branched nature of these nanostructures leads to geometries ideal for increasing the surface area of contacts for many electronic and electrochemical devices. The manufacture of these structures involves a combination...
Carbon nanotubes (CNTs) show great promise to improve composite electrical and thermal conductivity due to their exceptional high intrinsic conductance performance. In this research, long multi-walled carbon nanotubes (long-MWCNTs) and its thin sheet of entangled nanotubes were used to make composites to achieve higher electrical and thermal conductivity. Compared to short-MWCNT sheet/epoxy composites,...
The elastic modulus of ultra-thin amorphous carbon films was investigated by integrating atomic force microscopy (AFM) imaging in contact mode with finite element analysis (FEA). Carbon films with thicknesses of ∼10nm and less were deposited on mica by electron beam evaporation and transferred onto perforated substrates for mechanical characterization. The deformation of these ultra-thin membranes...
The fabrication and field emission characteristics are reported for point-type carbon nanotube (CNT) emitters formed by transferring a CNT film onto a Ni-coated Cu wire with a diameter of 1.24mm. A Ni layer plays a role in enhancing the adhesion of CNTs to the substrate and improving their field emission characteristics. On firing at 400°C, CNTs appear to directly bonded to a Ni layer. With a Ni layer...
The sulfonation of graphene by coupling with the diazonium salts of sulfanilic (SA) acid and amino-4-hydroxy-2-naphthalenesulfonic (NSA) acid is studied. Coupling with the diazonium salt of NSA gives the highest degree of sulfonation. Composites of polyaniline (PANI) and sulfonated graphene (SG) are prepared by the polymerization of aniline in the presence of the SG. The materials have been characterized...
Graphite blocks produced from natural graphite flake have been studied by high-resolution transmission electron microscopy (HRTEM). Previously, the rhombohedral structure was widely considered as a mosaic distribution in a hexagonal host and was probably produced only by mechanical shear or milling. In present investigation, isolated rhombohedral crystallites have been detected in graphite blocks,...
The influence of the liquid environment on the formation of different carbon nanostructures by arcing processes, in particular liquid nitrogen (LN 2 ) and de-ionised water (DI-H 2 O), has been investigated. Large structural differences between the nanomaterials produced in the two cases are shown: the use of DI-H 2 O induces a large number of pentagon–heptagon defects in the...
Highly corrugated graphene sheets (HCGS) have been prepared by a rapid, low cost and scalable approach through the thermal reduction of graphite oxide at 900°C followed by rapid cooling using liquid nitrogen. The wrinkling of the graphene sheets can significantly prevent them from agglomerating and restacking with one another face to face and thus increase the electrolyte-accessible surface area....
Intercalation of various organic molecules into pillared carbon prepared from the pyrolysis of graphite oxide silylated with methyltrichlorosilane for three times was investigated. Liquid n-alkylamine molecules with various alkyl chain lengths were intercalated into the resulting pillared carbon and the interlayer spacing increased with increasing in the alkyl chain length, until it became a constant...
A one-pot solvothermal synthesis method was developed to prepare reduced graphene oxide (RGO) supported ferrite (MFe 2 O 4 , M=Mn, Zn, Co and Ni) hybrids using graphite oxide and metal ions (Fe 3+ and M 2+ ) as starting materials. The hybrids were characterized by X-ray powder diffraction, Raman spectra, field emission scanning electron microscopy, energy dispersive...
The conduction responses of semiconducting single-walled carbon nanotube (SWCNT) films irradiated by 6 and 15MV X-rays were evaluated. Results indicate that the average resistance–dose rate relations of the SWCNT network are quasi-linear and can be used for dosimetry measurements in medical radiation applications. The dynamic responses exhibit fluctuations which reveal an intrinsic feature of SWCNT...
Polyvinyl alcohol (PVA) hydrogels both pure and reinforced with two types of carbon nanoparticles (nanotubes and nanofibres) were studied as a candidate material for osteochondral defect repair. The carbon nanoparticles produced by chemical vapour deposition were characterised by Raman spectroscopy, field emission scanning electron microscopy and high-resolution transmission electron microscopy. The...
We present the successful design and synthesis of few-layer graphenes over an Au/MgO catalytic system by chemical vapor deposition with methane as the carbon source. The resulting structures were composed of a few graphitic layers, and the highest synthesis yield was found to be 62% when the methane flow rate was 120mL/min. The dimension of the in-plane crystallites was found to increase with the...
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