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All carbon-electrode is ideal for supercapacitor, but synthesizing macro-level >3 GPa strong porous carbon electrode is challenging. Here, we presented an approach of synthesizing robust flexible “carbon-concrete” films integrating carbon fibers, graphene and hierarchical porous activated carbon. The method involved electrochemically spreading of carbon fiber bundles and in-situ activation of cellulose...
In this research, hydroxylated and carboxylated graphene (GROH and GRCOOH) with controllable functionalized level by means of diazonium addition was successfully prepared, and the dielectric properties of polyvinylidene fluoride (PVDF) composites fabricated via a simple solution-cast and hot-pressing method are examined. Tunable dielectric properties, low percolation threshold (0.20 wt%) and large...
Carbon nano-onions (CNOs) are emerging carbon nanomaterials with unique microstructure and electronic properties. CNOs are 0-D carbon analogs of 1-D carbon nanotubes (CNTs) and 2-D graphenes. CNOs are composed of sp2-bonded, concentric nanographene shells surrounding a hollow core. Microstructure, electrochemical properties, and biosensing performances of nanodiamond-derived CNOs (N–CNOs) were studied...
Photoluminescent carbon dots (C-dots) were prepared directly by a simple hydrothermal treatment using polyethylene glycol with different molar weight (400–6000gmol −1 ) as the sole carbon source. The synthesized C-dots with tunable diameters of 2–4nm exhibit excitation-dependent photoluminescent behavior. In contrast to previous methods, neither strong acid treatment nor further surface modification...
Using a random polymerization process on graphene oxide (GO), graphene oxide grafted with oligomers containing phosphorylcholine moieties (GO-PCn) was synthesized. The synthesis products were characterized by atomic force microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and X-ray diffraction. The results revealed...
An epitaxial TiC/nanodiamond (ND) was used as novel support for Pt electrocatalysts to improve its durability in fuel cells. The TiC/ND was fabricated by a simple one-pot synthesis method. TiC/ND-supported Pt electrocatalysts were synthesized using a microwave-assisted ethylene glycol method. Pt nanoparticles (NPs) with a mean size of 4.4nm were highly dispersed on the TiC/ND’s surface. The Pt/TiC/ND...
An easy approach was reported to synthesize graphene nanosheets attached to spiky MnO 2 nanospheres (GS/MnO 2 ) which showed good catalytic activity, electrical conductivity, solubility and processability. The synthetic method was efficient, green and controllable with graphene oxide reduced and MnO 2 nanospheres formed in one step. The obtained material was further characterized...
The fabrication and functionality of a 21cm graphene-based transverse electron emission display panel is presented. A screen-printed triode edge electron emission geometry has been developed based on chemical vapor deposited (CVD) graphene supported on vertically aligned carbon nanotubes (CNT) necessary to minimize electrostatic shielding induced by the proximal bulk substrate. Integrated ZnO tetrapod...
Hafnium carbide (HfC) modified carbon/carbon (HfC-C/C) composites were prepared by impregnating carbon felts with a saturated HfOCl 2 ·8H 2 O ethanol solution and heat treating at 600°C to form HfO 2 /C composites that were then densified with pyrocarbon by chemical vapor infiltration and graphitized at 2100°C to convert HfO 2 into HfC. The HfC-C/C composites as rocket...
Long, oriented vapor-grown carbon fibers with high purity were synthesized from coal pitch by chemical vapor deposition using ferrocene as catalyst precursor and hydrogen as carrier gas. Field emission scanning electron microscopy, energy dispersive spectroscopy, high resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy and thermalgravimetric analysis were employed to...
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