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Three-dimensional (3D) carbonaceous aerogels assembled by one-dimensional (1D) carbon nanofibers (CNF) have attracted much attention, because their unique interconnected and hierarchical porous structure can offer a wide range of applications in environmental remediation and energy storage. Herein, the residue of gelidium amansii (mainly endofibers, ∼1.6 μm) after extraction of agar were used as precursor...
A three-dimensional graphene-based nanostructure with graphene aerogel templating graphene nanosheets (GA-GNs) has been fabricated via a modified hydrothermal method, followed by a microwave plasma chemical vapor deposition process. The mechanical properties of such hybrid nanostructures, for the first time, were quantitatively measured to demonstrate their superior mechanical robustness with stress...
A simple preparation procedure to produce conductive graphene coatings from graphenide solution under inert atmosphere is achieved. The obtained graphene films exhibit reasonably low surface resistivity of 5 kohms/Square at 60% transmittance at 550 nm that can be largely improved by thermal treatment. XPS, Raman spectroscopy and X-ray diffraction measurements demonstrate that annealing vastly improves...
A remarkable synergetic effect between the graphene (GR) and carbon nanotube (CNT) in improving the interfacial mechanical properties of polyethylene polymer composites was investigated using molecular dynamics simulations. The reinforcement effects of two types of hybrid GR-CNT were evaluated. For the π−π stack hybrid GR-CNT, the alignment of CNT has a slight effect on the interfacial mechanical...
Graphene-based flakes of various origins were investigated by transmission electron microscopy. For each of them, the morphotype was described, and then both the related structure (stacking type) and nanotexture (degree of perfection of the graphene layers) were described as well. Two kinds of clearly discriminated morphotypes were found (‘crumpled’ and ‘folded’), for objects with similar overall...
The development of low-cost, highly efficient carbon-based photocatalysts becomes a hot trend due to their special structures and unique electronic properties in the field of photocatalysis. Here, a novel 2D/2D carbon-based nanocomposite was constructed via mutual supporting strategy by using poly-(furfural alcohol) and melamine as the precursors. The introduction of carbonized poly-(furfural alcohol)...
Fast growing power densities of modern electronic devices demand high-performance thermal interface materials (TIMs). Owing to the superior thermal conductivity of graphene, composites with graphene fillers dispersed in polymer matrix are expected to be promising TIM candidates. However, the thermal conductivity of graphene-polymer composites is hindered by a high thermal resistance across the interface...
Both regular and defective onion-like carbon (OLC) nanoparticles were prepared by the arc-discharge process using hexane (C6H14) and ethanol (C2H5OH) as carbon sources. The formation of defective sites in OLC nanoparticles is ascribed to the introduction of oxygen of ethanol. It is shown that high vacuum or using raw materials without oxygen is favorable to form regular onion-like microstructure....
Carbon fiber-reinforced carbon composites (C/C), carbon fiber reinforced-carbon and silicon carbide binary matrix composites (C/C–SiC) and carbon fiber reinforced carbon–silicon–zirconium–oxygen matrix composites (C/C–Si–Zr–O) were prepared through a combination of chemical vapor infiltration (CVI) and polymer impregnation pyrolysis. The microscopic morphology, phase structure, mechanical properties...
Large size and high quality graphene grown by chemical vapour deposition (CVD) has been fabricated into an array of discrete graphene sheets with well-defined sizes and shapes. A fabrication process based on nanoimprint lithography has been developed to achieve shape tunability with sizes ranging from micrometer to nanometer. The technique preserves the quality of the CVD grown graphene and offers...
Aggregation and restacking of graphene nanosheets (GNS) can be efficiently inhibited by decorating the silver nanoparticles on the surface of GNS to form GNS/silver (GNS-Ag) composites, which can construct high transparent and electrically conductive thin films. Silver nanoparticles act as a useful nanospacer and conductor, which not only increase the interlayer distance but also improve the electrical...
A remarkable synergetic effect between the multi-graphene platelets (MGPs) and multi-walled carbon nanotubes (MWCNTs) in improving the mechanical properties and thermal conductivity of epoxy composites is demonstrated. Stacking of individual two-dimensional MGPs is effectively inhibited by introducing one-dimensional MWCNTs. Long and tortuous MWCNTs can bridge adjacent MGPs and inhibit their aggregation,...
The pyrolysis of iron(II) phthalocyanine on an Au substrate under an atmosphere of ethanol/argon was found to produce recumbent bamboo-like multi-walled carbon nanotubes. By changing the pattern of the Au bars in the substrate, the configuration of the nanotube could be changed. A possible mechanism for the formation of these patterns is suggested.
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