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Relative high filling ratio and poor reflection loss performance in low frequency are two major challenges in promoting microwave response of current carbon material which could be overcome by rational structure engineering. Herein, hollow graphite spheres embedded in porous amorphous carbon matrix has been prepared by etching Fe3Ni/C composites derived from Fe2Ni MIL-88 nanorods. Construction of...
A novel idea has been developed to realize the formation of heteroatoms doped carbon materials by exploiting a precursor of a single compound, polyphosphazene, for supercapacitor applications. Heteroatoms (N, P, O) containing polymer, poly(diaryloxyphosphazene) (PDPP) was synthesized by the substitution reaction of linear polydichlorophosphazene (PDCP) with sodium phenolate. After carbonization of...
Two-dimensional reduced graphene oxides (RGO) decorated with well-dispersed Ni nanoparticles were facilely fabricated via low temperature annealing of Ni(OH)2/Graphene composites in flowing H2. Ni@Graphene core-shell nanostructures were obtained following a self-catalyzed growth mechanism. The kinetic epitaxial growth of RGO layers on Ni(111) facets originates from annealing-driving phase transition...
Porous carbon nanotubes (PCNTs) containing sulfur were successfully fabricated through a simple approach, which is the simultaneous activation and carbonization of sulfonated polydivinylbenzene nanotubes with KOH. The PCNTs take on hierarchical porous structure composed of well interconnected mesopores and numerous micropores. Chemical analysis shows that the PCNTs contain sulfide and sulfone groups...
Predictive modeling and understanding of binding of organic molecule-decorated graphene is an essential prerequisite for tuning their electronic and magnetic properties. Many-body dispersion (MBD) interactions are known to contribute significantly to the binding of condensed matters, but the role of MBD energy in self-assembled organic monolayers on epitaxial graphene remains largely unexplored. Here,...
Hierarchically stacked 2D graphene oxide (GO) membranes are a fascinating and promising new class of materials with the potential for radically improved water vapor/gas separation with excellent selectivity and high permeability. This paper details dehumidification results from flowing gas mixtures through free-standing GO membrane samples prepared by a casting method. The first demonstrated use of...
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....
A simple method for processing high-performance carbon nanotube (CNT)/poly(vinyl alcohol) (PVA) composites by coupling the spraying of a PVA solution with the continuous winding of CNT sheets from an array onto a rotating mandrel is reported. This method allows the CNT composites to have a high CNT volume fraction, while having a high degree of alignment, long CNTs, and good integration with the matrix,...
The mechanisms determining the growth of high-quality monolayer and bilayer graphene on Cu using chemical vapor deposition (CVD) were investigated. It is shown that graphene growth on Cu is not only determined by the process parameters during growth, but also substantially influenced by the quality of Cu substrate and how the Cu substrate is pretreated. It is found that the micro-topography of the...
Thin-wall carbon nanocages with a variety of shapes were prepared by pulsed-laser ablation (PLA) of a carbon black target in water without the use of any catalysts. The experimental results suggested that they were formed by a bubble blowing mechanism rather than by the condensation of a gas, cluster or liquid.
WC/carbon composites (WCCs) with high specific surface area were synthesized by the direct carbonization of a mixture of hydroxylpropyl cellulose, polyvinyl alcohol, K 2 WO 4 and K 2 CO 3 at 900°C in flowing N 2 . The resultant material was characterized using X-ray diffraction, thermogravimetric analysis, nitrogen sorption and scanning electron microscopy....
Carbon nanobelts, highly branched carbon nanotubes (CNTs) and carbon nanorods (CNRs) were synthesized by the catalytic pyrolysis of acetylene using Fe-catalyst at different temperatures. The 3D double branched K junction and various 2D single branched Y, L, T junctions on CNTs and CNRs were characterized by SEM, TEM, and Raman spectroscopy. The bamboo shaped hollow interior of the K junction indicated...
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