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We investigate the dephasing effect and atomic doping effect of random substitutional boron (B) or nitrogen (N) on the valley Seebeck effect in zigzag graphene nanoribbons (ZGNRs) using the tight-binding model calculations. When thermal gradient applied in the device made of ZGNRs is around several hundreds K, dephasing effect can only reduce the magnitude of pure valley current without generating...
The wetting and bonding behaviors between electrode nano-metals and carbon materials play an important role in dissimilar joining and solidification especially for graphene/carbon nanotube (CNT) based nano-devices. As an important indicator, the contact angle between them can provide explicit information for the understanding of their interfacial interactions. However, the conventional sessile drop...
SiC-assisted growth of tubular graphenic cones (TGCs) with carbon nanotube tip is achieved with high yield in the microwave plasma chemical vapor deposition process. No pre-existing metal or semiconductor catalyst particles are required on the substrate prior to the deposition process. Instead, the in situ grown SiC crystallites serve as the catalyst for the growth of TGCs. Thanks to the easy formation...
Coexistence of nonvolatile and volatile resistive switching behaviors was demonstrated in Cu/amorphous carbon/Pt sandwich-structure memory devices by adjusting compliance currents (CCs) to control the size of Cu conductive filament (CF). It was observed that the retention time of the volatile switching strongly depends on the CF’s size, and can be tuned in a wide range from hundreds of milliseconds...
Montmorillonite-modified carbon foams with a closed-pore structure were prepared by compressive molding of phenolic resin, phenolic hollow microspheres and montmorillonite, followed by thermosetting and carbonization at 800°C under Ar flow. The effects of the montmorillonite content on the microstructure, compressive strength and thermal conductivity of the modified foams were investigated. Results...
In this paper, the reduced graphene oxide (rGO) is synthesized from graphite oxide (GO) via microwave exfoliation method, and used to support non-noble metal Fe–NX based electrocatalysts (Fe–NX/rGO) for the oxygen reduction reaction (ORR). Tripyridyl triazine (TPTZ) is used as a ligand for Fe–NX catalyst preparation. The obtained catalyst presents a high content of pyridinic (N1) and pyrrolic (N2)...
Vertically-aligned carbon nanotube (VACNT) composite membranes were fabricated by impregnating carbon nanotube (CNT) forests with poly-para-xylylene (parylene-C) through room-temperature chemical vapor deposition (CVD). Transport properties of diverse gases through the CNT/parylene membranes were investigated. The gas permeances scaled inversely with their molecular weights in accordance with Knudsen...
Friction tests on two surfaces of highly oriented pyrolytic graphite that are parallel and perpendicular to the direction of the graphite basal plane were performed under various test conditions. The average friction coefficient value of the perpendicular surface (0.25) is higher than that of the parallel surface (0.1). The friction coefficient of both parallel and perpendicular surfaces decline when...
Vertically-aligned carbon nanotube (CNT) forests were modified using radio-frequency Ar/O 2 plasma. The effect of plasma parameters on surface morphology, atomic composition and structure of CNT forests were studied. Functionalized CNT forests preserved vertical alignment and showed dramatic change in surface morphology, and bundle-like patterns were observed from scanning electron microscopy...
Based on armchair carbon nanotubes (CNTs), we construct the structural models of symmetric armchair carbon nanotori of different tubular/radial diameters. Tight-binding (TB) calculations show that the energetic stabilities of these carbon nanotori rely on their symmetries and tubular diameters closely. Density functional theory (DFT) calculations on a carbon nanotorus with substitutional B/N doping...
Ablation of needled carbon/carbon (C/C) composite nozzle-throats was studied by hot-fire testing in a small solid rocket motor. The composition of the combustion gases was estimated by principle of free energy minimum. The ablation morphology was investigated by scanning electron microscopy. The ablation mechanism of C/C composites was also studied. The results showed that the ablation performance...
Sandwiched film of MnO 2 nanosheet (MONS) and multi-walled carbon nanotube (MWCNT) was assembled by using the layer-by-layer method, based on electrostatic interaction of positively-charged poly (diallyl dimethyl ammonium chloride) and negatively-charged MONS and MWCNT. Ultraviolet–visible spectroscopy is used to probe the dynamic growth of multilayer film, exhibiting progressive enhancement...
The reactivity of O-, T- and R-phases of the high pressure–high temperature (HPHT) polymerized C 60 towards gaseous fluorine in the temperature range of 50–250°C was investigated. The reaction products were characterized by FTIR, powder X-ray diffraction, SEM, EDX, and VTP-EIMS to determine the bulk stoichiometries, bonding patterns, phase compositions, crystalline structures and thermal decomposition...
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