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Modulus distribution in carbon fiber (CF) monofilament plays a key role in bridging the microscopic heterogeneous structures to the macroscopic mechanical properties, and is critical to understand its performance. Here, we present a quantitative measurement of the modulus distributions for a series of commercially available polyacrylonitrile (PAN)-based CFs (T300, T700S, T800H, T1000G and M40J from...
Abundant and low-cost materials with high electrochemical catalytic activity for oxygen reduction reaction (ORR) are in urgent demand for energy storage and conversion devices. In this work, an advanced ORR electrocatalyst of Pt-decorated three dimensional (3D) N-doped carbon porous microspherical cavity (PtN/C PMC) was fabricated by using polystyrene microspheres (PS) as template, and dopamine and...
Interlayer carrier scattering hampers electrical conduction in two-dimensional layered nanostructures. Extenuated carrier scattering is observed in a double-layered graphene system with hexagonal boron nitride (h-BN) as an interposer. Raman spectrum shows signature peaks with enhanced sharpness as compared with that of bilayer graphene. The density functional theory simulation shows degenerate energy...
We reported a novel low-cost CVD system for repeatable graphene deposition with “no” precursor. Isoprene, emission from natural rubber, was the continuous carbon source for newly designed CVD graphene system. Because of longer carbon chain and lower decomposing energy, higher efficient growth process for continuous graphene film was repeatedly achieved for more than 50 times. Characterizing tools...
Phosphorus-doped nanomesh graphene (PG) with huge specific surface area and lamellar hexagonal structure has been synthesized by a thermal annealing method using MgO as a template and triphenylphosphine (TPP) as both phosphorus and carbon source. The synthesized PG with a high phosphorous content of 1.61 at% is found to exhibit efficient metal-free heterogeneous catalytic activity for aerobic oxidative...
We present a feasible method, named as radius profiling, to study the structure–mechanical heterogeneity of polyacrylonitrile (PAN)-based carbon fibers (CFs). CF monofilaments were peeled layer by layer by plasma etching, and their electrical resistances and mechanical properties were measured by a multimeter and a single-filament tensile tester, respectively. The method allows the structure and mechanical...
The thermal conductivities of the newly synthesized all-sp2 three-dimensional graphene are investigated by equilibrium molecular dynamics simulations in this work. It is found that the thermal conductivity parallel to the honeycomb axis direction (kz) is one order magnitude higher than that perpendicular direction (kxy). This anisotropy is explained by the direction-dependent effective elastic constants...
Hollow carbon nanospheres (HCNs) with tunable sizes have been successfully prepared by the calcination of hollow copolymer nanospheres. Our findings indicate that compared to the counterpart solid carbon particle, HCNs all achieve substantially enhanced microwave absorption, suggesting that hollow structure plays an important role during microwave absorption. Moreover, further investigation on the...
Exploiting cost-effectiveness and highly efficient counter electrodes (CEs) has been a persistent objective for large-scale practical application of dye-sensitized solar cells (DSSCs). Here, we propose an alternative design for the fabrication of low-cost and Pt-free CE materials by constructing fast electron transport network and creating highly active sites on the electron pathway using graphene...
A facile method is developed to synthesize a fiber-like reduced graphene oxided (rGO)/molybdenum disulfide (MoS2) composites through a wet-spinning and a hydrothermal method. In the presence of Dodecyl dimethyl benzyl ammonium chloride, graphene provides a substrate for nucleation of MoS2. In this composite, MoS2 nanosheets can be anchored onto the surface of graphene through both physical adsorption...
We report that graphene films with thickness ranging from 1 to 7 layers can be controllably synthesized on the surface of polycrystalline copper by a chemical vapour deposition method. The number of layers of graphene is controlled precisely by regulating the flow ratio of CH 4 and H 2 , the reaction pressure, the temperature and the reaction time. The synthesized graphene films were...
Single- and double-walled carbon nanotubes (SWCNTs and DWCNTs) have been controllably synthesized by an arc discharge in different atmosphere using petroleum coke as carbon source. The morphology and properties of two kinds of carbon nanotubes (CNTs) synthesized with Fe as catalyst were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy,...
Connecting straight carbon nanotube (CNT) arms with different CNT junctions, 2D CNT covalent networks can be theoretically constructed. The equivalent material properties of two kinds of 2D CNT network, the super square and super hexagon, are compared using molecular structure mechanics. Under uniaxial tensile loading in the principle direction, the super square could be regarded as a stretching-dominated...
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