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Highly uniform and crystalline ultradisperse Pt nanoparticles with average sizes of 2.4nm were deposited on oxygen-free few-layer graphene (FLG) by polyol reduction method without any additional protective agents. The samples were analyzed by Raman spectroscopy, photoelectron spectroscopy using synchrotron radiation and high-resolution transmission electron microscopy. The experiments showed that...
As an alternative to potentially carcinogenic hydrazine for fuel cell application, carbohydrazide, which contains lone electron pairs on nitrogen atoms and readily activated N–H bonds, can be catalytically oxidized over metal-free carbon catalysts due to the high equilibrium electromotive force (1.65V) of its oxidation reaction. Carbon nanotubes are found to electrochemically catalyze the carbohydrazide...
Rattle-type magnetic carbon nanospheres were obtained easily by annealing core–shell–shell hybrid nanospheres. The nanospheres were fabricated by combining, in a single step, a tetraethyl orthosilicate sol–gel process and the condensation polymerization of resorcinol and formaldehyde in the presence of ammonia. Subsequent annealing and silicon dioxide removal in sodium hydroxide solution resulted...
Carbon-encapsulated Co3O4 nanoparticles homogeneously embedded 2D (two-dimensional) porous graphitic carbon (PGC) nanosheets were prepared by a facile and scalable synthesis method. With assistance of sodium chloride, the Co3O4 nanoparticles (10–20nm) with magnetic loss were well encapsulated by onion-like carbon shells homogeneously embedded porous graphitic carbon nanosheets (thickness of less than...
Density functional theory calculations were used to study the structural, electronic, and magnetic properties of double-side partially fluorinated graphene. Both even and uneven fluorinated structures examined. It is found that midgap states and magnetic moments only appear in the uneven double-side fluorinated graphene. The magnetic moments mainly come from the carbon atoms at the edge of the fluorinated...
We report a systematic study on charge transport properties of thermally reduced graphene oxide (rGO) layers, from room temperature to 2K and in presence of magnetic fields up to 7T. The most conductive rGO sheets follow different transport regimes: at room temperature they show an Arrhenius-like behavior. At lower temperature they exhibits a thermally activated behavior with resistance R following...
Design and fabrication of functional carbon nanostructures is a challenging but meaningful mission for scientists to propel the development of nanotechnology, such as nanopharmacology, nanobiology and nanofluidic manipulation. In order to fabricate the carbon nanostructures, using forced-field-based molecular dynamics simulations, we proposed a feasible method to obtain the carbon nanostructures through...
In this study, a high-performance graphene-based nacre was prepared using gelatin as a bioadhesive with the aid of the bending cycle-induced “mechanical annealed” effect. By this method, this type of graphene-based nacre is endowed with high strength, toughness, and electrical conductive properties, which is very different from other study where only one or two of three properties were improved. The...
Using full-band electron and phonon dispersion relations, we investigate the temperature dependence of Joule heating in Zigzag Graphene Nanoribbons under high electrical field. The Joule heating at different temperatures always increases linearly with time, therefore the Joule heating power is a constant. Because more scattering mechanisms are available for electrons in Zigzag Graphene Nanoribbon,...
High quality flower-like NiCo2O4 has been fabricated on three-dimensional (3D) graphene foam (GF) and used as an electrode for supercapacitors. The 3D GFs are prepared through chemical vapor deposition (CVD) followed by the electro-deposition of flower-like NiCo2O4. The NiCo2O4/3D GF nanohybrids are characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron...
Carbon nanocoils (CNCs) with different shapes and coil diameters have been synthesized on three kinds of substrates made of plant fibers, i.e. tissue, cotton cloth and bamboo fiber cloth, using Fe2 (SO4)3/SnCl2 catalyst by a thermal chemical vapor deposition method. The average coil diameters of the CNCs on the tissue, cotton cloth and bamboo fiber cloth substrates are 560, 183, and 510nm, respectively...
In this paper, we present a simple solution to a major technological issue, the extraction of gallium from bauxite ore and aluminium–gallium separation. Due to its extremely large surface area and oxygen functional groups, graphite oxide was used for the highly selective sorption of Ga3+ from Al3+/Ga3+ mixtures. Graphite oxide prepared according to the Hummers method has various oxygen functionalities...
A versatile graphene coated glass microswimmer displayed directed motions under the influence of applied electric field, chemical potential gradient and external magnetic field. The directed chemical locomotion took place from the region of lower to higher pH with speed ∼13 body lengths per second due to asymmetric catalytic decomposition of dilute hydrogen peroxide across the motor surface. The negative...
Electrochemical quartz crystal microbalance was used to monitor the mass changes during the electrochemical characterization of a zeolite-templated carbon (ZTC) in 1M H2SO4 medium. Under electrochemical oxidation conditions, a high anodic current and a net mass increase were recorded, resulting in the increase of the specific capacitance owing to the contribution of the pseudocapacitance, mainly derived...
Development of cheap, green and up scalable production methods for graphene is one of the most challenging problems in its manufacture on an industrial scale. We report here a large scale substrate-free fluidized bed catalytic chemical vapour deposition (FB-CCVD) process for few layer graphene (FLG) powder production that uses a crystalline oxide catalyst of the general formula AxB3−xO4, wherein the...
The elastic properties of graphene as described by the reactive empirical bond order potential are studied through uniaxial tensile tests calculations at both zero temperature, with a conjugate gradient approach, and room temperature, with molecular dynamics simulations. A perfect linear elastic behavior is observed at 0K up to ≈0.1% strain. The Young’s modulus and Poisson’s ratio obtained with this...
Polyviologen (PV)–reduced graphene oxide (rGO) nanocomposite films were fabricated by simple, one-step reductive electropolymerization of cyanopyridinium based precursor monomer (CNP) in an aqueous dispersion of graphene oxide (GO). Since the polymer formation and reduction of graphene oxide occurs within the same potential window, electrocodeposition method was preferred for obtaining nanostructured...
To realize maskless functionalization of a carbon nanotubes (CNTs) dot array, a localized surface functionalization technology using an ultrafine atmospheric pressure plasma jet was developed. The plasma surface functionalization onto vertically aligned CNTs was carried out in two stages: pretreatment for activation of the CNT surface and posttreatment for surface functionalization. The experimental...
The performance of dielectric electroactive polymer (D-EAP) based actuators depends critically on the electrode characteristics. Among the most challenging issues in the application of D-EAPs is the device-level complexity in producing sufficient directional actuation at acceptably low electric fields. In this work, a simple carbon nanotube (CNT) based electrode for D-EAP actuators is demonstrated...
Herein, we report a facile method to significantly enhance the dielectric performance of reduced graphene oxide-based polymer composites. Addition of thionyl chloride into graphene oxide (GO) dispersion induces synergistic modifications of the structure, chemistry, charge carrier density and electrical conductivity of GO, as well as the interfacial interaction and phase of the surrounding matrix in...
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