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Pt–Sn/graphene catalysts were prepared by heat treatment of a dispersion of graphene oxide, SnCl2 and H2PtCl6 in ethylene glycol at 130°C for 3h after its pH value had been adjusted to 12 by NaOH, followed by centrifuging, washing with ethanol and water, and cryodrying. The pH value of the heat-treated dispersion was controlled by adding dilute nitric acid to 2, 4 and 6 to mediate the properties of...
A simple process to synthesize three-dimensional molybdenum disulfide-graphene monolithic catalysts (3D-MoS2-G) was developed. 3D-MoS2-G hybrid monoliths were fabricated by a combined hydrothermal self-assembly and freeze-drying treatment, in which ammonium tetrathiomolybdate and graphite oxide were used as starting materials. The structure and morphology of the samples were characterized by X-ray...
The field emission (FE) properties of vertically aligned carbon nanotube (CNT) arrays having a surface decorated with Ta layer were investigated. The CNTs with 6nm thickness of Ta decoration showed improved FE properties with a low turn-on field of 0.64V/μm at 10μA/cm 2 , a threshold field of 1.06V/μm at 1mA/cm 2 and a maximum current density of 7.61mA/cm 2 at 1.6V/μm. After...
Carbon nanotubes (CNTs) were synthesized on carbon fibers by a modified thermal chemical vapor deposition (CVD) method. The fibers were first treated at a temperature of 973K and then treated by a mixture of sulfur acid and nitric acid with a volume ratio of 1:3 to improve the dispersion of catalyst precursor (Fe (NO 3 ) 3 ·9H 2 O) on the surface before impregnation with a...
Graphene oxide films were prepared by the modified Hummers method, which includes sonication, aggregation and self-assembly. The graphene films were obtained by vacuum heat treatment of the graphene oxide films. XRD, SEM, FTIR and Raman spectroscopy were used to investigate the microstructure evolution of the films during preparation. It is found that self-assembly is a simple method to produce graphene...
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