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Recently, broad spectral response phototransistors have drawn substantial attention due to their applications in the field of industry and science. However, it is difficult to synthesize appropriate photosensitive materials, which greatly limits their development. Integrating multicomponent bulk heterojunctions with high mobility materials to form hybrid planar-bulk heterojunction is a very effective...
Nitrogen-doped (N-doped) porous carbon nanofiber webs (CNFWs) have been successfully prepared via one-step carbonization-activation treatment of pre-synthesized polypyrrole (PPy) nanofiber webs (NFWs). In this preparation process, the carbonization of the precursor and further activation with KOH were completed simultaneously. We detailedly investigated the effect of different activation conditions...
As a promising visible-light photocatalyst, BiVO4 is widely used for degradation of organic pollutants, selective synthesis of organics and O2 production from water. Morphology design and coupling with graphene are effective methods to enhance its photocatalytic efficiency. Herein, a novel hydrothermal method was developed for the fabrication of BiVO4 nanoplates with exposed {010} facets onto reduced...
Carbonaceous materials such as activated carbon (AC) are effective adsorbents for a number of organic contaminants, and are often used in soil and sediment remediation to sequester organic contaminants. However, little is known about the abiotic reactivity (and thus, the long-term fate) of the carbonaceous material-bound contaminants. We studied the base-promoted dehydrochlorination kinetics of low-level...
A polymer pyrolysis chemical vapor deposition (CVD) route has been established to synthesize homogeneously dispersed carbon nanotubes (CNTs) in Al nanoflakes within a closed batch reactor, with polyethylene glycol (PEG) and cobalt nitrate as precursors of carbon and catalyst, respectively. A parametric study is conducted to control the CNT growth by optimizing parameters such as synthesis temperature,...
A simple approach was developed for the fabrication of a Fe 2 O 3 /carbon composite by impregnating activated carbon with a ferric nitrate solution and calcinating it. The composite contains graphitic layers and 10wt.% Fe 2 O 3 particles of 20–50nm in diameter. The composite has a high specific surface area of ∼828m 2 g −1 and when used as the anode...
A double-sided surface light source based on field emission (FE) using an alternating current power source is demonstrated. Carbon-nanotube (CNT) emitters and ZnS phosphor are mixed and screen-printed onto two pieces of indium tin oxide glass that were assembled together with the coated surfaces facing each other to make a parallel-plate, diode-structure FE device. The device has a double-sided luminance...
Thin-walled carbon nanotubes (TWCNTs) were synthesized using a zirconium (Zr) plate by cold-wall chemical vapor deposition of a mixture gas consisting of C 2 H 2 and H 2 under a pressure of 1.20torr. The Zr plate was used for the formation of Zr nanocatalysts during the thermal process and used as substrate to eliminate the effects of interactions between catalyst and substrate...
Turbostratic carbon nanofibers (CNFs), platelet graphite nanofibers (PGNFs) and tubular graphite nanofibers (TGNFs, also called multi-walled carbon nanotubes) were synthesized using thermal decomposition from a mixture of poly(ethylene glycol) and NiCl 2 . A detailed study found that the synthesis temperature dramatically affected the morphology and topography of the catalysts, which play...
The fabrication of carbon nanocapsules and carbon nanotubes (CNTs) using an acetylene flame method was investigated. Carbon nanocapsules, a graphitic structure of nanoparticles with a hollow core, were synthesized using catalyst-free acetylene flames while CNTs were formed with the presence of cobalt-based catalysts in addition to acetylene flames. When the synthesis of these materials was carried...
Multiwalled carbon nanotubes (MWNTs) were synthesized using a chemical vapor deposition floating feed method in a vertical reactor. Effects of the preparation variables on the average diameter of carbon nanotubes were systematically examined using the fractional factorial design (FFD), path of the steepest ascent, and central composite design (CCD) coupled with the response surface methodology. From...
The aim of this study is to investigate the possibility of using a polymer material, polyvinyl alcohol (PVA), as an additional carbon source to fabricate carbon nanotubes using arc-discharge method. Experiments were carried out using a graphite anode filled with a mixture of PVA and iron group catalysts. The results indicated that PVA material not only can be used for the formation of carbon nanotubes...
The objective of this research was to investigate the feasibility of activating vapor-grown carbon fibers (VGCFs) with supercritical fluids (SCFs). VGCFs with a mean diameter of 150 nm and a length of a few micrometres were treated using water or carbon dioxide under supercritical conditions for 10 min. Hydrochloric acid and nitric acid were utilized for the oxidation of the VGCFs prior to the treatment...
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