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The in-plane thermal conductivity (kSiG) of silicon-doped graphene (SiG) was greatly suppressed primarily due to increased phonon scattering associated with the large mass difference of Si from its host C atoms. For SiG as supported on an 8 nm-thick SiO2 substrate, the measured kSiG represents progressive decrease and saturation with the increase of Si dopants concentration, showing more than an order-of-magnitude...
Herein, we engineered a self-electrical stimulated double-layered nerve guidance conduit (NGC) assembled from electrospun mats with an aligned oriented inward layer covered with a random oriented outer layer. The biomimetic NGC can be achieved from chitosan grafted polyurethane with well-dispersed functionalized multiwall carbon nanotubes (fMWCNTs) nanofibrous mats after a uniform coating of polypyrrole...
We investigate the application of the onion-like carbon (OLC) as an electrocatalyst for [VO]2+/[VO2]+ redox flow reaction; its performance (electrocatalytic activity and reversibility) strongly increases with the synthesis to peak at 1800 °C in 1000–2000 °C range. The dopant/modification-free, optimized redox performances of the OLC is comparable to some of the best data in the literature of various...
Measuring the thermal conductivity kg of supported graphene is inherently complicated due to uncertainties associated with the heat dissipation into the substrate. We innovate the use of an ultra-thin 8-nm SiO2 substrate to alleviate these uncertainties and thus improve the accuracy of optothermal Raman technique to measure kg of supported graphene. As a result, we present an extensive kg database...
The optimal design of air-electrodes is one of the important keys to achieve the high rechargeability of Li-O2 batteries, however, remains as a challenging issue to date. Herein, we propose an air-electrode architecture based on three-dimensionally open macroporous carbon nanowebs (3-DOM-CNWs), which can be easily scaled-up maintaining its hierarchical structure of nano/micrometer-scale pores. It...
Graphene-based nanofiltration membranes with different degrees of oxidation were produced using a novel aqueous arc discharge process for water purification applications. By adjusting the current level during the arc discharge the degree of oxidation was controlled from 28.1% at 1 A (Gr1A) to 53.9% at 4 A (Gr4A). Over 70% of the resulting graphene sheets had less than 10 layers. The effect of the...
Linear carbon chains (LCCs) consisting of sp-hybridized carbon atoms are considered a fascinating 1D system and could be used in the fabrication of the next-generation molecular devices because of its ideal linear atomic nature. A large portion of long LCCs inside multi-walled carbon nanotubes (MWCNTs) were synthesized by atmospheric arc discharge in the presence of boron. Closed-end growth of MWCNTs...
Carbon dot-Au nanoraspberries (Cdot-Au NRs) were synthesized by a simple one-pot process using Cdots as initiators to direct the dendritic growth of Au via room temperature chemical reduction of HAuCl4 by formic acid. We evaluated the resulting Cdot-Au NR as a counter electrode material for ZnO nanowire/CdS/CdSe quantum dot-sensitized solar cells (QDSCs). The counter electrode employing Cdot-Au NRs...
The synthesis and electrochemical performance of a composite of Co9S8 nanoparticles and amorphous carbon is studied as an anode material for sodium-ion batteries. The Co9S8–carbon composite powder was fabricated through a one-pot spray pyrolysis process using thiourea and polyvinylpyrrolidone as sulfur and carbon sources, respectively. The Co9S8 nanoparticles are entirely covered by an amorphous carbon...
Carbon films and coatings are industrially very versatile and have a multiplicity of applications, such as conductive coatings or chemical and thermal protection layers. However, in most cases they are fabricated by the expensive vapor process, which has prevented a wider commercialization of these products. Herein, carbon films are fabricated using an inexpensive polymer-solution-based or sol–gel...
The interaction between a graphene edge and the underlying metal is investigated through the use of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations and found to influence the geometrical structure of the graphene edge and its electronic properties. STM study reveals that graphene nanoislands grow on a Pt(111) surface with the considerable bending of the graphene...
We report the simple production of highly uniform single-walled carbon nanotube (SWCNT) thin films with significant reduction of the conducting material consumption by applying an effective microliter-scale solution process. The transparent thin film conductors were formed directly on a rigid or flexible substrate within a short process time by dragging a meniscus of an aqueous SWCNT solution with...
Escherichia coli is the predominant pathogen in catheter-associated urinary tract infection (CAUTI) and cystitis. CAUTI treated with prophylactic antibiotics induces antibiotic resistance in hospitals and nursing homes. Therefore, we developed a physical method to treat cystitis by using activated carbon (AC) fibers to remove lipopolysaccharide (LPS) from the bladder. An in vitro assay showed that...
Acrolein (ACR) is a metabolite of cyclophosphamide (CYP) and induces hemorrhagic cystitis (HC). Here, we investigated the effectiveness of ZnO/carbon fiber (CF) composites as catalysts for removing ACR through photodegradation. Specimens composed of CF and zinc oxide (ZnO) were prepared and annealed at 200–400°C in air. For the ZnO/CF specimen annealed at 200°C (CZ200), a continuous and porous ZnO...
An aqueous conductive ink of multi-walled carbon nanotubes (MWCNTs) for inkjet printing was formulated. To prepare the homogeneous MWCNT ink in a size small enough not to block a commercial inkjet printer nozzle, we used a kinetic ball-milling process to disperse the MWCNTs in an aqueous suspension with naphthyl-group-based non-ionic surfactants. When a patterned electrode was overlaid by repeated...
Contemporary characterisation techniques for graphenes are often performed for samples in a dried state or vacuum, which can lead to significant structural changes and difficulty in assessing the actual physical or physicochemical characteristics of graphenes in a colloid state. The interfacial phenomena between water or mixtures (of water with benzene, methane, or HCl) bound to single-layer graphene...
We have explored the condensation behavior of water on a superhydrophobic carbon fiber (CF) network with high-aspect-ratio hair-like nanostructures. Nanostructures ranging from nanopillars to hairy shapes were grown on CFs by preferential oxygen plasma etching. Superhydrophobic CF surfaces were achieved by application of a hydrophobic siloxane-based hydrocarbon coating, which increased the water contact...
Detailed analysis of nanopores (IUPAC micropores at pore half-width x<1nm) of carbonised porous phenolformaldehyde resin microbeads used as a precursor of activated carbon (AC) and CO 2 activated carbon (at 50% burn-off) has been performed on the basis of high-resolution transmission electron microscopy (HRTEM) image analysis and nitrogen adsorption data analysed using several density functional...
Flexible, transparent, and conducting composite thin films, constructed from multi-walled carbon-nanotube-supported silver–platinum alloy nanoparticles (AgPt–MWCNT) on a flexible polyethylene terephthalate (PET) substrate through the combination of a two-step polyol process for synthesizing composites of carbon nanotubes (CNTs) and metallic nanoparticles (NPs) with an ultrasonic atomization-spin coating...
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