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Spray coating is proposed as an optional wet method for preparing nano-sized particles suitable for the growth of single-walled carbon nanotubes (SWCNTs). The obtained SWCNT films are characterized by Raman spectroscopy and electron microscopy, and are confirmed to be comparable to SWCNTs produced by the conventional dip-coating process in terms of crystallinity, tube diameter and carbon yield. The...
Porous carbide-derived carbons (CDCs) are synthesized from different carbide (VC, TiC, NbC) as electrode materials for electrochemical capacitors. The process of carbide–carbon transformation is investigated by observations at different carbide/CDC interfaces. It is found that the restructuring process has much influence on formation of microstructure as well as the resultant electrochemical performance...
Single or few layer graphene can be considered an exciting pseudo-two-dimensional molecular material that potentially has a wide range of applications. A critical bottleneck may arise with issues in their controlled assembly into macroscopic ensembles over large areas both in two and three dimensions. Langmuir-type assembly is a particularly useful method to control and manipulate the distribution...
Carbon nanotube papers have many potential applications from actuators to electrodes. Cross-linked papers with embedded nanoparticles are now being investigated for use in these applications. Here we report on the development of piezoelectric multi-walled carbon nanotube paper. The piezoelectric effect of the paper was enhanced by four orders of magnitude by embedding zinc oxide nanoparticles into...
A carpet structure composed of high purity cup-stacked carbon nanotubes (CSCNTs) was synthesized by a catalytic chemical vapor deposition method. In a 15-min growth time, the CSCNT carpet with a height up to ∼300μm and carbon purity above 99.9wt.% was prepared. Transmission electron microscopy observations indicated that the CSCNTs with diameters ranging from 80nm to 230nm consist of truncated conical...
The nanostructure of amorphous carbon thin film is described in terms of a disordered conductive sp 2 phase embedded in an electrically insulating sp 3 matrix. The conductive sp 2 phase is dominated by Drude type free-carries response, and the carrier conductive between sp 2 clusters is hopping. The two conductivities are in a serial configuration under a percolation...
Optical reflection from an array of vertically aligned multiwalled carbon nanotubes (MWCNTs) acting as a black body absorber was investigated. We present the novel results of the experimental analysis of specular reflection involving the different light polarization configurations and wavelengths from visible and near infrared range. It was shown that with the increasing incidence angle, reflectance...
Graphene oxide was directly reduced into graphene in N-methyl-pyrrolidone with the assisted-dispersion of vapor grown carbon nanofibers (VGCF), resulting in a homogeneous dispersion of VGCF–graphene hybrid filler (VGCF–G). In the hybrid filler, VGCF served as effective stabilizers for graphene by adsorbing VGCF onto graphene through π–π interaction. Subsequently, the as-prepared VGCF–G was incorporated...
Carbon nanotube reinforced polymer composites may provide a unique option for the aviation industry due to their high strength-to-weight ratio and multifunctionality. Specifically their electrical conductivity and consequent shielding capabilities can be strongly enhanced by featuring vertically aligned nanotube arrays in the polymer composites. We report here a detailed study of the electrical transport...
Carbon materials have been widely used as cathodes in lithium oxygen batteries but the detailed influence of the structure of these materials on their performance is not very clear yet. In this study, the same starting pristine commercial carbon black (N330) was treated under different atmospheres and the resultant carbons were employed as cathode materials for lithium oxygen batteries. It was demonstrated...
Volcanic stones from the Greek island of Santorini have been used as natural catalysts for the growth of multiwalled carbon nanotubes by chemical vapor deposition. In a unique geomimetic experiment, we show that a synthetic catalyst mimicking the natural rock can lead to highly selective production of thin multiwalled tubes.
The reduced state carbon dot (r-CD) is a new kind of carbon dot (CD) prepared by using sodium borohydride. Herein, we find that the r-CDs can directly reduce chloroauric acid to form gold nanoparticles (AuNPs) without adding other reducers or stabilizers. At the same time, we deduced that the hydroxyl groups (–OH) on the surfaces of r-CDs can act as both reducer and stabilizer for the synthesis of...
CNT–TiO 2 nanohybrids were synthesized using CNTs as a substrate and isopropyl titanate as a titanium source by a hydrothermal method. The nanohybrids were characterized by SEM and XRD, and their dispersion ability as an emulsion was investigated by optical microscopy. Ruthenium was loaded onto TiO 2 and the nanohybrids by an impregnation method, and their catalytic performance was...
Artificial graphite containing abundant in situ grown onion-like carbon hollow nanostructures (OCHNs) was prepared from nickel nanoparticles doped pitch and natural graphite flakes by hot-pressing sintering method. Galvanostatic discharge–charge tests indicate that the synthetic graphite with abundant OCHNs exhibits a high specific capacity of 460mAhg −1 at 20mAg −1 as well as an excellent...
We report on a facile, simple, and green graphene oxide (GO) reduction method based on a supercritical alcohol approach. The influence over the chemical, thermal, morphological, and textural properties of reduced graphene oxides (RGOs) of five different alcohols in their supercritical conditions – methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol – was investigated in detail. Although the thermal...
We propose an effective method for making three-dimensional self-assembled foam-like graphene (SFG) with controllable pore size using a nucleate boiling method. We fabricated different SFGs using nucleate boiling in reduced graphene oxide (RGO) colloid at heat fluxes of 800, 900, 1000, 1100, 1200, and 1300kW/m 2 with tunable pore size, by controlling the heat flux. The resulting pore size...
Aerosol filters, made with conventional micro-fiber fabrics, are designed to efficiently capture small particles from the air. Filters constructed of nano-fiber fabric structures provide even greater filtration efficiency than conventional micro-fiber fabrics due to their higher surface area and smaller pore size. Carbon nanotubes (CNTs) are very small diameter fibers that have the potential to be...
Vertically oriented graphene nanosheets are promising electrode materials for electrochemical double-layer capacitors. The external surface area of the nanosheets allows for extremely fast response times compared to porous carbon materials currently used. Furthermore, the high edge density increases the charge storage ability of the material. In this paper Ar + ions were used to create a larger...
The presence of defects can introduce important changes in the electronic structure of graphene, leading to phenomena such as C magnetism. In addition, vacancies are reactive and permit the incorporation of dopants. This paper discusses the electronic properties of defective graphene for O and B decoration. Phonon calculations allow us to address directly the stability of the systems under study....
Mesoporous carbon (MC), prepared by the carbonization of phenol resin using ethylene glycol as a pore forming agent, was used as the catalyst of the counter electrode in dye-sensitized solar cells (DSCs) fabricated by a paste coating method at low temperature, where a non-ionic surfactant, Triton X100, was used as a modifier of the paste. Fractal dimensions (D F ) were used to evaluate the...
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