Showing papers in "Carbon in 2013"

TL;DR: In this paper, an improved Hummers method without using NaNO3 can produce graphene oxide nearly the same to that prepared by conventional Hummers methods, which does not decrease the yield of product and simplifies the disposal of waste water because of the inexistence of Na+ and NO3− ions.

TL;DR: In this article, the formation of different types of oxygen containing functional groups in GO and their influences on its structure were analyzed using X-ray diffraction (XRD), Fourier transform infra-red spectra, x-ray photoelectron spectra (XPS), zeta potential analysis and Raman spectroscopy.

TL;DR: In this paper, the authors evaluated the dielectric properties and microwave attenuation performances over the full X-band (8.2-12.4 GHz) at a wide temperature ranging from 100 to 500 °C.

TL;DR: In this paper, the effect of dispersion state of graphene on mechanical properties of graphene/epoxy composites was investigated, and it was found that the composites with highly dispersed RGO showed higher glass transition temperature (T g ) and strength than those with poorly-dispersed RGO.

TL;DR: This article proposed a nomenclature for two-dimensional carbons that could guide authors toward a more precise description of their subject materials, and could allow the field to move forward with a higher degree of common understanding.

TL;DR: In this paper, the microstructure, electromagnetic interference shielding effectiveness (SE), DC electrical conductivity, AC electrical conductivities and complex permittivity of nanostructured polymeric materials filled with three different carbon nanofillers of different structures and intrinsic electrical properties were investigated.

TL;DR: Transparent strain sensors based on graphene were fabricated in a form of rosette on a flexible plastic or stretchable rubber substrate by using reactive ion etching and stamping techniques.

TL;DR: In this article, a one-step approach was developed for the large-scale synthesis of sulfur and nitrogen-co-doped carbon dots (S-N-C-dots) by using sulfuric acid carbonization and etching of hair fiber.

TL;DR: In this article, solution-processed graphene layers were used to reduce friction and wear on sliding steel surfaces in air (relative humidity, 30%), and small amounts of graphene-containing ethanol solution decreased wear by almost 4 orders of magnitude and friction coefficients by a factor of 6.

TL;DR: In this article, a functionalized interconnected N-doped carbon nanofibers (FN-CNFs) was used as the anode of a battery with polypyrrole as the precursor.

TL;DR: In this article, the authors discuss the genesis of impermeability in graphene and its extraordinary applications in fluid-encasement for wet electron-microscopy, selective gas-permeation, nanopore-bio-diffusion, and barrier coating against rusting and environmental hazards.

TL;DR: In this paper, a simple approach for the synthesis of fluorescent carbon dots (CQDs) has been developed by the hydrothermal treatment of gelatin in the presence only pure water, and as-synthesized CQDs were found to emit blue photoluminescence (PL) with a maximum quantum yield of 31.6%.

TL;DR: In this article, the electrochemical properties of sodium ion storage in reduced graphene oxide (RGO) were studied in an electrolyte consisting of 1M NaClO 4 in propylene carbonate (PC).

TL;DR: In this article, a simple, one-step hydrothermal method for the synthesis of highly fluorescent carbon nanoparticles (F-CNPs) with a high quantum yield (68%) and good photostability was developed.

TL;DR: In this paper, the effects of foaming on the fibers interconnectivity and orientation, electrical percolation threshold, through-plane electrical conductivity, longitudinal and transversal in-plane conductivities, dielectric permittivity, and electromagnetic interference shielding effectiveness (SE) were investigated.

TL;DR: In the field of nanotube synthesis, catalytic chemical vapour deposition (CVD) is the prevailing synthesis method of carbon nanotubes as discussed by the authors, due to its higher degree of control and its scalability.

TL;DR: In this paper, a 2D-NLDFT treatment of the fluid density in the pores was applied to the pore size analysis of activated carbons and the results showed that the typical artifacts of the homogeneous slit pore model were eliminated and the agreement with experimental data was significantly better than that of the standard slit model.

TL;DR: In this article, the friction and wear behavior of graphene-lubricated 440C steel test pairs in dry nitrogen under different loads was investigated and it was shown that a few-layer graphene is able to drastically reduce the wear and the coefficient of friction (COF) of steel during the initial sliding regime and under low load conditions.

TL;DR: In this paper, a one-pot hydrothermal approach towards three-dimensional nitrogen and sulfur co-doped graphene frameworks (N/S-GFs) employing graphene oxide and ammonium thiocyanate as the precursors is presented.

TL;DR: In this paper, a 3D reduced graphene oxide (RGO)-based hydrogels were synthesized by the reduction of graphene oxide using sodium ascorbate and showed a large surface area, and a uniform pore size distribution.

TL;DR: HCDs used as a delivery system for doxorubicin (DOX) drug delivery system exhibits pH-controlled release, and is rapidly taken up by cells.

TL;DR: In this article, it was observed that the differences in the structure of the resultant graphite oxides (GOs) greatly affect the structural properties of the graphenes resulting from their thermal exfoliation/reduction.

TL;DR: In this article, a high-resolution transmission electron microscope analysis was conducted to confirm the existence of the Fe 2 O 3 nanoparticles in the GO-Fe 2 O3 catalyst, and the results showed that the catalyst exhibited excellent catalytic property at a wide pH range of 2.09-10.09 and stable catalytic activity after seven recycles.

TL;DR: In this paper, a simple pyrolysis of graphene oxide and polyaniline was performed to obtain nitrogen-doped graphene (NG), which has excellent catalytic activity toward oxygen reduction reaction (ORR) in an alkaline electrolyte.

TL;DR: In this article, the adsorption of 4 aromatics (TCB, TCP, 2,4,6-trichlorophenol, 2-naphthol and naphthalene) on graphene (G) and graphene oxide (GO) was investigated using a batch equilibration method and micro-Fourier transform infrared spectroscopy.

TL;DR: An asymmetric supercapacitor with high energy and power densities has been fabricated using MnO2/carbon nanofiber composites as positive electrode and activated carbon nanofibers as negative electrode in Na2SO4 aqueous electrolyte as discussed by the authors.

TL;DR: In this article, the state-of-the-art methods reported in the literature regarding electrochemical synthesis of graphite flakes as well as their properties are discussed, followed by a discussion on the applications of electrochemically prepared GN flakes.

TL;DR: In this article, the authors demonstrate that large scale high quality graphene synthesis can be performed using atmospheric pressure chemical vapor deposition (CVD) on Cu and illustrate how this procedure eliminates major difficulties associated with the low pressure CVD approach while allowing straightforward expansion of this technology to the roll-to-roll industrial scale graphene production.

TL;DR: In this paper, the authors compared the thermal conductivity and shape-stability of paraffin phase change materials (PCMs) by adding exfoliated graphite nanoplatelets (xGnP) or graphene.

TL;DR: In this paper, nitrogen-doped microporous carbons were fabricated by a simple chemical activation strategy in which chitosan and K2CO3 were employed as the precursor and activation agent, respectively.