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The mechanical response of single-walled carbon nanotubes (SWCNT) filled with crystalline zinc sulphide (ZnS) nanowires under uniaxial compression is studied using classical molecular dynamics. These simulations were used to analyse the behaviour of SWCNT, with and without ZnS filling, in terms of critical force and critical strain. Force versus strain curves have been computed for hollow and filled...
Mg2+-charged spongy graphene electrodes (SGEs) were fabricated by using electrophoretic deposition of chemically exfoliated graphene oxide sheets on graphite rods. The SGEs were able to present two distinguishable signals (originated from electrochemical oxidation of guanine) in differential pulse voltammetry (DPV) of leukemia and normal blood cells, in contrast to glassy carbon electrodes giving...
A nanoporous carbon was prepared from sulfonic acid based water soluble polymer. Its direct one step carbonization followed by air oxidation led to a porous material whose surface was rich in N-, O- and S-containing groups. TEM images showed the presence of 10nm graphitic domains in the carbon matrix. When the carbon was used as a photoanode under visible light irradiation, oxygen evolution occurred...
Mesocarbon microbeads and the isostatic pressing method were used to prepare binderless nanopore-isotropic graphite (NPIG) as a neutron moderator and reflector, to inhibit liquid fluoride salt and Xe135 penetration during use in a molten salt nuclear reactor. The microstructure, thermophysical, and other properties of the NPIG were studied and compared with isostatic graphite (IG-110, TOYO TANSO CO...
Graphene oxide–tripolyphosphate material (GPM) was synthesized through an ethanolamine (EA) mediated graphene oxide (GO) self-assembly. The synthesis route to GPM is simple and benign. GPM was composed of GO nanosheets as building blocks and the tripolyphosphate as cross-linkers and chelators of cations in solutions. GPM showed higher potency for adsorption of cationic dyes than anionic dyes, and...
We report a nanoscale resistive random access memory (RRAM) device consisting of a NiO nanodot and graphene nanoribbon (GNR) nanogap electrodes. The GNR nanogap was established by an electroburning process induced by applying voltage ramp stress between the two ends of the GNR. A NiO nanodot was then deposited between the nanogapped GNR electrodes by an elaborately controllable dip pen lithography...
Photoreduction has so far received less attention than other approaches used to reduce graphene oxide (GO) like thermal and chemical reduction, although its potential is huge. The mechanism of deoxygenation is still questioned. In photolithographic applications, this means that one cannot predict whether the minimum feature size is close to the diffraction limit or larger. In this work we have studied...
This paper reports a study on the strain sensitivity response of polyvinylchloride/carbon black (PVC/CB) composites’ electrical conductivity (tensoresistivity) subjected to cyclic tensile loading. This study is part of a research program to develop sensor-enabled geogrids for performance-monitoring of reinforced earth structures. A medium-structure and a high-structure black were used as conductive...
Carbon nanotube (CNT) networks are an emerging class of material with potential applications that range from biotechnology to sensors. However, the design and fabrication of CNT networks with specific properties necessitates a deep understanding on how a variety of factors affect the performance of these materials. Of particular interest is how the substrate on which the CNT networks are assembled...
We present the capability of large-area graphene coating via superhydrophilic-assisted electro-hydrodynamic spraying deposition (SH-ESD) technology. In this paper, we detail the effect of hydrophilicity on depositing graphene sheets with electro-hydrodynamic spraying. The mechanism of graphene deposition is shown mathematically and experimentally. The resulting graphene coatings were characterized...
The preparation of sulfur/carbon composite materials for lithium–sulfur batteries is currently a very active research field. Thereto, nanoporous carbon materials are mixed with or infiltrated by sulfur to provide a close contact between both compounds. The characterization of these often complex and on the nanoscale structured composite materials is usually done by vacuum based methods such as nitrogen...
The preparation, characterization and CO2 uptake performance of N-doped porous carbon materials and composites derived from direct carbonization of ZIF-8 under various conditions are presented for the first time. It is found that the carbonization temperature has remarkable effect on the compositions, the textural properties and consequently the CO2 adsorption capacities of the ZIF-derived porous...
The growth of graphene-based nanostructures using chemical vapor deposition (CVD) is a promising approach for novel applications. CVD processes typically use high-quality metal films as catalyst substrates, and require accurate control over the experimental conditions. Here, we report the direct synthesis of Ni nanosheet/graphene composites using a DC arc plasma jet CVD method, using Ni(NO3)2 as a...
Based on detailed first-principles investigations of the hexagonal antidot patterned graphene nanomeshes, we have studied the mechanisms of the conducting property modification of graphene. The band-folding analysis shows that the (3n,3m) (n and m are integers) superlattice would have fourfold degeneracy at Г point. An effective method by removing this fourfold degeneracy, such as regularly arranging...
The Dirac cone structure of the energy band of the single-layer graphene gives rise to ambipolar conduction which results from the conversion of the conductive carriers in graphene between electrons and holes under the effect of the electrical field. Therefore, the graphene field-effect transistor (GFET) exhibits a V-shaped transfer characteristic curve with an electron and hole conduction branch...
The microstructure of three activated carbons showed direct dependence with the concentration of particular surface oxygen groups (SOGs), as implemented by dilute, sequential nitric acid treatments (10% v/v). Previous work concerning one of the three carbons displayed a SOG/π-bond structure relationship. Herein, this relationship is expanded by examining the impact of SOG implementation on crystallite...
New insight into the nature of diffusion and the origin of friction of a prototype system for weak physisorption – benzene molecules, C6H6, adsorbed on the basal plane (0001) of graphite – has been obtained with quasi-elastic neutron scattering (QENS). Spectra were measured at relative adsorbate coverages between 0.1 and 1.0monolayers (ML) and at sample temperatures between 60K and 140K. Our experimental...
The first unsubstituted, monodisperse polycyclic aromatic hydrocarbon (PAH) to form a liquid crystalline phase (100% mesophase) has been isolated. With a molecular weight of 598Da and consisting of only 14 aromatic rings, this pyrene trimer is also the lowest molecular weight (mol wt) PAH species for which the existence of liquid crystallinity has been reported. Multiple isomers of the pyrene trimer...
Understanding the mechanisms controlling the differences in adsorption properties between carbon nanomaterials (CNMs) and porous carbonaceous materials—particularly, the structure–activity correlations—is critical for exploring CNMs as special adsorbents for environmental applications. In this study, batch adsorption isotherms of 4-chloronitrobenzene (planar, aromatic) to three CNMs (single-walled...
In situ optical diagnostics are used to reveal the isothermal nucleation and growth kinetics of graphene on Ni across a wide temperature range (560°C<T<840°C) by chemical vapor deposition from single, sub-second pulses of acetylene. An abrupt, two-orders of magnitude change in growth times (∼100–1s) is revealed at T=680°C. Above this temperature, sigmoidal kinetics are measured and attributed...
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