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By means of Density Functional Theory calculations we evaluate several lithium carbonate - graphite interface models as a prototype of the Solid Electrolyte Interphase capping layer on graphite anodes in lithium-ion batteries. It is found that only an (a,b)-oriented Li2CO3 slab promotes tight binding with graphite. Such mutual organization of the components combines their structural features and reproduces...
Twisted bilayer graphene (tBLG) provides an opportunity to control the optoelectronic properties of graphene owing to the relative orientation (θ)-induced van Hove singularities (vHs). However, how different environments affect vHs behaviors of various tBLGs and their Raman resonance window is not clear. A study of the optical vHs properties of tBLGs on a quartz substrate, prepared by chemical vapor...
Two types of the spherical growth form of graphite from different precursors, pyrolytic graphite spheres (PGSs) formed by pyrolysis of propylene and spheroidal graphite nodules (SGNs) formed by heat treatment of the medium carbon steel, are investigated by scanning electron microscopy and transmission electron microscopy. Microstructural similarities and differences of these graphite spheres are drawn...
An improved technique of the ultrasound-assisted reversible liquid–liquid transfer of pristine (unmodified) C60 and C70 fullerenes between organic solutions and aqueous fullerene dispersions (AFD; another notation in general use, nC60, nC70) without any additional reagents (media modifiers) was developed. To our knowledge, this is the first report of such a fullerene transfer from an AFD to an organic...
Electrocharging assisted process is a method for the incorporation of carbon in molten metals under high electric current which results in the formation of networks of carbon nanostructures inside the metal matrix, and gives the new material improved mechanical, electrical and thermal properties. Alloys produced with this method are called covetics. In our previous works, different characterization...
The relationship between the microstructure and the electrical behavior of nickel/carbon nanocomposite (nc-Ni/C) thin films is reported. A particular attention was accorded to the role of the chemical composition and the nature of the amorphous carbon matrix on the electrical behavior of the material. The nc-Ni/C thin films were synthesized using two different cold plasma processes both allowing to...
The present study reports two routes to modify reduced graphene oxide (rGO) nanosheets with polysulfone (PSU) brushes via nitrene chemistry. The PSU polymer is bonded to rGO at the extremity (rGO-PSU end) and at the middle of the PSU chain (rGO-PSU mid). The resulting rGO-PSU synthetic products are carefully characterized by Raman and FTIR spectroscopy, XPS, TEM, and thermogravimetric analysis, evidencing...
The aim of this study was to develop a hybrid Gr nanosheets-sodium alginate (SA)/polyvinyl alcohol (PVA) (Gr-AP) fibrous scaffold with exceptional toughness and electrical conductivity for nerve tissue engineering. Furthermore, the effects of Gr concentration (0, 0.5, 1, 2 and 5 wt%) on the electrical, mechanical, physical and biological properties as well as degradation date of scaffolds were evaluated...
We present a new morphologically disordered slit-shaped pore (MDSP) model for simulating gas adsorption in micro-mesoporous carbonaceous materials. The MDSP model qualitatively accounts for the inherent roughness of carbon pore walls in accord with the atomistic structural model of LMA10 reference carbon material. The MDSP model is applied to pore size distribution (PSD) calculations from nitrogen...
Aided by Oxone, water-dispersible graphene of 2–5 atomic layers was electrochemically fabricated from graphite in one step without any extra stabilizers or additives. Oxone as a novel electrolyte and the electrochemically enhanced oxidation were responsible for the excellent aqueous dispersibility, effective exfoliation and the reasonably high yield (up to 60.1%).
Carbon coated aligned multi-walled carbon nanotube (AMWCNT/C) sheets were used for studying the controlled radial growth of MWCNTs. Pyrolytic carbon (PyC) was deposited on the surface of nanotubes using multiple cycles of chemical vapor infiltration. Morphological and structural characterization showed that when graphitization was done in one step, after the deposition of multiple cycles of PyC, the...
Graphene sheets were spontaneously functionalized with anthraquinone molecules in a one-pot process, during the oxidative electrochemical exfoliation of a graphite electrode in a 0.1 M H2SO4 solution containing anthraquinone diazonium ions. This counterintuitive process involves the electrochemical oxidation of graphite and reduction of diazonium ions and functionalization occurs by spontaneous reaction...
Se-impregnated hollow carbon (C-Se) microspheres were studied as cathode materials for Li-Se batteries. Hollow carbon microspheres containing micro- and mesopores were prepared by SnO2 leaching in the core-shell-structured SnO2@C composite microspheres prepared by one-pot spray pyrolysis. The mean size of the empty cores and the mean shell thickness of the hollow carbon microspheres were 490 and 90 nm,...
The characteristics of two dimensional (graphene), one dimensional (single walled carbon nanotube incorporated poly(3,4-ethylenedioxythiophene):polystyrene sulfonate, composite) and zero dimensional (ZnO quantum dots) nanostructures have been systematically analyzed to elucidate the possibility of employing such nanostructures (transparent conducting corrosion resistant (TCCR)) for the passivation...
The through-thickness electric permittivity (real part) of the solid part (53 vol%) of reduced graphite oxide (RGO) paper (100–300 μm thick, prepared by hydrazine reduction of modified-Hummers-method graphite oxide, GO) is 1130 (50 Hz), which is higher than that of the similarly tested parent GO (915, 50 Hz) and other carbons (31–124, 50 Hz). The high permittivity of RGO is attributed to the defects...
Inspired by interfacial interactions of protein matrix and the crystal platelets in nacre, herein, a super-tough artificial nacre was produced through constructing the synergistic interface interactions of π-π interaction and hydrogen bonding between graphene oxide (GO) nanosheets and sulfonated styrene-ethylene/butylene-styrene copolymer synthesized with multifunctional benzene. The resultant GO-based...
The wet transfer of graphene requires sacrificial layer, which can support graphene during the removal of metallic substrate and prevent mechanical damage of thin graphene. However, the used polymer layer leaves an amounts of debris or residue on the graphene surface. The typical amorphous thermoplastic resins that consist of macromolecular chains with no crosslinks between the chains have been investigated...
The electrochemical double layer capacitance (EDLC) of untreated and thermally-activated polyacrylonitrile based carbon felts is correlated with their active surface area (ASA), consisting of edge planes and defects, and the amount of basal planes, which can be calculated from the difference between total and active surface area (TSA-ASA). The ASA was estimated by oxygen chemisorption and desorption...
Carbon Nanotubes (CNTs) have been oxidized with ozone in the gas phase and different Advanced Oxidation Processes (AOPs) in the aqueous phase such as H2O2/UV, Fenton reaction and ozonation, in order to functionalize them. A significant difference between the amounts and types of oxygen containing groups were generated using different oxidants. To investigate the efficiency of the oxidation methods,...
It is demonstrated that the performances of supercapacitors are often affected by the electrochemical interface in their electrodes. In this work, the electrochemical interface in carbon nanofiber (CNF)/carbon nanotube (CNT) hierarchical composites was well optimized by tuning the diameters of electrospun CNF skeletons and the densities/lengths of CNT hierarchies. The optimized CNF/CNT composites...
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