Vacuum Ultraviolet Assisted Photoreduction of Graphene Oxide Nanosheets

Films of graphene oxide nanosheets have been prepared by deposition from an aqueous alcohol emulsion onto a Teflon FEP substrate. The behavior of the films exposed to monochromatic vacuum UV radiation at a wavelength of 123.6 nm has been studied. The decrease of water content and the amount of hydroxyl (OH) groups as well as the increases of the concentration of double bonds in the film has been found after irradiation. At the same time the amount of C=O remains constant in the carboxyl and ketone groups. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3480

Supercapacitors Based on Composite Polyaniline / Reduced Graphene Oxide with Network Nanocomposite Polymer Electrolyte

The paper describes investigation on new types of supercapacitors based on composite polyani-line/reduced graphene oxide with network nanocomposite polymer electrolyte. Its prototypes are all solid state. The new network polymer electrolytes based on polyethylene glycol diacrylate and nanoparticle SiO2 was synthesized by reaction of radical polymerization in the environment of liquid organic electrolyte. The work is aimed to obtain a polymer electrolyte that is compatible with the electrode materials of superca-pacitors. For these purposes the method of FTIR spectroscopy, a.c. electrochemical impedance and gal-vanostatic cycling were used. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3551

Low Temperature Post Radiation Polymerization of Tetrafluoroethylene in the Presence of the Graphene 3D Material

It was found that irradiation by γ-rays at the liquid nitrogen temperature of a mixture of C2F4 with the grapheme 3D material obtained by explosive exfoliation of graphite oxide gives a composite in which the concentration of polytetrafluoroethylene is 80 wt %. In the case of C2F4 polymerization under similar conditions in the absence of the carbon material, the PTFE yield is six times lower. The results of certifica-tion of both the parent carbon material and the composite obtained via polymerization are also reported. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3559

Carbon Nanomaterial Produced by Microwave Exfoliation of Graphite Oxide

Carbon-based graphene-like material was obtained through microwave stimulated exfoliation of graph-ite oxide (GO). Properties of this material were investigated by multiple techniques including element analysis, X-ray photoelectron spectroscopy (XPS), mass-spectroscopy, infrared (IR) and Raman spectrosco-py, scanning electron microscopy (SEM) and broadband dielectric spectroscopy. Specific surface area and volume of microwave exfoliated graphite oxide (MEGO) reached 600 m2/g and 6 cm3/g, respectively. It is shown that during such explosive reduction process the sample emits CO2, CO and H2O and, in some cases, SO2 gases. The resulting reduced material exhibits IR spectra similar to that of graphite and a dc-conductivity of 0.12 S/cm. It is also shown that prolonged storage in ambient conditions leads to elevated oxygen content and decrease of specific surface area of the samples. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3511

Morphology of Nanostructured Alumina and Lanthana Synthesized with the Use of Fibrous Organic Matrix

Fibrous aluminum oxide γ-Al2O3 and lanthanum sesquioxide A-type La2O3 were synthesized by the thermal decomposition (700 °C, air) of cotton fibers impregnated by aqueous solutions of corresponding nitratesalts. The fibers of alumina consist of 20 nm sized particles, while the particle size of the lanthana ranges within 100–150 nm. The formation of chemisorption products on the lanthana surface is alsodiscussed. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3504

CNx film characterization by surface sensitive methods : XPS and XAES

The C 1s and N 1s XPS spectra of samples prepared: in situ (nitrogen ion implantation to graphite); ex situ films with several ratio of C/N and C/N/O and melomine (C3N6H6) have been studied. The C 1s spectra of the standard C3N6H6 have splitting 3.3 eV that cannot be explain only by the chemical interaction; besides, in that compound the atoms of carbon have only one chemical state. It is very problematic to identify the C 1s spectrum in terms only of chemical shifts, but probably it is stipulated by some unknown physical properties of the CNx and CNxOy chemical compounds. The problems of the synthesis of C3N4 are the difficulties of the formation of stoichiometric compound and a monitoring of sp3-bonds of carbon atoms as well. The possibilities of the C KVV Auger identification of sp2–sp3-bonds in CNx and CNxOy are shown