Publications on the project |
039 The nanocomposite of polyaniline with partially oxidized graphene as a transport layer of polymeric light emitting diodes |
Authors: | Posudievsky O.Yu., Lypenko D.A., Khazeeva A.A., Gribkova O.L., Nekrasov A.A., Vannikov A.V., Sorokin V.M., Koshechko V.G., Pokhodenko V.D. | |
Summary: | In the present paper the possibility of using the interpolymer complex of polyaniline with poly(2-acrylamide-2-methyl-1-propanesulfonic acid) – PAniPAPMSA – and its nanocomposites with partially oxidized graphene – PAniPAPMSA/POGr – as hole transport layer in polymer light emitting diodes (PLED) is shown. The functional characteristics of the PLED are compared with that of traditional PLED based on poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonate – PEDOT/PSS. It is established that PLED based on PAniPAPMSA/POGr nanocomposites possess higher functional characteristics – current density, brightness, current and luminous efficiency – than the heterostructures based on individual interpolymer complex PAniPAPMSA. It is shown that PAniPAPMSA/POGr nanocomposites could be used instead of PEDOT/PSS for creation of effective organic optoelectronic devices. | |
Keywords: | polyaniline, polyamidosulfonic acids, partially oxidized graphene, nanocomposite, transport layer, polymer light-emitting diodes. | |
Edition: | Theretical and Experimental Chemistry | | | 2014,
94-100,Russian |
039 Mechanochemical bundle of graphite in the presence of various inorganic salts with its subsequent liquid-phase exfoliation in graphene |
Authors: | Posudievsky O.Yu., Khazeeva A.A., Koshechko V.G., Pokhodenko V.D. | |
Summary: | In the present paper the possibility of graphite delamination by dry mechanochemical treatment in the presence of inorganic salts (NaCl, Na2SO4, CaCO3, etc.) and subsequent liquid exfoliation of the prepared nanostructured graphite materials in graphene is shown. It is established that the nature of the dispersant, hardness in particular, could significantly affect the structure imperfection in the prepared graphenes and their ability to form stable dispersions in various solvents. It was shown that Na2SO4 is the most versatile dispersant among the used inorganic salts as it allows to prepare stable graphene dispersions in N-methylpyrrolidone, dimethylformamide, ethanol as well as in water | |
Keywords: | graphene, graphite, mechanochemical treatment, inorganic salts, conductivity, stable dispersions, spectral properties. | |
Edition: | Theretical and Experimental Chemistry | | | 2014,
101-107,Russian |
039 Structure and electronic properties of poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) prepared under ultrasonic irradiation |
Authors: | Posudievsky O. Yu., Konoshchuk N. V., Shkavro A. G., Koshechko V. G., Pokhodenko V. D. | |
Summary: | Poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) anions (PEDOT/PSS) is widely used in efficient organic optoelectronic devices. The main drawback of the commercially available PEDOT/PSS aqueous dispersions is their instability. In the present work stable aqueous dispersion of PEDOT/PSSus with predominant size of polymer nanoparticles about 20 nm is prepared by oxidative polymerization of 3,4-ethylenedioxythiophene under sonication. Sonication greatly accelerates preparation as well as
increases crystallinity and conductivity of PEDOT/PSSus in omparison with the samples prepared by the common route without the application of ultrasound. It is shown that the use of diethylene glycol, dimethylformamide or dimethylsulfoxide as secondary dopants of PEDOT/PSSus increases the conductivity of the polymer films in more than one order and simultaneously decreases the value of electron work function that is important for optoelectronic applications of the polymer. | |
Keywords: | Poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate), Sonication effect, Conductivity, Crystallinity, Work function, Secondary dopant | |
Edition: | Synthetic Metals | | | 2014,
335-339,English |
039 Ultrasound-free preparation of graphene oxide from mechanochemically oxidized graphite |
Authors: | Posudievsky O. Yu., Kozarenko O. A., Khazieieva O. A., Koshechko V. G., Pokhodenko V. D. | |
Summary: | We propose an ultrasound-free preparation of graphene oxide using spontaneous exfoliation of specifically synthesized graphite oxide in water for the first time. Graphite was mechanochemically
oxidized by KMnO4 in the presence of a stoichiometric amount of sulfuric acid. The shear stresses generated during the oxidation lead to primary delamination of the graphite oxide particles and in
combination with the presence of the surface oxygen-containing functional groups facilitate their further exfoliation in water without the use of ultrasound disintegration. The synthesized graphene
oxide luminesces in the blue region of the spectrum. | |
Keywords: | graphene oxide, mechanochemical ultrasound-free preparation | |
Edition: | Journal of Material Chemistry A | | | 2013,
6658–6663,English |
039 Preparation of graphene oxide by solvent-free mechanochemical oxidation of graphite |
Authors: | Posudievsky O. Yu., Khazieieva O. A., Koshechko V. G., Pokhodenko V. D. | |
Summary: | Graphenes with different oxidation degrees are prepared by ultrasound assisted aqueous exfoliation of solvent-free mechanochemically treated graphite in the presence of solid oxidants, under comparatively mild conditions without using aggressive concentrated
acids. | |
Keywords: | oxidized graphene, solvent-free mechanochemical preparation | |
Edition: | Journal of Materials Chemistry | | | 2012,
12465–12467,English |
039 Electrochemical, electrocatalytic and electroanalytical properties of hybrid composites conducting polymer-enzyme |
Authors: | Kurys Ya.I., Dodon E.S., Kalinskaya I.A. | |
Summary: | | |
Keywords: | | |
Edition: | | | | 2011,
308–311,Russian |
039 High yield of graphene by dispersant-free liquid exfoliation of mechanochemically delaminated graphite |
Authors: | O. Yu. Posudievsky, O. A. Khazieieva, V. V. Cherepanov, V. G. Koshechko, V. D. Pokhodenko | |
Summary: | Graphenes with different oxidation degrees are prepared by ultrasound assisted aqueous exfoliation of solvent-free mechanochemically treated graphite in the presence of solid oxidants, under comparatively mild conditions without using aggressive concentrated acids. | |
Keywords: | Mechanochemical delamination of graphite, Graphene, Dispersant-free solvent exfoliation, Ethanol, Nanolayer, Nanofabrication | |
Edition: | J. Mater. Chem. | | | 2013,
,English |
039 Electrochemical performance of mechanochemically prepared polyaniline doped with lithium salt |
Authors: | O.Yu. Posudievsky, O.A. Kozarenko, V.S. Dyadyun, V.G. Koshechko,
V.D. Pokhodenko | |
Summary: | Oxides and phosphates of transition metals are now predominant cathode materials of lithium-ion batteries. Organic redox active materials, conducting polymers in particular, could be a more environmentally friendly alternative. But their electrochemical characteristics were of insufficient level as to the charge capacity, rate capability and cyclability. Here, electrochemical performance of lithium salt doped polyaniline samples prepared by echanochemical and chemical methods is comparatively analyzed as an active component of cathode masses of lithium batteries. It is shown that mechanochemically prepared polyaniline possesses specific apacity close to the theoretical limit as well as high rate capability and cyclability
during prolonged charge–discharge. | |
Keywords: | | |
Edition: | | | | 2012,
,English |
039 Structure–property relationship in mechanochemically prepared polyaniline |
Authors: | O. Yu. Posudievsky, O.A. Goncharuk, R. Barillé, V.D. Pokhodenko | |
Summary: | The comparative analysis of the physicochemical properties of polyaniline prepared in the conditions of solventless chanochemical treatment in the ball mill (PAni|mch) and polyaniline synthesized by the usual oxidative polymerization in the solvent (PAni|c) is carried out. Conductivity of PAni|mch substantially exceeds that of PAni|c. As molecular weights of PAni|mch and PAni|c are comparable, the observed difference could be connected with the influence of mechanical stress which affects the polymer during its mechanochemical preparation. The increased conductivity of polyaniline obtained by post-synthesis mechanochemical treatment of PAni|c (PAni|mt) confirms such explanation. It could be concluded from the results of the structural investigations as well as of spectral and electrochemical studies that the shear
stress which exerts influence on the polymer during mechanochemical synthesis or mechanochemical treatment leads to the increase of the interchain – interaction and, consequently, to the efficient improvement of conductivity | |
Keywords: | | |
Edition: | | | | 2010,
,English |
The events in the framework of the project |
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039 2.1. Physics and chemistry of nanomaterials and nanostructures Purpose:Development of the fundamental basis of structural-functional design of organic electronics nanomaterials based on conducting polymers Expected results:Issue of new types of products: methods, theories Stage 1:Preparation of hybrid nanocomposites based on doped organic conducting polymers (polyaniline, polypyrrole, poluthiophene) and graphenes; study of spatial and electronic structure, interaction between the components of the prepared nanocomposites. Development of methods for preparation and production of new hybrid nanocomposites based on semiconducting organic conjugated polymers (polyaniline, polythiophene) and nanostructured TiO2 and MoO3; study of their structure, spectral and luninescent properties. Stage 2:Study of electrochemical characteristics of functional hybrid nanocomposites based on organic conducting polymers (polyaniline, polypyrrole, polythiophene) and graphene. Study of the functional photovoltaic characteristics of hybrid nanocomposites based on organic conducting polymers (polyaniline, polythiophene) and nanostructured TiO2 and MoO3. Development template-free electrochemical methods of synthesis and production of composite films based on nanostructured polypyrrole and enzymes such as peroxidase, alcohol dehydrogenaze etc ., study of their structure, spectral and electrochemical properties. Stage 3:Preparation of hybrid nanocomposites based on organic semiconducting organic polymers (polyparaphenylenevinylene, polyfluorene etc.) and graphene; study of spatial and electronic structure, the interaction between the components of the prepared nanocomposites. Development of preparation methods and production of new hybrid nanocomposites based on organic semiconducting conjugated polymers (polyaniline, polythiophenes) and nanostructured TiO2 and MoO3; study of their structure, spectral and luminescent properties. Study of functional sensor characteristics of composite films based on nanostructured polypyrrole and enzymes (peroxidase, alcohol dehydrogenase). Stage 4:Study of charge transfer in hybrid nanocomposites based on organic semiconducting polymers (polythiophene, polyparaphenylenevinylene, polyfluorene) and graphene. Study of functional characteristics of hybrid nanocomposites based on organic conducting polymers (polythiophene derivatives) and nanotubes of TiO2. Development of template-free electrochemical methods of preparation and production of composite films based on nanostructured polyaniline and enzymes (peroxidase, alcohol dehydrogenase), study of their structure, spectral and electrochemical properties. Stage 5:Preparation of hybrid nanocomposites based on organic semiconducting polymers (polythiophene, polyparaphenylenevinylene, polyfluorene) and metal nanoparticles (Au, Ag); study of spatial and electronic structure, spectral and luminescent properties of the prepared nanocomposites. Studies of the structure-property inrelationship in the nanocomposites based on organic conducting polymers and nanoparticles of inorganic semiconductors. Study of functional sensor characteristics of composite films based on nanostructured polyaniline and model enzymes (peroxidase, alcohol dehydrogenase).
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