Kiev, Ukraine
Kiev, Ukraine

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Grodzyuk G.Y.,Ukrainian Academy of Sciences | Shvalagin V.V.,Ukrainian Academy of Sciences | Lavorik S.R.,LLC NanoMedTekh | Granchak V.M.,Ukrainian Academy of Sciences
Theoretical and Experimental Chemistry | Year: 2014

The optical characteristics of CdS nanoparticles doped with silver ions and produced in aqueous solutions were studied. It was shown that there is an optimum content of Ag+ ions in the composition of the semiconductor nanoparticles at which it is possible to increase their luminescence intensity by more than five times. It is suggested that such an effect of silver ions on the luminescence characteristics of CdS nanoparticles is due to the formation of additional “deep” defect levels in the bandgap of cadmium sulfide. The photogenerated charges captured at these levels participate with high efficiency in radiative recombination. © 2014 Springer Science+Business Media New York


Kozytskiy A.V.,Ukrainian Academy of Sciences | Stroyuk O.L.,Ukrainian Academy of Sciences | Breslavskiy A.Y.,Taras Shevchenko National University | Kuchmy S.Y.,Ukrainian Academy of Sciences | And 2 more authors.
Theoretical and Experimental Chemistry | Year: 2013

It was shown that nanostructured films of zinc oxide electrodeposited on the surface of conducting FTO glass can be converted into copper sulfide CuxS without affecting their morphology. The FTO/CuxS films can be used as electrocatalytically active cathodes in solar cells based on a FTO/ZnO/CdS photoanode sensitive to visible light and a sulfide/polysulfide redox couple. By using the FTO/CuxS films in place of platinum foil it is possible to increase the efficiency of light conversion by more than 20 times, from 0.07% to 1.4%. © 2013 Springer Science+Business Media New York.


Shvalagin V.V.,Ukrainian Academy of Sciences | Grodzyuk G.Y.,Ukrainian Academy of Sciences | Shvets A.V.,Ukrainian Academy of Sciences | Granchak V.M.,Ukrainian Academy of Sciences | And 3 more authors.
Theoretical and Experimental Chemistry | Year: 2015

The double tin oxide Sn3O4 with plate morphology was obtained. It was found that such semiconducting materials are photochemically active under the influence of visible light with λ > 435 nm in the photoreduction of silver ions and tetrachloroaurate to the respective metals by water with the formation o composite nanostructures. It was shown that the rate of photoreduction of silver ions to metal is substantially lower in the absence of air due, possibly, to photodegradation of the semiconductor. © 2015 Springer Science+Business Media New York


Kozytskiy A.,Ukrainian Academy of Sciences | Stroyuk O.,Ukrainian Academy of Sciences | Skoryk M.,NanoMedTekh LLC | Skoryk M.,Ukrainian Academy of Sciences | Kuchmiy S.,Ukrainian Academy of Sciences
Photochemical and Photobiological Sciences | Year: 2015

The sulfidation of copper nanoparticles deposited onto ZnO surface by the photocatalytic reduction of Cu(ii) results in the formation of ZnO/CuxS films that can be used as efficient counter electrodes in solar cells based on sulfide/polysulfide electrolytes. The films are formed by the spherical copper sulfide nano/micro-aggregates of tabulate CuxS nanoparticles with x = 1.3-1.4. A model cell with a FTO/ZnO/CdS photoanode produced by SILAR and FTO/ZnO/CuxS films as counter-electrode showed a light conversion efficiency, η = 1.73%, which is 25% higher than a similar cell where copper sulfide was deposited onto ZnO in "dark" conditions. Varying the conditions of the photocatalytic deposition of the starting copper nanoparticles slightly affects the electrocatalytic properties of the final FTO/ZnO/CuxS heterostructures. © The Royal Society of Chemistry and Owner Societies 2015.

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