LLC NanoMedTekh

Kiev, Ukraine

LLC NanoMedTekh

Kiev, Ukraine
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Hrytsenko O.,Kharkiv Polytechnic Institute | Hrytsenko D.,Kharkiv Polytechnic Institute | Shvalagin V.,Ukrainian Academy of Sciences | Grodziuk G.,Ukrainian Academy of Sciences | And 3 more authors.
Journal of Nanomaterials | Year: 2017

Ag nanoparticles are perspective for the use in ink-jet printed smart packaging labels in order to protect a customer from counterfeit or inform them about the safety of consumption of a packaged product via changeable luminescence properties. It is determined that, to obtain printed images with the highest luminescence intensity, using the most technologically permissible concentration of fluorescent component in the ink composition and applying inks to papers with the lowest absorbance are recommended. The highest contrast of a tone fluorescent image can be obtained on papers with high degree of sizing. It is found that the use of papers with low optical brightness agent (OBA) content with a wide range of luminescence intensity allows obtaining the same visual legibility of a printed nanophotonic label. The increase in the relative area of raster elements of an image leads to nonlinear increase in luminescence intensity of printed images in long-wave area of visible spectrum, affecting the luminescence color of a printed label. For wide industrial production of printed nanophotonic labels for smart packaging, the created principles of reproduction of nanophotonic images applied onto paper materials by ink-jet printing technique using printing inks containing Ag nanoparticles should be taken into account. © 2017 Olha Hrytsenko et al.


Shvalagin V.V.,Ukrainian Academy of Sciences | Grodzyuk G.Y.,Ukrainian Academy of Sciences | Andryushina N.S.,Ukrainian Academy of Sciences | Granchak V.M.,Ukrainian Academy of Sciences | And 2 more authors.
Theoretical and Experimental Chemistry | Year: 2017

It was established that treatment of layered KNb3O8 with nitric acid leads to the formation of K3H3Nb10.8O30. The obtained material has a layered structure and consists of crystals with lengths of 5-20 μm and widths in the order of 200-500 nm similar to the initial KNb3O8. Potassium niobate KNb3O8 and its transformation product K3H3Nb10.8O30 can act as photocatalysts in the decomposition of methanol. They have practically the same activity in this process. © 2017 Springer Science+Business Media New York


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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