SYNTHESIS OF ANATASE/BROOKITE/CARBON COMPOSITES BY LOW-TEMPERATURE THERMOLYSIS OF TITANIUM GLYCOLATE. STRUCTURE AND PHOTOELECTROCHEMICAL PROPERTIES

TiO2/C composites were prepared by thermolysis of Ti-glycolate. The composite with maximum crystallinity, brookite content and optimal carbon concentration has the highest IPCE values. Increased IPCE values are associated with the preferential formation of carbon/brookite/anatase heterostructures.TiO2/C composites were prepared by thermolysis of Ti-glycolate. The composite with maximum crystallinity, brookite content and optimal carbon concentration has the highest IPCE values. Increased IPCE values are associated with the preferential formation of carbon/brookite/anatase heterostructures.Работа выполнена в соответствии с гос. заданием ИХТТ УрО РАН (124020600024-5)

NIR PHOTOLUMINESCENCE IN C-MODIFIED TITANIUM DIOXIDE WITH ANATASE-BROOKITE MATRIXE

NIR photoluminescence was found in Ti(O,C)2/C with anatase/brookite matrix synthe-sized by thermolysis of titanium glycolate. Effect of carbon content on the NIR PL was ob-served. NIR PL is associated with radiative recombination at Ti3+ centers, which are formed under reducing condition of synthesis.Работа выполнена в соответствии с государственным заданием ИХТТ УрО РАН (тема AAAA-A19-119031890025-9)

A FACILE ROUTE OF COUPLING OF ZnO NANORODS BY CdS NANOPARTICLES USING CHEMICAL BATH DEPOSITION

Cadmium sulfide nanoparticles (NPs) coupled to zinc oxide nanorods (NRs) were synthesized in a two step deposition process at relatively low temperatures. The ZnO NRs were grown using solvothermal method, followed by the deposition of CdS NPs at 50 • C using in-situ and ex-situ synthesis from aqueous solutions. The samples were characterized by X-ray diffraction, scanning electron microscopy, and optical absorption. When the ZnO NRs are coated by the CdS NPs, the optical absorption is enhanced and band edge is shifted towards visible region as compared with ZnO NRs. Photocatalytic activity of the synthesized ZnO NRs / CdS NPs composites in the photooxidation of hydroquinone C 6 H 4 (OH) 2 in aqueous solution is closely connected with the coupling route

Synthesis of nanostructured carbon materials with different morphology of aggregates and their sorption properties with respect to nickel(II) ions

Efficient methods for the synthesis of carbon nanostructures with high specific surface area and controlled morphologies are crucial for their use in various applications. Here, we report a low-temperature precursor method for the synthesis of nanostructured carbon materials and show how the aggregate morphology and the specific surface area of isolated carbon materials depend on the composition, synthesis conditions and chemical nature of the precursor. Complex zinc compounds (carboxylates, alkoxides), capable of a pseudomorphic transformation into composites of the general composition ZnO:nC during heating in an inert gaseous medium, were used as precursors. The ZnO nanoparticles (10–15 nm) were washed from the composites by diluted formic acid. The obtained carbon materials exhibit different morphologies and specific surface areas up to 1706 m2/g. For two synthesized carbon materials, their sorption properties with respect to nickel(II) ions were studied. It was found that these materials, despite the differences in the morphology and specific surface areas of their particles, have the same sorption capacity with respect to nickel ions. Sorption has a physical nature and is well described by the Langmuir isotherm

Concentration and temperature dependence of the structural, magnetic, and dielectric properties of La2Ni(Mn1-xRux)O6 solid solutions

The crystal structure, magnetic ordering, and dielectric characteristics of polycrystalline powder samples of La2NiMn1-xRuxO6 (x = 0.25-0.75) solid solutions have been studied. The X-ray diffraction results were analysed in detail, and reliably show that all compounds have a monoclinic (P2(1)/n) structure with Ni and Mn/Ru ions occupying the 2c and 2d sites, respectively. Magnetic susceptibility measurements reveal a ferromagnetic order for La2NiMn0.75Ru0.25O6 and La2NiMn0.5Ru0.5O6. The ferromagnetic transition temperature decreases from 200 K for La2NiMn0.75Ru0.25O6 to 175 K for La2NiMn0.5Ru0.5O6. Dielectric measurements show large dielectric constants (similar to 10(4)) at room temperature. In addition, the temperature-dependent loss-tangent Tan delta(T) curves reveal relaxation characteristics due to charge transfer between nearest cations