najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2020-11-4-480-487najo-418Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХVisible light photoluminescence in TiO2/CdS nanopowders synthesized by sol-gel route: effect of gel aging timeUlyanovaE. S.

Pervomayskaya, 91, Ekaterinburg, 620990Pervomayskaya, 91, Ekaterinburg, 620990

tsivileva.yekaterina@yandex.ruZamyatinD. A.

Vonsovskogo, 15, Ekaterinburg, 620075

Mira, 9, Ekaterinburg, 620002

dzamyatin85@gmail.ruKolosovV. Yu.

Mira, 9, Ekaterinburg, 620002

Kolosov@urfu.ruShalaevaE. V.

Pervomayskaya, 91, Ekaterinburg, 620990

shalaeva@ihim.uran.ruInstitute of Solid State Chemistry of Ural Branch of the Russian Academy of SciencesRussian FederationInstitute of Geology and Geochemistry of Ural Branch of the Russian Academy of Sciences; Ural Federal University named B.N. YeltsinRussian FederationUral Federal University named B.N. YeltsinRussian Federation202029072025114480–487Copyright © Ulyanova E.S., Zamyatin D.A., Kolosov V.Y., Shalaeva E.V., 20252025Ulyanova E.S., Zamyatin D.A., Kolosov V.Y., Shalaeva E.V.Ulyanova E.S., Zamyatin D.A., Kolosov V.Y., Shalaeva E.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/418

A series of sol-gel TiO2/CdS, TiO2 powders and coagulated CdS nanoparticles were studied by XRD, HRTEM and Raman spectroscopy to elucidate the effect of low-temperature gel aging time on visible photoluminescence (PL) emission of the TiO2/CdS composites. With an increase in aging time a content of amorphous titania and incorporated CdS nanoparticles decreases in composites. For all composites, visible PL emission includes bands attributed to surface oxygen vacancies and hydroxyl group of TiO2 nanocrystals, as well as yellow-green and red bands related to lattice defect states of CdS nanoparticles. It was found that gel aging time is a crucial parameter to influence visible PL emission in composites. This emission is suppressed with increasing aging time, and its evolution shows that healing of oxygen vacancy defects and hydroxyl group affect visible emission more significantly than improving crystallinity degree. The correlation between visible PL emission in TiO2/CdS and their visible-light photocatalytic activity was discussed.

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The authors declare that there are no conflicts of interest present.