najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2020-11-5-601-607najo-403Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХSynthesis and comparative photocatalytic activity of CuO layers on SiO2 substratesPolyakovE. V.

91, Pervomaiskaya str., Ekaterinburg, 620990

polyakov@ihim.uran.ruTzukanovR. R.

91, Pervomaiskaya str., Ekaterinburg, 620990

VolkovI. V.

91, Pervomaiskaya str., Ekaterinburg, 620990

BuldakovaL. Yu.

91, Pervomaiskaya str., Ekaterinburg, 620990

BaklanovaI. V.

91, Pervomaiskaya str., Ekaterinburg, 620990

LipinaO. A.

91, Pervomaiskaya str., Ekaterinburg, 620990

ZhukovV. P.

91, Pervomaiskaya str., Ekaterinburg, 620990

KuznetsovaYu. V.

91, Pervomaiskaya str., Ekaterinburg, 620990

TutyunnikA. P.

91, Pervomaiskaya str., Ekaterinburg, 620990

MaximovaM. A.

91, Pervomaiskaya str., Ekaterinburg, 620990

Institute of Solid State Chemistry UB RASRussian Federation202029072025115601–607Copyright © Polyakov E.V., Tzukanov R.R., Volkov I.V., Buldakova L.Y., Baklanova I.V., Lipina O.A., Zhukov V.P., Kuznetsova Y.V., Tutyunnik A.P., Maximova M.A., 20252025Polyakov E.V., Tzukanov R.R., Volkov I.V., Buldakova L.Y., Baklanova I.V., Lipina O.A., Zhukov V.P., Kuznetsova Y.V., Tutyunnik A.P., Maximova M.A.Polyakov E.V., Tzukanov R.R., Volkov I.V., Buldakova L.Y., Baklanova I.V., Lipina O.A., Zhukov V.P., Kuznetsova Y.V., Tutyunnik A.P., Maximova M.A.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/403

Using the thermodynamic and kinetic approaches, it was found that Cu(NH3) complex predominating at 23◦C spontaneously decomposes at elevated temperatures, forming CuO precipitate in a bulk solution and a layer (CuO||SiO2) on the surface of silica glass. The rates of these heterogeneous processes are fairly well described by the 1st-order reaction of decay of the Cu(NH3)complex. The formation of the CuO precipitate and layer is a two-step kinetic process. The rate of precipitate formation dominates above 65 C while the rate of the layer formation prevails below this value. The CuO||SiO2 material synthesized below 65◦ possesses an optical bandgap of (1.25±0.05) eV, which is smaller compared to the crystals of commercial CuO. The CuO||SiO2 material displays a photocatalytic activity in the reaction of UV-decomposition of benzoquinone-hydroquinone. It was discovered that the photocatalytic activity depends on the thickness of the photocatalyst layer.

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