Geodesic
Synthesis and comparative photocatalytic activity of CuO layers on SiO$_{2}$ substrates
Nanosistemy: fizika, himiâ, matematika, Tome 11 (2020) no. 5, pp. 601-607.

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Using the thermodynamic and kinetic approaches, it was found that Cu(NH$_{3}$)$^{2+}_{4 aq}$ complex predominating at 23$^{\circ}$C spontaneously decomposes at elevated temperatures, forming CuO precipitate in a bulk solution and a layer (CuO||SiO$_{2}$) 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(NH$_{3}$)$^{2+}_{4 aq}$ complex. The formation of the CuO precipitate and layer is a two-step kinetic process. The rate of precipitate formation dominates above 65$^{\circ}$C while the rate of the layer formation prevails below this value. The CuO$\parallel$SiO$_{2}$ 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||SiO$_{2}$ 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.
Keywords: Copper(II), oxide, layer, glass, kinetics
Mots-clés : surface, photocatalyst. 
@article{NANO_2020_11_5_a13,
     author = {E. V. Polyakov and R. R. Tzukanov and I. V. Volkov and L. Yu. Buldakova and I. V. Baklanova and O. A. Lipina and V. P. Zhukov and Yu. V. Kuznetsova and A. P. Tutyunnik and M. A. Maximova},
     title = {Synthesis and comparative photocatalytic activity of {CuO} layers on {SiO}$_{2}$ substrates},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {601--607},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2020_11_5_a13/}
}
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%A R. R. Tzukanov
%A I. V. Volkov
%A L. Yu. Buldakova
%A I. V. Baklanova
%A O. A. Lipina
%A V. P. Zhukov
%A Yu. V. Kuznetsova
%A A. P. Tutyunnik
%A M. A. Maximova
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%J Nanosistemy: fizika, himiâ, matematika
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E. V. Polyakov; R. R. Tzukanov; I. V. Volkov; L. Yu. Buldakova; I. V. Baklanova; O. A. Lipina; V. P. Zhukov; Yu. V. Kuznetsova; A. P. Tutyunnik; M. A. Maximova. Synthesis and comparative photocatalytic activity of CuO layers on SiO$_{2}$ substrates. Nanosistemy: fizika, himiâ, matematika, Tome 11 (2020) no. 5, pp. 601-607. http://geodesic.mathdoc.fr/item/NANO_2020_11_5_a13/