Maevskaya Maria V, Rudakova Aida V, Emeline Alexei V, Bahnemann Detlef W
Laboratory "Photoactive Nanocomposite Materials", Saint-Petersburg State University, Ulianovskaia str. 1, Peterhof, 198504 Saint-Petersburg, Russia.
Institut fuer Technische Chemie, Gottfried Wilhelm Leibniz Universitaet Hannover, Callinstrasse 3, D-30167 Hannover, Germany.
Nanomaterials (Basel). 2021 Jun 9;11(6):1526. doi: 10.3390/nano11061526.
The effect of a CuO substrate on the photoinduced alteration of the hydrophilicity of TiO and ZnO surfaces was studied. It was demonstrated that the formation of heterostructures CuO/TiO and CuO/ZnO strongly changed the direction of the photoinduced alteration of surface hydrophilicity: while both TiO and ZnO demonstrate surface transition to superhydrophilic state under UV irradiation and no significant alteration of the surface hydrophilicity under visible light irradiation, the formation of CuO/TiO and CuO/ZnO heterostructures resulted in photoinduced decay of the surface hydrophilicity caused by both UV and visible light irradiation. All observed photoinduced changes of the surface hydrophilicity were compared and analyzed in terms of photoinduced alteration of the surface free energy and its polar and dispersive components. Alteration of the photoinduced hydrophilic behavior of TiO and ZnO surfaces caused by formation of the corresponding heterostructures with CuO are explained within the mechanism of electron transfer and increasing of the electron concentration on the TiO and ZnO surfaces.
研究了CuO衬底对TiO和ZnO表面光致亲水性变化的影响。结果表明，CuO/TiO和CuO/ZnO异质结构的形成强烈改变了表面亲水性光致变化的方向：虽然TiO和ZnO在紫外光照射下均表现出表面向超亲水状态的转变，而在可见光照射下表面亲水性无明显变化，但CuO/TiO和CuO/ZnO异质结构的形成导致了紫外光和可见光照射引起的表面亲水性光致衰减。根据表面自由能及其极性和色散成分的光致变化，对观察到的所有表面亲水性光致变化进行了比较和分析。通过电子转移机制以及TiO和ZnO表面电子浓度的增加，解释了与CuO形成相应异质结构导致TiO和ZnO表面光致亲水行为的变化。
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