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Open AccessArticle

Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO3 Nanoparticles

1
Lomonosov Moscow State University, Leninskiye Hills 1, 119234 Moscow, Russia
2
Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky av., 119991 Moscow, Russia
3
Zabolotny Institute of Microbiology and Virology, National Academy of Sciences of Ukraine, D0368 Kyiv, Ukraine
4
Institute of Physics, ELI Beamlines, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18221 Prague, Czech Republic
5
Konstantinov Petersburg Nuclear Physics Institute NRC KI, Orlova Roscha, 188300 Gatchina, Leningrad district, Russia
6
Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences, Adm. Makarova emb. 2, 199155 St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Molecules 2020, 25(1), 154; https://doi.org/10.3390/molecules25010154
Received: 1 December 2019 / Revised: 25 December 2019 / Accepted: 26 December 2019 / Published: 30 December 2019
(This article belongs to the Special Issue Design and Synthesis of Functional Nanomaterials)
Tungsten oxide-based bulk and nanocrystalline materials are widely used as photocatalytic and photo- and electrochromic materials, as well as materials for biomedical applications. In our work, we focused our attention on the effect of sodium cations on the structure and photochromic properties of the WO3@PVP aqueous sols. To establish the effect, the sols were synthesized by either simple pH adjusting of sodium or ammonium tungstates’ solutions, or using an ion exchange technique to remove the cations from the materials to the greatest possible extent. We showed that the presence of sodium cations in WO3@PVP favors the formation of reduced tungsten species (W+5) upon UV irradiation of the materials, strongly affecting their photochromic and photocatalytic properties. The pronounced photoreductive properties of WO3@PVP sols in photocatalytic reactions were demonstrated. Due to photoreductive properties, photochromic sols of tungsten oxide can act as effective photoprotectors in photooxidation processes. We believe that our work provides a considerable contribution to the elucidation of photochromic and redox phenomena in WO3-based materials. View Full-Text
Keywords: tungsten oxide; polyvinylpyrrolidone; ion exchange; photochromism; photocatalysis tungsten oxide; polyvinylpyrrolidone; ion exchange; photochromism; photocatalysis
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Kozlov, D.A.; Shcherbakov, A.B.; Kozlova, T.O.; Angelov, B.; Kopitsa, G.P.; Garshev, A.V.; Baranchikov, A.E.; Ivanova, O.S.; Ivanov, V.K. Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO3 Nanoparticles. Molecules 2020, 25, 154.

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