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

ABSTRACT: 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

SUBMITTER: Kozlov DA 

PROVIDER: S-EPMC6982781 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature