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Title: | Anodic luminescence, structural, photoluminescent, and photocatalytic properties of anodic oxide films grown on niobium in phosphoric acid | Authors: | Stojadinović, Stevan Tadić, N. Radić, Nenad Stefanov, Plamen Grbić, Boško Vasilić, Rastko |
Keywords: | Anodization;Luminescence;Niobium;Photocatalytic activity;Photoluminescence;Plasma electrolytic oxidation (PEO) | Issue Date: | 15-Nov-2015 | Journal: | Applied Surface Science | Abstract: | This article reports on properties of oxide films obtained by anodization of niobium in phosphoric acid before and after the dielectric breakdown. Weak anodic luminescence of barrier oxide films formed during the anodization of niobium is correlated to the existence of morphological defects in the oxide layer. Small sized sparks generated by dielectric breakdown of formed oxide film cause rapid increase of luminescence intensity. The luminescence spectrum of obtained films on niobium under spark discharging is composed of continuum radiation and spectral lines caused by electronic spark discharging transitions in oxygen and hydrogen atoms. Oxide films formed before the breakdown are amorphous, while after the breakdown oxide films are partly crystalline and mainly composed of Nb 2 O 5 hexagonal phase. The photocatalytic activity of obtained oxide films after the breakdown was investigated by monitoring the degradation of methyl orange. Increase of the photocatalytic activity with time is related to an increase of oxygen vacancy defects in oxide films formed during the process. Also, higher concentration of oxygen vacancy defects in oxide films results in higher photoluminescence intensity. |
URI: | https://physrep.ff.bg.ac.rs/handle/123456789/1046 | ISSN: | 0169-4332 | DOI: | 10.1016/j.apsusc.2015.07.174 |
Appears in Collections: | Journal Article |
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