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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The absorption spectra measured using a UV–vis spectrophotometer. (a) Diffused absorption spectra and appearance of anodic oxides. (b) Plots of the Kubelka–Munk transformation of the absorption spectrum of the oxide.