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. 2018 Apr 23;8(4):269. doi: 10.3390/nano8040269

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© 2018 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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Representative ultra violet-visible (UV-Vis) spectra of the TiO₂ and different (a) Au_x/TiO₂ and (b) Au₃M₃/TiO₂ photocatalysts with (insert) the respective Tauc’s plots.