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. 2016 Apr 13;21(4):486. doi: 10.3390/molecules21040486

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Au4f XPS spectra of Au/TiO₂ (a,c,e) and Au/La₂O₃/TiO₂ (b,d,f). Catalyts: as-prepared (a,b); after use in reaction (c,d); and after long term storage (e,f).