Cauliflower-like CeO2: TiO2 Hybrid Nanostructures with Extreme Photocatalytic and Self-Cleaning Properties

Salih Veziroglu, Katharina Röder, Ole Gronenberg, Alexander Vahl, Oleksandr Polonsky, Thomas Strunskus, Horst-Günter Rubahn, Lorenz Kienle, Jost Adam, Jacek Fiutowski, Franz Faupel , Oral Cenk Aktas

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Abstract

In recent years, heterogeneous photocatalysis has gained enormous interest due to increasing concerns about environmental pollution. Here we propose a facile approach to synthesize cauliflower-like CeO 2 -TiO 2 hybrid structures by magnetron reactive sputtering, exhibiting an extremely high photocatalytic activity. While heating and air-quenching of the sputter deposited TiO 2 thin film (first layer) triggered the formation of a nanocrack network, the second heat-treatment led to transformation of the CeO 2 film (second layer) into CeO 2 nanoclusters (NCs). We attribute the resulting high photocatalytic activity to the confined structure of the CeO 2 NCs and the CeO 2 -TiO 2 interface, which allows Ce 3+ /Ce 4+ dynamic shifting. In addition to high photocatalytic activity in an aqueous medium, the prepared CeO 2 -TiO 2 hybrid structures exhibited significant self-cleaning properties in air (non-aqueous).

Original languageEnglish
JournalNanoscale
Volume11
Issue number20
Pages (from-to)9840-9844
Number of pages6
ISSN2040-3364
DOIs
Publication statusPublished - 2019

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