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Open AccessFeature PaperArticle

TiO2 Films Modified with Au Nanoclusters as Self-Cleaning Surfaces under Visible Light

1
Laboratory of Solid-State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, Box 2414, BE-3001 Leuven, Belgium
2
Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Groenenborgerlaan 171, BE-2020 Antwerp, Belgium
3
Center for Surface Chemistry and Catalysis, KU Leuven, Celestijnenlaan 200F, BE-3001 Leuven, Belgium
4
Electron Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, BE-2020 Antwerp, Belgium
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2018, 8(1), 30; https://doi.org/10.3390/nano8010030
Received: 14 November 2017 / Revised: 14 December 2017 / Accepted: 28 December 2017 / Published: 8 January 2018
(This article belongs to the Special Issue Preparation and Application of Hybrid Nanomaterials)
In this study, we applied cluster beam deposition (CBD) as a new approach for fabricating efficient plasmon-based photocatalytic materials. Au nanoclusters (AuNCs) produced in the gas phase were deposited on TiO2 P25-coated silicon wafers with coverage ranging from 2 to 8 atomic monolayer (ML) equivalents. Scanning Electron Microscopy (SEM) images of the AuNCs modified TiO2 P25 films show that the surface is uniformly covered by the AuNCs that remain isolated at low coverage (2 ML, 4 ML) and aggregate at higher coverage (8 ML). A clear relationship between AuNCs coverage and photocatalytic activity towards stearic acid photo-oxidation was measured, both under ultraviolet and green light illumination. TiO2 P25 covered with 4 ML AuNCs showed the best stearic acid photo-oxidation performance under green light illumination (Formal Quantum Efficiency 1.6 × 10−6 over a period of 93 h). These results demonstrate the large potential of gas-phase AuNCs beam deposition technology for the fabrication of visible light active plasmonic photocatalysts. View Full-Text
Keywords: photocatalysis; gold nanoclusters; plasmonics; cluster beam deposition; stearic acid; self-cleaning surfaces photocatalysis; gold nanoclusters; plasmonics; cluster beam deposition; stearic acid; self-cleaning surfaces
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MDPI and ACS Style

Liao, T.-W.; Verbruggen, S.W.; Claes, N.; Yadav, A.; Grandjean, D.; Bals, S.; Lievens, P. TiO2 Films Modified with Au Nanoclusters as Self-Cleaning Surfaces under Visible Light. Nanomaterials 2018, 8, 30.

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