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24.04.2018 | Original Paper

Enhanced UV Flexible Photodetectors and Photocatalysts Based on TiO₂ Nanoplatforms

verfasst von: D. Nunes, A. Pimentel, A. Araujo, T. R. Calmeiro, S. Panigrahi, J. V. Pinto, P. Barquinha, M. Gama, E. Fortunato, R. Martins

Erschienen in: Topics in Catalysis | Ausgabe 15-17/2018

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Abstract

In this study, titanium dioxide (TiO₂) nanostructured films were synthesized under microwave irradiation through low temperature synthesis (80 °C) and integrated in ultraviolet (UV) photodetectors and as photocatalysts. Bacterial nanocellulose (BNC), tracing paper, and polyester film were tested as substrates, since they are inexpensive, flexible, recyclable, lightweight, and when associated to low temperature synthesis and absence of a seed layer, they become suitable for several low-cost applications. The nanostructured TiO₂ films and substrates were structurally characterized by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, X-ray diffraction, and Raman spectroscopy. The optical properties of all materials were investigated. The TiO₂ nanostructured films were implemented as a photoactive layer of UV photodetectors and demonstrated significant increase of conductance upon exposed to UV irradiation. The photodetection behaviour of each material was investigated by in-situ Kelvin probe force microscopy experiments, in which the contact potential difference varied under dark or UV irradiation conditions, demonstrating higher shift for the BNC-based UV photodetector. Photocatalytic activity of the films was assessed from rhodamine B degradation under solar radiation, and BNC based devices revealed to be the best photocatalyst. The structural characteristics of the TiO₂ films and substrates were correlated to the differences in the UV photodetection and photocatalytic performances.

Graphical Abstract

Vorheriger Artikel Charge-Transfer Effect of GZO Film on Photochemical Water Splitting of Transparent ZnO@GZO Films by RF Magnetron Sputtering

Nächster Artikel Spectral Selective Solar Light Enhanced Photocatalysis: TiO2/TiAlN Bilayer Films

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Titel: Enhanced UV Flexible Photodetectors and Photocatalysts Based on TiO2 Nanoplatforms
verfasst von: D. Nunes
A. Pimentel
A. Araujo
T. R. Calmeiro
S. Panigrahi
J. V. Pinto
P. Barquinha
M. Gama
E. Fortunato
R. Martins
Publikationsdatum: 24.04.2018
Verlag: Springer US
Erschienen in: Topics in Catalysis / Ausgabe 15-17/2018
Print ISSN: 1022-5528
Elektronische ISSN: 1572-9028
DOI: https://doi.org/10.1007/s11244-018-0968-4

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