Abstract: | |
Multilayered films of TiO2 with ordered cubic mesoporosity were grown via layer-by-layer deposition on a conductive FTO (F-doped SnO 2) substrate by dip-coating and subsequent calcination at 400°C. Since platinum nanoparticles are known to enhance the photocatalytic activity, they were introduced into the TiO2 mesopores by pulsed electrodeposition. Additionally, sandwich-like layers with up to five alternating TiO2 and Pt layers were prepared. The photocatalytic gas-phase oxidation of acetaldehyde served as a test reaction to characterize the activity in the gas phase of both pristine TiO2 as well as Pt/TiO2 single- and multilayer films. The ordered mesoporous pristine TiO2 and Pt/TiO2 nanocomposites exhibited significantly higher photoactivity than commercial Pilkington Activ™ glass and dense TiO2 films. Moreover for pristine TiO2 films, those consisting of three layers (about 650 nm in thickness), were shown to be sufficient to achieve a maximum photonic efficiency of ζ = 0.45%. For the Pt/TiO2 system, however, a single-layer film with a total thickness of only about 220 nm exhibited an almost identical activity. Moreover, repetitive experiments demonstrated that the newly prepared photocatalyst films did not suffer from a decrease in the photocatalytic activity, evincing their potential for practical applications. © 2011 The Royal Society of Chemistry.
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License of this version: | Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. |
Publication type: | Article |
Publishing status: | publishedVersion |
Publication date: | 2011 |
Keywords english: | Dip coating, Gas phase oxidation, Gasphase, Layer by layer deposition, Meso-pores, Mesoporosity, Multi-layered, Multi-layered films, Ordered mesoporous, Photo-catalytic, Photoactivity, Photocatalyst film, Photocatalytic activities, Photonic efficiencies, Pilkington, Platinum nanoparticles, Pulsed electrodeposition, Single layer films, Test reactions, Three-layer, TiO, Aldehydes, Calcination, Conductive films, Deposition, Film preparation, Nanocomposite films, Nanocomposites, Photocatalysis, Photocatalysts, Platinum, Titanium dioxide, Multilayer films |
DDC: | 540 | Chemie |
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