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Silver and gold modified plasmonic TiO2 hybrid films for photocatalytic decomposition of ethanol under visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
55453 47053 2012 7 PDF Available
Title
Silver and gold modified plasmonic TiO2 hybrid films for photocatalytic decomposition of ethanol under visible light
Abstract

Plasmonic noble metal nanoparticles (NPs) (silver and gold) are able to sensitise photocatalysts in visible light by modifying the TiO2 surface with 0.5 wt% loading. These plasmonic catalysts were supported by optically transparent zirconium dioxide and layer silicate. The hybrid catalyst films (with ∼10 μm thickness) were prepared by sputtering the aquatic suspension of the catalyst/support suspension on glass slides and irradiated the films by visible light (λ ≥ 435 nm). The photocatalytic efficiency was studied on decomposition of ethanol vapour, and the residual concentration of ethanol was monitored. The intermediates during illumination were analysed by GC–MS. Modifications with silver and gold lead to a change in the optical properties due to the plasmonic light absorption on TiO2. The supporting binding materials are almost transparent in UV–vis wavelength range, thus Ag- and Au-modified TiO2 can be excited by the incoming light without much loss of the photon energy. Furthermore, the layered silicate promoted the photocatalytic process by its high adsorption capacity. Due to these two phenomena, a synergistic effect was found on the photocatalytic activity of the nanocomposite hybrid films.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (67 K)Download as PowerPoint slideHighlights► Ag and Au nanocrystals on TiO2 changes the optical and photocatalytic properties. ► Plasmonic effect (Ag and Au) enhanced the photon absorption of visible light on TiO2. ► Synergistic effect is observed using transparent supporting material and noble metals.

Keywords
Titanium dioxide; Silver; Gold; Plasmonic properties; Nanohybird films; Photooxidation
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Silver and gold modified plasmonic TiO2 hybrid films for photocatalytic decomposition of ethanol under visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 181, Issue 1, 12 February 2012, Pages 156–162
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us