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On the mechanism of enhanced photocatalytic activity of composite TiO2/carbon nanofilms

Paper ID Volume ID Publish Year Pages File Format Full-Text
46909 46453 2011 6 PDF Available
Title
On the mechanism of enhanced photocatalytic activity of composite TiO2/carbon nanofilms
Abstract

In the search for the origin of the enhanced photocatalytic activity of composite TiO2–carbon systems, we have fabricated and analyzed well-defined model samples consisting of anatase and graphitic carbon with and without modifying the interface between them by a thin SiO2 space layer. The films with a TiO2/C interface show noticeably lower photoluminescence intensity and shorter carrier life times compared to single TiO2 films with the same thickness and composition. The stronger non-radiative recombination is mainly assigned to charge carrier leakage (transfer) at the interface between TiO2 nanocrystallites and the carbon film.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Designed and fabricated model photocatalyst systems of TiO2 and graphitic carbon. ► Charge carrier dynamics obtained from photoluminescence (PL) measurements. ► The higher photocatalytic activity is primarily related to charge carrier leakage.

Keywords
Photocatalysis; TiO2–carbon composites; Photoluminescence; Charge carriers lifetime; Charge transfer mechanism
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On the mechanism of enhanced photocatalytic activity of composite TiO2/carbon nanofilms
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 3–4, 11 August 2011, Pages 337–342
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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