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Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
28686 44085 2006 7 PDF Available
Title
Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2
Abstract

Sulfur-doped TiO2 was prepared by two methods; one was simple oxidation annealing of TiS2, the other was mixing of titanium isopropoxide and thiourea. These two sulfur-doped TiO2 preparations showed fairly different photocatalytic activity under visible light. The dynamics of photogenerated charge carriers were studied by the transient absorption measurement in the region of mid-IR. In both samples, excitation by 532 nm pulse led to photocarrier generation to the same extent. Nevertheless, the reactivity of the photocarriers was totally different. Photogenerated electrons and holes transferred to reactant gas in the latter sample, whereas they did not in the former sample. We attributed the different carrier behavior to the difference in the distribution of S atoms or particle size. These observations can explain the difference in capability of photocatalysis under visible light.

Keywords
Sulfur-doped titanium dioxide; Visible-light-response photocatalyst; Transient IR absorption; Photogenerated carriers
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Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 177, Issues 2–3, 25 January 2006, Pages 269–275
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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