Observation of carbon-containing nanostructured mixed titania phases for visible-light photocatalysts

This research analyzed a visible-light-responsive carbon-containing titania photocatalysts prepared by sol-gel method using confocal Raman spectral mapping, transmission electron microscopy, and UV/visible spectroscopy. The incorporation of carbons in the initial titania powder of anatase and amorph...

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Bibliographic Details
Published in:Applied physics letters 2006-09, Vol.89 (13)
Main Authors: Chou, P.-W., Treschev, S., Chung, P.-H., Cheng, C.-L., Tseng, Y.-H., Chen, Y.-J., Wong, M. S.
Format: Article
Language:English
Subjects:
ABSORPTION
AMORPHOUS STATE
CARBON
CATALYSIS
EV RANGE 01-10
MAPPING
MATERIALS SCIENCE
NANOSTRUCTURES
PHOTOCHEMISTRY
POWDERS
RAMAN SPECTRA
RUTILE
SOL-GEL PROCESS
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
ULTRAVIOLET SPECTRA
VISIBLE RADIATION
VISIBLE SPECTRA
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Summary:This research analyzed a visible-light-responsive carbon-containing titania photocatalysts prepared by sol-gel method using confocal Raman spectral mapping, transmission electron microscopy, and UV/visible spectroscopy. The incorporation of carbons in the initial titania powder of anatase and amorphous phases was found to facilitate the formation of rutile or brookite phases from the amorphous phase in the 150–250°C temperature range, resulting in nanostructured mixed titania phases which create interface states and effectively shift the band gap to ∼2.7eV. The further shift in the absorption tails up to 800nm was attributed to carbon species-covered and/or defected titania powders.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2357879