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

Journal Article · Mon Sep 25 00:00:00 EDT 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2357879· OSTI ID:20860931

Chou, P -W; Treschev, S; Chung, P -H; Cheng, C -L; Tseng, Y -H; Chen, Y -J; Wong, M S ^[1]

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1. Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan (China)

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 deg. C temperature range, resulting in nanostructured mixed titania phases which create interface states and effectively shift the band gap to {approx}2.7 eV. The further shift in the absorption tails up to 800 nm was attributed to carbon species-covered and/or defected titania powders.

• OSTI ID: 20860931
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 89; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
AMORPHOUS STATE
CARBON
CATALYSIS
EV RANGE 01-10
MAPPING
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