DOI: 10.1002/cphc.200400185. Bandgap Widening of Titania through Semiconductor Support Interactions

Bandgap Widening of Titania through Semiconductor Support Interactions

10.1002/cphc.200400185

Crossref journal-article

Wiley

ChemPhysChem (311)

Abstract

AbstractSilica‐supported titania powders with 50, 36, 13 and 4 wt % of TiO2 (TiO2‐50/SiO2, TiO2‐36/SiO2, TiO2‐13/SiO2 and TiO2‐4/SiO2) were prepared by hydrolysis of TiCl4 in the presence of silica, followed by calcination at 500 °C. The formation of TiOSi linkages was confirmed by diffuse reflectance infrared Fourier transform spectroscopy. Atomic force microscopy indicated the presence of titania crystals larger than 15 nm. All supported materials exhibited a blue‐shift of the TiO2 absorption edge, which was attributed to an electronic semiconductor support interaction. Bandgap energies of TiO2‐50/SiO2, TiO2‐36/SiO2, TiO2‐13/SiO2 and TiO24/SiO2 were measured to be 3.28, 3.36, 3.40 and 3.42 eV, respectively, as compared to 3.15 eV for unsupported TiO2. From these values, and from the quasi‐Fermi level of electrons, a high anodic shift of both the valence and the conduction band was estimated. X‐ray photoelectron spectroscopy (XPS) measurements of oxygen 1s‐ and titanium 2p‐binding energies confirmed the anodic shift of the band edges.

Bibliography

GÃ¤rtner, M., Dremov, V., MÃ¼ller, P., & Kisch, H. (2005). Bandgap Widening of Titania through Semiconductor Support Interactions. ChemPhysChem, 6(4), 714â718. Portico.

Authors 4

Marc Gärtner (first)
Viatcheslav Dremov (additional)
Paul Müller (additional)
Horst Kisch (additional)

References 25 Referenced 64

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Dates

Type	When
Created	20 years, 5 months ago (March 14, 2005, 6:47 p.m.)
Deposited	1 year, 10 months ago (Oct. 9, 2023, 11:58 p.m.)
Indexed	1 year, 1 month ago (July 22, 2024, 5:57 p.m.)
Issued	20 years, 4 months ago (April 11, 2005)
Published	20 years, 4 months ago (April 11, 2005)
Published Online	20 years, 4 months ago (April 11, 2005)
Published Print	20 years, 4 months ago (April 15, 2005)

Funders 0

None

BibTeX

@article{G_rtner_2005, title={Bandgap Widening of Titania through Semiconductor Support Interactions}, volume={6}, ISSN={1439-7641}, url={http://dx.doi.org/10.1002/cphc.200400185}, DOI={10.1002/cphc.200400185}, number={4}, journal={ChemPhysChem}, publisher={Wiley}, author={Gärtner, Marc and Dremov, Viatcheslav and Müller, Paul and Kisch, Horst}, year={2005}, month=apr, pages={714–718} }

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