Interfacial chemical bonding effect on the photocatalytic activity of TiO2-SiO2 nanocoupling systems |
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Authors: | Fujishima Musashi Takatori Hiroaki Tada Hiroaki |
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Affiliation: | Department of Applied Chemistry, School of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan. |
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Abstract: | TiO(2) nanoparticles (NPs) were deposited on the surfaces of SiO(2) microspheres with a mesoporous structure prepared by a hydrolysis-controlled sol-gel technique. The TiO(2) NPs were firmly combined on the surfaces of SiO(2) microspheres through the interfacial Si-O-Ti bonds. The coupling causes the bandgap widening up to 3.37 eV, enhancing the photocatalytic activity for the decomposition of acetaldehyde under illumination of UV-light (330 < λ < 400 nm). Density functional theory calculations for model clusters suggested that the observed results are derived from the lowering in the valence band edge energy with the interfacial bond formation. |
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