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Surface properties of Ta2O5 layers prepared on SBA-15

Paper ID Volume ID Publish Year Pages File Format Full-Text
55175 47042 2012 6 PDF Available
Title
Surface properties of Ta2O5 layers prepared on SBA-15
Abstract

Ta2O5 layer was prepared onto SBA-15 (Ta2O5/SBA-5) with Ta ethoxide precursor. The surface properties of Ta2O5/SBA-5 was the same as those of mesoporous Ta2O5, possessing electron accepting sites and hydrophobicity, but the structural stability upon thermal treatment was improved due to the presence of SBA-5. The drastic blue shift in UV–vis absorption band was observed when the phase of Ta2O5 became thinner. Accordingly, band gaps of Ta2O5 samples increased from 4.0 (nonporous Ta2O5) to 4.3 eV (mesoporous Ta2O5, 2.3 nm wall thickness), and further increased to 4.9 eV for thin-layered Ta2O5/SBA-5 (0.5 nm Ta2O5 layer). Thus, stable activity for photocatalytic water decomposition was not observed over thin-layered Ta2O5/SBA-5.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (208 K)Download as PowerPoint slideHighlights► We prepared thin Ta2O5 layer on SBA-15. ► Surface properties of Ta2O5/SBA-15 were the same as those of mesoporous Ta2O5. ► Selective adsorption of a dye was observed. ► Thin layer caused extreme blue shift of UV–vis absorption of Ta2O5 with a wide band gap (5.0 eV).

Keywords
Ta2O5; Mesoporous materials; SBA-15; UV–vis absorption; Adsorption
First Page Preview
Surface properties of Ta2O5 layers prepared on SBA-15
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 192, Issue 1, 30 September 2012, Pages 197–202
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis