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- W2129648647 abstract "Anion-doped TiO2 have been investigated as photocatalysts that show excellent visible light response and delayed charge recombination. However, local site structure has not been reported yet. In this report, sulfur and/or nitrogen-doped TiO2 with uniform mesopores (2.9 nm) were synthesized and doped sulfur and nitrogen sites were studied using Ti and S K-edge XAFS. Mesoporous TiO2 was synthesized via the hydrolysis of Ti(i-PrO)4 in the presence of dodecylamine. Mesoporous S and/or N doped-TiO2 were synthesized by adding water to the mixture of Ti(i-PrO)4, dodecylamine, and urea/thiourea with molar ratio 2 : 1 : 1 (Meso N-TiO2 and Meso SN-TiO2) [1]. Separately, S-doped TiO2 were synthesized via chemical vapor deposition method with hydrogen sulfide at 583 or 623 K (S/meso TiO2-583 and 623). Ti and S K-edge XAFS spectra were measured at beamline 9C and 9A. Based on Ti K-edge EXAFS analyses, the bond distances for Meso N-TiO2 exhibited negligible change compared to those for Meso TiO2 (Table 1). In contrast, total coordination number N for Ti–O (or Ti–N) bonds effectively increased. This suggests a transition from unsaturated TiO4 to saturated octahedral TiO6–xNx. Similar saturation was also observed for S/meso TiO2-623. Ti–S bond distances were obtained at 2.40 – 2.44 A for S/meso TiO2-583 and -623 (Figure 1), based on Ti Kedge EXAFS curve-fit analyses. These distances were close to typical value 2.43 A for TiS2. The bond distance was shorter at 2.283 A for Meso SN-TiO2. The presence of substitutional S was demonstrated on the O sites of the TiO2 matrix. The peak positions of S K-edge XANES spectra for S-TiO2 in this report resembled those for TiS2 [1]." @default.
- W2129648647 created "2016-06-24" @default.
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- W2129648647 date "2009-01-01" @default.
- W2129648647 modified "2023-09-27" @default.
- W2129648647 title "Site Structure Analyses of Visible-Light Responsive Sulfur-Doped Titanium Oxide" @default.
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- W2129648647 hasPublicationYear "2009" @default.
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