H2O2-Promoted Size Growth of Sulfated TiO2 Nanocrystals |
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| Authors: | YAN You-Jun QIU Xiao-Qing WANG Hui LI Li-Ping LI Guang-She |
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| Affiliation: | 1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002, China |
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| Abstract: | Anatase nanoparticles modified by sulfate groups were synthesized using hydrother- mal method. The particles were controlled to large sizes by simply adjusting the amount of H2O2, in which HOO- ions replaced the surface sulfate groups and reduced the steric effect to promote the grain growth. The size-induced microstructural changes of the as-prepared nanoparticles were characterized using powder XRD, FT-IR, TG, and UV-vis analyses. The sulfate groups existed on anatase surface in unidentate and bidentate coordination forms. With the particle size reduction, bandgap energies of the as-prepared anatase nanoparticles decreased, and the desorption temperature of sulfate groups shifted towards lower temperatures. |
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| Keywords: | hydrothermal synthesis nucleophilic substitution particle growth microstructure |
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