| H_2O_2-Promoted Size Growth of Sulfated TiO_2 Nanocrystals |
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| 作者单位： | State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences，State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences，State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences，State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences，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，Fuzhou Fujian 350002 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China，Fuzhou Fujian 350002 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China，Fuzhou Fujian 350002 China，Fuzhou Fujian 350002 China |
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| 基金项目： | 国家自然科学基金，Science and Technology Program from Fujian Province，Hundreds Youth Talents Program of CAS (LiGS) |
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| 摘 要： | Anatase nanoparticles modified by sulfate groups were synthesized using hydrothermal 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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| 关 键 词： | 水热合成 取代反应 粒子生长 显微结构 硫酸盐 氧化钛 纳米晶体 |
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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| Institution: | 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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