Shape and Size Controlled Synthesis of Anatase Nanocrystals with the Assistance of Ionic Liquid

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• 作者：Kunlun Ding ; Zhenjiang Miao ; Baoji Hu ; Guimin An ; Zhenyu Sun ; Buxing Han ; Zhimin Liu
• 刊名：Langmuir
• 出版年：2010
• 出版时间：April 6, 2010
• 年：2010
• 卷：26
• 期：7
• 页码：5129-5134
• 全文大小：1134K
• 年卷期：v.26,no.7(April 6, 2010)
• ISSN：1520-5827

文摘

We report an ionic liquid (IL) assisted hydrothermal method to synthesize anatase TiO₂ nanocrystals (NCs), in which TiCl₄ was used as precursor, 1-butyl-3-methylimidazolium chloride (bmim⁺Cl⁻) as IL, and F⁻ or SO₄^2- ions as phase transformation inhibitor. The surfactant-like nature of IL was found to play a key role in controlling the crystallization process via controlling the aggregation manner of the NCs. The fine-tuning abilities of the operating parameters of the bmim⁺Cl⁻/TiCl₄/H₂O system facilitated the controlling over the shape and size of TiO₂ NCs. Phase-pure anatase monodisperse NCs with various shape and size were controllably obtained. Moreover, the aggregation manners of anatase NCs were also studied, and it was demonstrated that the high concentration of HF or H₂SO₄ could result in aggregation of anatase NCs to form pseudo single crystals.