Polyol-Mediated Synthesis of Hexagonal LaF3 Nanoplates Using NaNO3 as a Mineralizer

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• 作者：Ruifei Qin^† ; ^§ ; ; Hongwei Song*^‡ ; ; Guohui Pan^† ; ^§ ; ; Xue Bai^‡ ; ; Biao Dong^‡ ; ; Songhai Xie^<
• 刊名：Crystal Growth & Design
• 出版年：2009
• 出版时间：April 1, 2009
• 年：2009
• 卷：9
• 期：4
• 页码：1750-1756
• 全文大小：439K
• 年卷期：v.9,no.4(April 1, 2009)
• ISSN：1528-7505

文摘

Hexagonal LaF₃ nanoplates have been successfully prepared via a polyol-mediated route with ethylene glycol (EG) as solvent. NaNO₃, which was introduced into the reaction system as a mineralizer, played an important role in the formation process of these nanoplates. The size of the as-prepared nanoplates could be tuned by changing the NaNO₃ content and the NH₄F content. A possible formation mechanism of these nanoplates has been proposed. The effects of other alkali metal nitrates (LiNO₃, KNO₃, RbNO₃ and CsNO₃) and solvents (water, methanol, diethylene glycol, and glycerol) on the products have also been explored. The increased chemical potential caused by the addition of NaNO₃ in the reaction system made LaF₃ nanoplates formed initially unstable and transform into stable regular hexagonal LaF₃ nanoplates with a bigger size by a slow dissolution−recrystallization process.