梭形β-FeOOH的控制合成

THE CONTROLLABLE SYNTHESIS OF SHUTTLE-LIKE β-FeOOH

采用简单的溶剂热法控制合成了梭形纳米β-FeOOH。研究通过TEM、XRD和SAED等手段表明,丙酮和水的比例对于纳米粒子的物相具有重要影响,当丙酮与水的体积比高于9∶14时,制备得到梭形的纳米β-FeOOH;反之则以棒、菱形形貌为主的α-Fe2O3。铁的前驱体浓度则对纳米粒子的大小及聚集状态产生重要影响,随着浓度的增加,β-FeOOH纳米粒子依次由小到大直至形成团聚体。通过控制反应条件,可以制备出长轴在170nm-860nm,短轴在50nm-220nm范围的可控大小的梭形、单晶结构纳米β-FeOOH。同时探讨了β-FeOOH的形成机理。

Shuttle-like β-FeOOH was controllably synthesized by a simple solvent hydrothermal treatment. Different from ordinary hydrothermal route, shuttle-like nano-β-FeOOH could be obtained through using the mixed solvent of acetone and water, while only spherical nanoparticles can be achieved by the aqueous solvent. The results demonstrated that the ratio between acetone and water is the primary factor affecting the shape： the shuttle-like nanoparticles can be synthesized only when the ratio is higher than 9：14; oppositely, the spherical nanoparticles. On the other hand, the concentration of Fe^3＋ has an important effect on the size of nanoparticles： when the concentration increased, the nanoparticles grew until aggregated. Under this experimental condition, it is controllable to synthesize shuttle-like, monocrystalline nano β-FeOOH with long axis at 170 nm-860 nm and short axis 50 nm-220 nm. The formation mechanism is also discussed.