水热法一步合成β-MnO_2纳米线束

One-step Synthesis of β-MnO_2 Nanowire Bundles by Hydrothermal Process

以商业γ-MnO2粉末作为反应前驱物,水热法一步合成了由β-MnO2组装而成的纳米线束。所制备的样品用X射线粉末衍射(XRD)、透射电子显微镜(TEM)、电子衍射(ED)、场发射扫描电子显微镜(FESEM)等测试手段进行了表征。结果表明,所制备样品为纯相四方晶型的单晶β-MnO2纳米线束,直径约20～30nm,长达数微米到数十微米。对β-MnO2纳米线束的形成机理进行了探讨,认为由商业γ-MnO2粉末水热合成β-MnO2纳米线束的过程,是一典型的固体—溶液—固体转变过程,其中包含了Ostwald熟化过程。

β- MnO2 nanowire clusters are synthesized simply by the one -step hydrothermal process with commercial β - MnO2 powders as precursor. The product is investigated by a variety of techniques, including X - ray powder diffraction （ XRD）, transmission electron microscopy （ TEM ）, electronic diffraction （ ED）, and field emission scanning electron microscopy （FESEM）. The results indicates that the prepared samples are all tetragnal structure in pure phase, and the single -crystallineβ -MnO2 nanowire bundles and diamefer about 20 - 30 nm and the length is several or ten micrometers. The formation mechanism of theβ- MnO2 nanowire bundles is considered to be a solid -solution -solid transition process containing Ostwald Ripening course.