水热法生长棒状MnOOH和MnO_2晶体

Hydrothermal Growth of Rod-like MnOOH and MnO_2 Crystals

以高锰酸钾(KMnO4)和硫酸铵((NH4)2SO4)为主要原料,在150℃反应16h,水热法生长了棒状MnOOH晶体,然后以合成的棒状MnOOH晶体为前驱物,在硫酸溶液中,130℃水热反应12h,生长了棒状MnO2晶体。探索了KMnO4和(NH4)2SO4的用量以及反应温度对合成棒状MnOOH晶体的影响。利用X射线粉末衍射(XRD)、透射电子显微镜(TEM)和选区电子衍射等(SAED)等手段对产物进行了表征。结果表明,产物MnOOH为单斜结构的纯相,呈现棒状形貌,其平均直径约为72nm,长度近9.2μm,显示单晶特性;产物MnO2为四方结构的纯相,呈现棒状形貌,其平均直径约为83nm,长度达11μm,显示单晶特性。

MnOOH single-crystal rods were synthesized by hydrothermal method KMnO4 and （NH4）2SO4 as main raw materials, and the rod-like MnO2 crystals for 12h by a hydrothermal process, using the as-prepared MnOOH crystals as a at 150℃ for 16h, using were prepared at 130℃ precursor. The effects of amount of reactants and reaction temperature on the products were investigated. The as-prepared samples were characterized by X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, and selected area electron diffraction pattern （SAED）. The effects of both molar ratios between reactants and reaction temperature on the products were investigated. The results showed that the as-prepared MnOOH is a monoclinic single phase, displaying rod-like morphology, its average diameters are 72 nm, length up to 9.2 p,m, and exhibiting single crystalline nature. The as-prepared MnO2 is a tetragonal single phase, displaying rod-like morphology, its average diameters are 83 nm, length up to 11 p,m, and exhibiting single crystalline nature.