【摘要】 用聚乙二醇-20000(PEG-20000),聚乙二醇-20000/环己烷为添加剂,以不同碱度的Zn(OH)42-和Zn(NH3)42+为前驱体,在200℃的水热条件下反应4h,经洗涤、干燥处理后,得到ZnO微晶粉体.产物用全自动X射线衍射仪(XRD)进行物相分析、扫描电子显微镜(SEM)和透射电子显微镜(TEM)观测ZnO形貌和大小.结果表明,生成的产物属于六方晶相,是由纳米棒状单晶组成的ZnO花状集合体,组成集合体的单晶在不同反应环境中成长为粗壮、尖细、成簇等不同形貌.0.5~4.0μm的集合体可控制制备.ZnO集合体不是个体的简单聚集,而是由单晶分枝组成,单晶生长取向为c轴正向,各单晶以一柱状单晶中部为基准类同心生长.研究结果对制备形貌可控的金属氧化物具有一定的参考价值.更多还原

【Abstract】 PEG-20000, PEG-20000/hexahydrobenzene were used as additives, different alkalinities of Zn(OH)42 or Zn(NH3)42+ as reaction precursors, reacting 4 h under hydrothermal condition 200℃, and ZnO crystallite powder could be obtained after washing and drying. The as-synthesized ZnO crystals were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the products belonged to hexagonal crystals. And the products were flowerlike ZnO aggregates composed of nano rodlike monocrystals. The monocrystals consisted of the aggregates grew to different morphologies such as robust, tapered and clustered under different reaction conditions. The aggregates could be synthesized controllably in the range of 0.5~4.0 μm. ZnO aggregates were not assembled by monocrystals simply, but consisted of monocrystal branches. The growing orientation of monocrystal was c axial positive direction. The monocrystals grew like-concentrically taking the middle section of a columnar monocrystal as the normal. The study results could provide a certain reference for synthesizing metal oxides with controlled morphology.更多还原