Wang Huihu, Xie Changsheng, Zeng Dawen, Yang Zhihong
Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
J Colloid Interface Sci. 2006 May 15;297(2):570-7. doi: 10.1016/j.jcis.2005.10.059. Epub 2005 Dec 7.
ZnO complex nanostructure with special mushroom-like morphology was prepared by hydrolysis of zinc acetate dehydrate (Zn(CH3COO)2 2H2O) in water-methanol mixed solvent at 60 degrees C. The formation mechanism was studied using XRD investigation and FE-SEM observation, which showed that the mushroom-like particles were transformed from cauliflower-like layered basic zinc acetate (LBZA), Zn5(OH)8(CH3COO)22H2O, and composed of ZnO subunits with average size less than 10 nm. The introduction of hexamethylenetetramine (HMTA, C6H12N4) to the solution before deposition led to drastic changes in the morphologies of both aggregation particles and ZnO subunits. The novel ZnO microspheres, which were made of regular hexagonal plate-like ZnO with dimensional size 35 x 10 nm, were formed. These hexagonal plate-like ZnO subunits stacked very compactly and aligned regularly. Kinetic study of this unique complex nanostructure using TEM and FE-SEM observation showed the presence of HMTA played an important role on the formation of hexagonal ZnO subunits through different mechanisms related to the different parts of microspheres.
通过在60℃的水 - 甲醇混合溶剂中水解乙酸锌二水合物（Zn(CH₃COO)₂·2H₂O）制备了具有特殊蘑菇状形态的ZnO复合纳米结构。利用XRD研究和FE - SEM观察对其形成机理进行了研究，结果表明蘑菇状颗粒由菜花状层状碱式乙酸锌（LBZA），即Zn₅(OH)₈(CH₃COO)₂·2H₂O转变而来，且由平均尺寸小于10nm的ZnO亚基组成。在沉积前向溶液中引入六亚甲基四胺（HMTA，C₆H₁₂N₄）导致聚集颗粒和ZnO亚基的形态发生剧烈变化。形成了由尺寸为35×10nm的规则六边形板状ZnO构成的新型ZnO微球。这些六边形板状ZnO亚基紧密堆叠且排列规则。使用TEM和FE - SEM观察对这种独特的复合纳米结构进行动力学研究表明，HMTA的存在通过与微球不同部分相关的不同机制，对六边形ZnO亚基的形成起到了重要作用。
