摘要
使用强碱氢氧化钾为沉淀剂,通过水热法成功合成了具有六角形貌的过渡金属氢氧化物Ni(OH)2及Co(OH)2片状纳米晶。利用X射线粉末衍射仪和透射电子显微镜对样品的结构和形貌进行了表征。透射电镜观察结果显示:Ni(OH)2相为规则六角纳米片,Co(OH)2相为纳米片和纳米棒的混合物。选区衍射结果指出:Ni(OH)2及Co(OH)2纳米晶体均为单晶体。Ni(OH)2及Co(OH)2纳米片的产率分别达到了70%和90%。将实验结果同前人的过渡族金属氢氧化物纳米片报道进行了比较,提出了一个新的片状纳米晶的形成机制,指出在正常的沉淀条件下,Ni(OH)2及Co(OH)2纳米晶的稳定形貌总为六角片状。
Transition metal hydroxides Ni （OH）2 and Co （OH）2 nano-sheet crystals with hexagonal morphology have been successfully synthesized through hydrothermal method using strong alkali （KOH） as precipitator. The structure and morphology of the as-prepared samples were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. TEM observations exhibit that the Co（OH）2 phase is formed with the regular hexangular nano-sheets, while Ni（ OH）2 phase a mixture of nano-sheets and nano-rods. Selected area electron diffraction （SAED） patterns reveal the single crystalline nature of the entire nano-sheet. The yields of the nano-sheets for Ni（OH）2 and Co（OH）2 reach about 70% and 90%, respectively. It is proposed that hexagonal sheet is a stable crystalline morphology for the current solid compounds under normal precipitation conditions.Comparing with the previous reports on synthesis of transition metal hydroxide nano-sheet by the other methods, a new formation mechanism of nano-sheets has been discussed.
出处
《电子显微学报》
CAS
CSCD
2005年第5期460-463,共4页
Journal of Chinese Electron Microscopy Society
基金
Natural Science Foundation of Fujian Province China(No.A0320001),the Ministry of Science and Technology of China(No.2003BA323C),andthe State Key Laboratory of Structural Chemistry of China(No.050005).
