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以纯锌粉作为原料,用气相输运法在650℃合成了ZnO双晶纳米梳结构,并用高分辨透射电镜及选区电子衍射等方法对其微观结构进行了研究.结果表明双晶纳米梳两侧的齿针呈一定角度以孪晶方式对称生长,其孪晶面为(11-3),两侧齿针都垂直于孪晶界,其直径均匀分布在50—100nm,每一侧梳背和齿针的生长方向均分别为〈01-10〉和〈0001〉.由于孪晶造成了晶体取向的变化,基于镜像对称的特征,ZnO双晶纳米梳两侧梳背的外缘可以均为Zn终结的(0001)面,因此都可以发生自催化作用并形成分支结构,这种纳米结构的生长过程与王中林等人提出的极性生长机理相符合.
Pure zinc powder was used as raw material to synthesize ZnO nanocrystal nanostructures at 650 ℃ by gas phase transport method.The microstructure was characterized by high-resolution transmission electron microscopy and selected area electron diffraction.The results show that both sides Of the needle at an angle to twins symmetrical growth, the twin surface (11-3), both sides of the needle are perpendicular to the twin boundaries, and its diameter evenly distributed in the 50-100nm, each side comb back and The growth direction of the tooth needles are respectively <01-10> and <0001>. Due to the crystal orientation induced by the twins, based on the mirror symmetry, the outer edges of the comb backs on both sides of ZnO nanocrystals can all be Zn End (0001) plane, so they can autocatalytic and form a branched structure, the growth of this nanostructures and Wang Zhonglin et al proposed polar growth mechanism is consistent.