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用化学气相输运(CVT)方法合成了直径在20～120nm呈单晶结构的ZnO纳米线.利用场发射扫描电 镜(FESEM)、高分辨透射电镜(HRTEM)以及选区电子衍射(SAED)等技术对ZnO纳米线的生长机理和结构进行 了系统研究,结果表明,纳米线的成核与Au Zn合金催化颗粒的饱和度有直接的关系,先饱和的颗粒上纳米线首 先成核.纳米线顶端合金颗粒组成的变化是导致纳米线生长终止的重要原因,大量纳米线的生长不是同时进行 的.本工作提供了支持纳米线气液固(V L S)生长机理的新实验证据,提出了氧化物纳米线的生长机理.
ZnO nanowires with diameter ranging from 20 to 120 nm were synthesized by the chemical vapor transport (CVT) method.FTIEM, HRTEM and SAED The growth mechanism and structure of ZnO nanowires were systematically studied. The results show that the nucleation of nanowires is directly related to the saturation of Au Zn alloy particles. The nanowires on the first saturated particles nucleate first. The change of the composition of the alloy particles is the main reason leading to the termination of the growth of the nanowires, and the growth of a large number of nanowires is not carried out at the same time.This work provides new experimental evidence to support the growth mechanism of the nanowire gas-liquid-solid (VLS) Line growth mechanism.