锗纳米针状结构的制备与表征

Preparation and Characterization of Ge Nanoneedles

以锗、二氧化锗为原料,铜片为沉积衬底,通过水热沉积过程制备出了锗纳米针状结构。采用扫描电子显微镜(SEM)、能量色散光谱(EDS)、透射电子显微镜(TEM)及高分辨透射电子显微镜(HRTEM)等检测手段对样品进行了分析与表征。结果表明,样品具有典型的针状特征,其长度大于10μm,由单晶锗和无定形锗氧化物外层所组成。运用金属催化气-液-固和氧化物辅助生长机理,解释了锗纳米针状结构的形成与生长。

Ge nanoneedles were prepared by hydrothermal deposition process using Ge and GeO2 as the starting materials and copper sheet as the deposition substrate. The Ge nanoneedle sample was characterized by scanning electron microscopy （SEM）, energy dispersive X-ray spectrum （EDS）, transmission electron microscopy （TEM） and high-resolution transmission electron microscopy （HRTEM）. The results demonstrate that the sample is of typical needle structure and composed of monocrystalline Ge and amorphous Ge oxide outer layer,and its length is more than 10 μm. Furthermore, the formation and growth of the Ge nanoneedle are explained by the mechanisms of metal-catalyzed vapor-liquid-solid and oxide-assisted growth.