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采用热蒸发SnO粉末制备了多分支SnO2纳米线节点。采用透射电镜和场发射扫描电镜研究了其纳米结构。结果表明:Sn纳米粒子来自于SnO粉末分解,并作为自催化剂控制SnO2纳米线节点的生长;斜方晶相是替代金红石相而成为SnO2在生长过程中的主要晶相,通过电子衍射和高分辨电镜观察,SnO2纳米线的枝叶和枝干是外延生长方式,生长取向沿着斜方[110]和[110-]。提出了SnO2纳米线节点的自催化气-液-固生长机制。
Multi-branched SnO2 nanowire nodes were prepared by thermal evaporation of SnO powder. The nanostructures were studied by transmission electron microscopy and field emission scanning electron microscopy. The results show that the Sn nanoparticles come from the decomposition of SnO powder and act as autocatalyst to control the growth of SnO2 nanowire nodes. The orthorhombic phase is the main crystal phase of SnO2 instead of rutile phase. Through the electron diffraction and high resolution Electron microscopy showed that the branches and branches of SnO2 nanowires were epitaxially grown along the rhombic [110] and [110-] directions. The autocatalytic gas-liquid-solid growth mechanism of SnO2 nanowire nodes is proposed.