ZnO/SnO2 hierarchical and flower-like nanostructures: facile synthesis, formation mechanism, and optical and magnetic properties
ZnO/SnO2 hierarchical and flower-like nanostructures: facile synthesis, formation mechanism, and optical and magnetic properties
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ZnO/SnO2 多级花状纳米结构：易于合成、形成机制以及光学和磁性
DOI：
10.1039/c2ce06296h
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发表时间：
2012-01-01
期刊：
影响因子：
3.1
通讯作者：
Tong, Ye-Xiang
中科院分区：
文献类型：
--
作者：
Liu, Zhao-Qing;Ding, Liang-Xin;Tong, Ye-Xiang
通过电沉积(用于氧化锌纳米棒阵列)和水热生长(用于二氧化锡)成功地制备了具有氧化锌骨架和SnO2分支的层状和花状纳米结构。SnO2纳米棒在氧化锌纳米棒的侧面外延生长。通过改变反应时间，可以调整纳米结构的形貌和比表面积。用扫描电子显微镜、透射电子显微镜、X射线衍射仪、X射线光电子能谱、紫外-可见光谱和加速比表面积及孔隙率测定仪(ASAP 20M)对所制备的纳米结构进行了表征。基于一系列随时间变化的实验，提出了这种杂化纳米结构的可能形成过程和生长机制。与原始的氧化锌纳米棒相比，紫外光发射显示出增强的近禁带发射。此外，还研究了层次化的ZnO/SnO2纳米结构的磁性。
Hierarchical and flower-like nanostructures with ZnO backbones and SnO2 branches were successfully prepared by electrodeposition (for ZnO nanorod arrays) and hydrothermal growth (for SnO2). The SnO2 nanorods grew epitaxially on the sides of ZnO nanorods. The morphologies and surface areas of ZnO/SnO2 hierarchical nanostructures can be tailored by changing the reaction time. Such hybrid ZnO/SnO2 nanostructures were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectrophotometry and by using an accelerated surface area and porosimetry system (ASAP 2020M). A possible formation process and growth mechanisms for such hybrid ZnO/SnO2 nanostructures has been proposed based on series of time-dependent experiments. The UV properties show an enhanced as near-band gap emission compared with the primary ZnO nanorods. In addition, the magnetic properties of hierarchical ZnO/SnO2 nanostructures were also studied.