影像科学与光化学 ›› 2013, Vol. 31 ›› Issue (6): 440-447.DOI: 10.7517/j.issn.1674-0475.2013.06.440

• 研究论文 • 上一篇    下一篇

高度有序ZnO-SnO2异质外延枝状纳米结构的制备及其光催化性质研究

凌世婷, 佘广为, 穆丽璇, 师文生   

  1. 中国科学院 理化技术研究所 光化学转换与功能材料重点实验室, 北京 100190
  • 收稿日期:2013-08-26 修回日期:2013-09-24 出版日期:2013-11-15 发布日期:2013-11-15
  • 通讯作者: 师文生,E-mail:shiws@mail.ipc.ac.cn

Highly Ordered ZnO/SnO2 Heteroepitaxial Nanodendrites:Synthesis and Photocatalytic Applications

LING Shi-ting, SHE Guang-wei, MU Li-xuan, SHI Wen-sheng   

  1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2013-08-26 Revised:2013-09-24 Online:2013-11-15 Published:2013-11-15

摘要:

采用一种简单的热蒸发法制备了高度有序的ZnO-SnO2 异质外延枝状纳米结构。制备过程分两步进行:首先,在氧化铝片基底上制备SnO2纳米线;然后,以此SnO2纳米线为模板在其上生长ZnO纳米线。用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)等手段对产物的形貌、结构进行了表征。XRD表征结果证实第一步和第二步生长的产物分别为SnO2和ZnO。SEM观察结果表明,第一步热蒸发得到直径约100 nm、长度达几十微米的SnO2纳米线,第二步热蒸发后得到以第一步SnO2纳米线为主干、沿四个方向有序排列的枝状ZnO纳米结构。TEM观察结果表明,ZnO枝状纳米线沿[001]方向由SnO2纳米线(-101)晶面外延生长。所制备的枝状纳米结构由于具有巨大的比表面积,且外延异质结可以促进电荷的分离和快速转移,因此非常适合于光催化应用。该ZnO-SnO2 异质外延枝状纳米结构用于光催化降解甲基橙,表现出优异的性能。

关键词: 异质结, 枝状纳米结构, 外延, 光催化

Abstract:

Highly ordered ZnO-SnO2 hierarchical nanodendrites were synthesized via a simple two-step thermal evaporation method. The SnO2 nanowire trunks in the nanodendrites were first prepared on an alumina wafer and then used as template for the growth of the ZnO nanowire branches in the second step. Further investigation revealed that the ZnO branches with [001] direction are epitaxial grown from the (-101) crystal plane of the SnO2 trunks with a good lattice match. Due to the large specific surface areas as well as expedite paths for the transfer of electrons provided by the special structures, the nanodendrites exhibited an effective photocatalytic activity for the degradation of methyl orange.

Key words: heterostructure, nanodendrites, epitaxy, photocatalytic

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