Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
Department of Physics, Tam Kang University, New Taipei 251, Taiwan.
Nanoscale. 2016 Sep 29;8(38):17039-17043. doi: 10.1039/c6nr01287f.
Metal oxide nanostructures have been investigated extensively due to their wide range of physical properties; zinc oxide is one of the most promising materials. It exhibits fascinating functional properties and various types of morphologies. In particular, ZnO heterostructures have attracted great attention because their performance can be modified and further improved by the addition of other materials. In this study, we successfully transformed ZnO nanowires (NWs) into multiple ZnO/AlO heterostructure NWs via a solid-state cation exchange reaction. The experiment was carried out in situ via an ultrahigh vacuum transmission electron microscope (UHV-TEM), which was equipped with a video recorder. Moreover, we analyzed the structure and composition of the heterostructure NWs by Cs-corrected STEM equipped with EDS. Based on these experimental results, we inferred a cation exchange reaction ion path model. Additionally, we investigated the defects that appeared after the cation reaction, which resulted from the remaining zinc ions. These multiple heterostructure ZnO/AlO NWs exhibited excellent UV sensing sensitivity and efficiency.
金属氧化物纳米结构由于其广泛的物理性质而受到广泛研究；氧化锌是最有前途的材料之一。它具有迷人的功能特性和各种形态。特别是，ZnO 异质结构引起了极大的关注，因为通过添加其他材料可以修改和进一步提高其性能。在这项研究中，我们通过固态阳离子交换反应成功地将 ZnO 纳米线（NWs）转化为多种 ZnO/AlO 异质结构 NWs。该实验是通过配备视频记录器的超高真空透射电子显微镜（UHV-TEM）原位进行的。此外，我们通过配备 EDS 的 Cs 校正 STEM 分析了异质结构 NWs 的结构和组成。基于这些实验结果，我们推断出阳离子交换反应离子路径模型。此外，我们研究了阳离子反应后出现的缺陷，这些缺陷是由剩余的锌离子引起的。这些多种异质结构 ZnO/AlO NWs 表现出优异的紫外感应灵敏度和效率。
