小丘
材料科学
Crystal(编程语言)
蚀刻(微加工)
透射电子显微镜
各向同性腐蚀
反应离子刻蚀
化学工程
纳米技术
复合材料
图层(电子)
计算机科学
工程类
程序设计语言
作者
Mei Sun,Byron M. Yu,Mengyu Hong,Zhiwei Li,Fengjiao Lyu,Xing Li,Zhihong Li,Xianlong Wei,Zheng Zhang,Qing Chen
出处
期刊:Small
[Wiley]
日期:2020-02-28
卷期号:16 (14)
被引量:8
标识
DOI:10.1002/smll.201906435
摘要
Abstract Special surface plays a crucial role in nature as well as in industry. Here, the surface morphology evolution of ZnO during wet etching is studied by in situ liquid cell transmission electron microscopy and ex situ wet chemical etching. Many hillocks are observed on the (000) O‐terminated surface of ZnO nano/micro belts during in situ etching. Nanoparticles on the apex of the hillocks are observed to be essential for the formation of the hillocks, providing direct experimental evidence of the micromasking mechanism. The surfaces of the hillocks are identified to be {01} crystal facets, which is different from the known fact that {01} crystal facets appear on the (000) O‐terminated surface of ZnO after wet chemical etching. O 2 plasma treatment is found to be the key factor for the appearance of {01} instead of {01} crystal facets after etching for both ZnO nano/micro belts and bulk materials. The synergistic effect of acidic etching and O‐rich surface caused by O 2 plasma treatment is proposed to be the cause of the appearance of {01} crystal facets. This method can be extended to control the surface morphology of other materials during wet chemical etching.
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