4.8 Article

Atomic Imaging of Molybdenum Oxide Nanowires with Unique and Complex Periodicity by Advanced Electron Microscopy

期刊

NANO LETTERS
卷 20, 期 3, 页码 1510-1516

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03510

关键词

Mo5O14 structure; atomic-resolution STEM; tunnel structure; pseudolamellar structure; atomic arrangement

资金

  1. Ministry of Science and Technology (MOST) in Taiwan [MOST 103-2221-E-009-222-MY3, MOST 106-2628-E-009-002-MY3, MOST 106-2119-M-009-008]
  2. Center for Semiconductor Technology Research at National Chiao Tung University
  3. Frontier Research Center on Fundamental and Applied Sciences of Matters at National Tsing Hua University
  4. Featured Areas Research Center Program within the framework of the Higher Education Sprout Project, Ministry of Education (MOE) in Taiwan [MOST-108-3017-F-009-003]
  5. Ministry of Science and Technology of Taiwan [MOST 105-2628E-006-002-MY3, MOST 108-2221-E-006-139-MY3]

向作者/读者索取更多资源

Crystalline Mo5O14 exhibits distinctive structural features such as tunnel structure and pseudolamellar arrangement according to the ideal model. However, the spatial resolution of the conventional technique of transmission electron microscopy (TEM) is insufficient to distinguish the actual positions of atoms. In this work, we aimed to systematically analyze and identify the Mo5O14 nanowires fabricated by the chemical vapor deposition (CVD) process. Utilizing high-angle annular dark-field (HAADF), annular bright-field (ABF), and enhanced annular bright-field (E-ABF) within the scanning transmission electron microscope (STEM) mode reveals the structural features at the atomic scale. In addition, the ultrahigh resolution images have confirmed the crystallographic insights in [001] growth direction for the Mo5O14 nanowires with a tunnel structure throughout the nanowire. The cross-sectional images show the unique close-packed plane and atomic arrangement with a network of MoO6 octahedra and MoO7 pentagonal bipyramids. These results are consistent with the theoretical atomic arrangement, supporting the realization of Mo5O14-type catalysts used in the selective oxidation process and battery applications.

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