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

Yi Hsin Ting, Chun Wei Huang, Akira Yasuhara, Sheng Yuan Chen, Jui Yuan Chen, Li Chang, Kuo Chang Lu*, Wen Wei Wu*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)1510-1516
Number of pages7
JournalNano Letters
Volume20
Issue number3
DOIs
StatePublished - 11 Mar 2019

Keywords

  • atomic arrangement
  • atomic-resolution STEM
  • MoO structure
  • pseudolamellar structure
  • tunnel structure

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