Atomic-scale structural identification and evolution of Co-W-C ternary SWCNT catalytic nanoparticles: High-resolution STEM imaging on SiO 2

Abstract : Recently, W-based catalysts have provided a promising route to synthesize single-walled carbon nanotubes (SWCNTs) with specific chirality, but the mechanism of the growth selectivity is vaguely understood. We propose a strategy to identify the atomic structure as well as the structure evolution of the CoW -C ternary SWCNT catalyst. The key is to use a thin SiO 2 film as the catalyst support and observation window. As the catalyst is uniformly prepared on this SiO 2 film and directly used for the SWCNT synthesis, this method has an advantage over conventional methods: it creates an opportunity to obtain original, statistical, and dynamic understanding of the catalyst. As a technique, atomic-scale imaging directly on SiO 2 serves as a powerful and versatile tool to investigate nanocrystals and high-temperature reactions; for the synthesis of SWCNTs, this work successfully visualizes the structure and evolution of the catalyst and illuminates the possible nucleation sites of the chirality-specific growth.
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Hua An, Akihito Kumamoto, Rong Xiang, Taiki Inoue, Keigo Otsuka, et al.. Atomic-scale structural identification and evolution of Co-W-C ternary SWCNT catalytic nanoparticles: High-resolution STEM imaging on SiO 2. Science Advances , American Association for the Advancement of Science (AAAS), 2019, 5 (5), eaat9459 p. 1-8. ⟨10.1126/sciadv.aat9459⟩. ⟨hal-02293135⟩

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