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One-dimensional hetero-nanotube structure analysis by non-destructive TEM observation

  • Tokyo Universitya・JEOL Ltd.b
  • Xiang Ronga・ Akihito Kumamotob・ Shigeo Maruyamaa
  • Supporters: Hiroyuki Oshikawa, Yuichi Ikuhara

Si/SiO fabricated by MEMS processing2 Using a TEM grid as a substrate for CNT synthesis, we clarified the structure of Co-WC catalyst nanoparticles capable of chirality-selective growth of single-walled CNTs on a silicon oxide film by non-destructive TEM observation.This research method has accelerated the development of novel nanomaterials that require both synthesis and microstructural analysis, and has led to the creation of one-dimensional heteronanotubes.By applying non-destructive TEM observation, the innermost layer is a single-walled CNT, the outer multiple layers are a boron nitride nanotube, and the surrounding MoS2We also succeeded in synthesizing a heterostructure composed of three kinds of nanotubes.Since such one-dimensional structures have unique curvature effects and quantum confinement effects, they are expected to be developed in basic research as new materials.The results of this research were commended as “outstanding utilization results” in FY3.
H. An, et al., Sci. Adv. 5, eaat9459 (2019).
R. Xiang, et al., Science 367, 537 (2020).

One-dimensional hetero-nanotube structure analysis by non-destructive TEM observation
figure. (a) Si/SiO2 Schematic of the TEM grid. (b) Atomic resolution HAADF-STEM image and STEM-EDS mapping of Co-WC catalytic nanoparticles. (c) Schematic of a one-dimensional van der Waals heterostructure. (d) Elemental mapping image by electron energy loss spectroscopy.