Self-assembled double ladder structure formed inside carbon nanotubes by encapsulation of H8Si8O12

Zheng Liu*, Soon Kil Joung, Toshiya Okazaki, Kazu Suenaga, Yoshiaki Hagiwara, Tetsu Ohsuna, Kazuyuki Kuroda, Sumio Iijima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Unique low-dimensional SiO2-based nanomaterials can be encapsulated and synthesized inside the nanometer-scale one-dimensional internal spaces of carbon nanotubes (CNTs). In this study, various singlewalled CNTs (SWNTs) and double-walled CNTs (DWNTs) having different diameters are used as containers for cubic octameric H8Si8O12 molecules. High-resolution transmission electron microscopy (HRTEM), Fourier transform infrared (FT-IR) spectroscopy, and Raman spectroscopy observations revealed that, depending on the diameter of the CNTs, two types of structures are formed inside the SWNTs and DWNTs: In the case of those CNTs having inner diameters ranging from 1.2 to 1.4 nm, a new ordered self-assembled structure composed of H8Si4bO8n-4 molecules was formed through the transformation of H8Si8O12; however, in the case of CNTs having inner diameters larger than 1.7 nm, a disordered structure was formed. This behavior may indicate that strong interactions occur between the CNTs and the encapsulated H8Si4nO8a-4 molecules.

Original languageEnglish
Pages (from-to)1160-1166
Number of pages7
JournalACS Nano
Issue number5
Publication statusPublished - 2009 May 26
Externally publishedYes


  • Carbon nanotubes
  • Double ladder structure
  • Electron microscopy
  • Octahydridosilsesquioxane
  • Structure evaluation

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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