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

Research output: Contribution to journalArticlepeer-review

25 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


  • 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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