Close-open-close evolution of holes at the tips of conical graphenes of single-wall carbon nanohorns

Jing Fan, Ryota Yuge, Jin Miyawaki, Takazumi Kawai, Sumio Iijima, Masako Yudasaka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We previously reported that holes opened at the tips of conical single-graphenes of single-wall carbon nanohorns were closed during heat treatment at 1200 °C in an argon atmosphere. Here, we report phenomena related to the behavior of these holes: the holes closed quickly at first, then reopened, and then slowly closed again as the heat treatment period increased. This close-open-close evolution occurred only when the initial hole size was medium (0.7-0.9 nm). Smaller and larger holes did not reopen after they thermally closed. We discuss the close-open-close mechanism by considering the functions of oxygenated groups existing at the edges of the holes.

Original languageEnglish
Pages (from-to)8600-8603
Number of pages4
JournalJournal of Physical Chemistry C
Volume112
Issue number23
DOIs
Publication statusPublished - Jun 12 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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