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 language | English |
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Pages (from-to) | 8600-8603 |
Number of pages | 4 |
Journal | Journal of Physical Chemistry C |
Volume | 112 |
Issue number | 23 |
DOIs | |
Publication status | Published - Jun 12 2008 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films