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

doi:10.1021/jp800113w

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 journal › Article › peer-review

16 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 language	English
Pages (from-to)	8600-8603
Number of pages	4
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	23
DOIs	https://doi.org/10.1021/jp800113w
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

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10.1021/jp800113w

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

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.",

author = "Jing Fan and Ryota Yuge and Jin Miyawaki and Takazumi Kawai and Sumio Iijima and Masako Yudasaka",

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T1 - Close-open-close evolution of holes at the tips of conical graphenes of single-wall carbon nanohorns

AU - Fan, Jing

AU - Yuge, Ryota

AU - Miyawaki, Jin

AU - Kawai, Takazumi

AU - Iijima, Sumio

AU - Yudasaka, Masako

PY - 2008/6/12

Y1 - 2008/6/12

N2 - 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.

AB - 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.

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

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