Onion-like graphitic particles produced from diamond

被引：43

作者：

Qin, LC

Iijima, S

机构：

[1] NEC Corporation, Fundamental Research Laboratories, Tsukuba, Ibaraki 305

来源：

CHEMICAL PHYSICS LETTERS | 1996年 / 262卷 / 3-4期

关键词：

D O I：

10.1016/0009-2614(96)01037-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Onion-like particles composed of concentric spherical graphitic shells have been obtained by irradiating diamond crystals with 200 keV electrons. The onion-like structures were found to be producible only in intense electron beams with an irradiation flux density of about 10(7) electrons/nm(2) s or greater. The genesis of this nanostructure of carbon was suggested to follow a three-step mechanism comprising displacements, migration, and aggregation. Electrical charging and electron-beam enhanced diffusion are proposed to be central to the high rate formation. The atomic evolution in diamond-graphite transformation is also discussed in connection with a recently reported model.

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收藏

页码：252 / 258

页数：7

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