Onion-like graphitic particles produced from diamond

✍ Scribed by Lu-Chang Qin; Sumio Iijima

• Book ID: 103038551
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 538 KB
• Volume: 262
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)01037-8

✦ Synopsis

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 l07 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 electronbeam 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.