High-temperature formation of concentric fullerene-like structures within foam-like carbon: Experiment and molecular dynamics simulation

被引：49

作者：

Lau, D. W. M.

McCulloch, D. G.

Marks, N. A.

Madsen, N. R.

Rode, A. V.

机构：

[1] RMIT Technol, Sch Appl Sci, Melbourne, Vic 3001, Australia

[2] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia

[3] Australian Natl Univ, Laser Phys Ctr, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.75.233408

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The formation mechanism of carbon onions is investigated. The microstructure of onions formed using pulsed-laser deposition is found to depend critically on the background gas pressure. Molecular dynamics simulations show that an optimal annealing temperature of 4000 K is required to form well-ordered onions (concentric fullerene-like spheres), in agreement with experiment. The onions form from the outer layer first, and a model is presented in which the background pressure must be sufficient to allow atoms to cluster, yet low enough to allow annealing into well-ordered onions.

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页数：4

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