Self-limiting size distribution of supported cobalt nanoclusters at room temperature

被引：43

作者：

Gwo, S ^{[1
]}

Chou, CP

Wu, CL

Ye, YJ

Tsai, SJ

Lin, WC

Lin, MT

机构：

[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan

[2] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.90.185506

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Formation of monodispersed Co nanoclusters on a single-crystal Si3N4 dielectric film at room temperature is reported. A remarkably narrow size distribution with the average size of similar to30 Co atoms has been obtained. We have confirmed that the average size of Co nanoclusters is independent of the Co coverage and the cluster areal density linearly proportions to the Co deposition amount even at high coverages. Also, we have found that Co nanoclusters deposited on Si3N4 are thermally stable with respect to cluster aggregation/coalescence. We propose that this novel phenomenon is a quantum size effect, manifested by local energy minima in the electronic shell structure of Co quantum dots.

引用

页数：4

共 28 条

[1] Structure determination of the Si3N4/Si(111)-(8 x 8) surface:: A combined study of Kikuchi electron holography, scanning tunneling microscopy, and ab initio calculations [J].