Size- and temperature-dependent structural transitions in gold nanoparticles

被引：263

作者：

Koga, K

Ikeshoji, T

Sugawara, K

机构：

[1] Natl Inst Adv Ind Sci & Technol, Nanotechnol Res Inst, Tsukuba, Ibaraki 3058565, Japan

[2] Natl Inst Adv Ind Sci & Technol, Res Inst Computat Sci, Tsukuba, Ibaraki 3058568, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.92.115507

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Size- and temperature-dependent structural transitions in gold nanoparticles were revealed with morphology statistics obtained by high-resolution electron microscopic observations for thousands of particles annealed in a helium heat bath. We found that gold nanoparticles over a wide size range, 3-14 nm, undergo a structural transformation from icosahedral to decahedral morphology just below the melting points. It was also clarified that the formation of bulk crystalline structures from the decahedral morphology requires the melt-freeze process due to an insurmountable high free-energy barrier.

引用

页码：115507 / 1

页数：4

共 28 条

[1] Microscopic mechanisms of the growth of metastable silver icosahedra [J].