Unexpected high stiffness of Ag and Au nanoparticles

被引：101

作者：

Gu, Q. F. ^{[1
]}

Krauss, G. ^{[1
]}

Steurer, W. ^{[1
]}

Gramm, F. ^{[2
]}

Cervellino, A. ^{[3
,4
]}

机构：

[1] ETH, Dept Mat, Crystallog Lab, CH-8093 Zurich, Switzerland

[2] ETH, EMEZ, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[3] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.100.045502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We studied the compressibility of silver (10 nm) and gold (30 nm) nanoparticles, n-Ag and n-Au, suspended in a methanol-ethanol mixture by x-ray diffraction (XRD) with synchrotron radiation at pressures up to 30 GPa. Unexpectedly for that size, the nanoparticles show a significantly higher stiffness than the corresponding bulk materials. The bulk modulus of n-Au, K-0=290(8) GPa, shows an increase of ca. 60% and is in the order of W or Ir. The structural characterization of both kinds of nanoparticles by XRD and high-resolution electron microscopy identified polysynthetic domain twinning and lamellar defects as the main origin for the strong decrease in compressibility.

引用

页数：4

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