An in situ real-time x-ray diffraction study of phase segregation in Au-Pt nanoparticles

被引：24

作者：

Malis, O. ^{[2
]}

Radu, M. ^{[2
]}

Mott, D. ^{[1
]}

Wanjala, B. ^{[1
]}

Luo, J. ^{[1
]}

Zhong, C-J ^{[1
]}

机构：

[1] SUNY Binghamton, Dept Chem, Binghamton, NY 13902 USA

[2] SUNY Binghamton, Dept Phys, Binghamton, NY 13902 USA

来源：

NANOTECHNOLOGY | 2009年 / 20卷 / 24期

基金：

美国国家科学基金会;

关键词：

GOLD; STABILITY;

D O I：

10.1088/0957-4484/20/24/245708

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In situ real-time x-ray diffraction was used to study phase segregation and coarsening of Au-Pt nanoparticles supported on silica powder, and porous alumina membranes. Contrary to the expectations from the bulk phase diagram, silica supported Au-Pt nanoparticles have an alloyed structure that is preserved even after extensive annealing at temperatures as high at 700 degrees C. In stark contrast, alumina supported Au-Pt nanoparticles exhibit a rich phase behaviour that is sensitive to alloy composition and the details of the synthesis process. In particular, low-density as-prepared Au41Pt59 nanoparticles exhibit the signature of incipient phase segregation that develops into full phase separation during annealing at high temperature.

引用

页数：4