Structural and magnetic properties of Ni-Pt nanoalloys supported on silica

被引：21

作者：

Benguedouar, Y. ^{[1
]}

Keghouche, N. ^{[1
]}

Belloni, J. ^{[2
]}

机构：

[1] UMC, Lab Microstruct & Defauts, Constantine 25000, Algeria

[2] ELYSE, UMR CNRS UPS 8000, Chim Phys Lab, F-91405 Orsay, France

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2012年 / 177卷 / 01期

关键词：

Nanoparticles; Ni3Pt; NiPt3; NiSi; Radiolysis; Magnetization; RADIATION-INDUCED SYNTHESIS; CLUSTERS; PD; ADSORPTION; CATALYSTS; GROWTH; RH; 4D;

D O I：

10.1016/j.mseb.2011.09.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bimetallic Ni-x%Pt/SiO2 nanoclusters at different initial platinum contents (x = 0, 2. 9, 15, 25, 35, 85 and 95 at %) are synthesized at room temperature by the radiolytic process. According to the Pt amount, the structural studies (XRD, TEM and SAED) reveal the presence after irradiation of NiSi and Ni3Pt or NiPt3 nanoalloyed clusters on amorphous silica. The Ni-Pt nanoparticles have a fcc solid solution structure and a narrow cluster size distribution. The radiation-induced nanoparticles exhibit an enhancement of the magnetization at low temperature. Moreover, unlike Ni-Pt bulk alloys, the magnetization increases with the Pt content. In the ultra divided state, platinum seems to play a major role by enhancing the nickel ion reduction and protecting Ni against corrosion during the synthesis. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：27 / 33

页数：7

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