Engineering Magnetic Properties of Ni Nanoparticles by Non-Magnetic Cores

被引:60
作者
Zhang, HaiTao [1 ]
Ding, Jun [1 ]
Chow, GanMoog [1 ]
Ran, Min [1 ]
Yi, JiaBao [1 ]
机构
[1] Natl Univ Singapore, Dept Mat Sci & Engn, Fac Engn, Singapore 117574, Singapore
关键词
NICKEL NANOPARTICLES; STRUCTURAL-CHARACTERIZATION; SILVER NANOPARTICLES; POLYOL PROCESS; DECOMPOSITION; ENCAPSULATION; PARTICLES; NANORODS; SIZES; SHAPE;
D O I
10.1021/cm902114d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This work focuses on the magnetism-control study of nickel (Ni) nanoparticles (NPs) with non-magnetic cores of noble metals (M = Ag, Au). Monodispersed M NPs used as templates were synthesized by reducing their salt with a weak reductant-oleylamine (OA). The OA acted as surfactant and non-coordinating, reagent in the preparation of Ni NPs with a narrow size distribution. Then Ni atoms were controlled to grow upon the M NPs by controlling the decomposition of nickel acetylacetonate in OA. The as-prepared M and core/shell M/Ni NPs exhibit spherical shape, as characterized by transmission electron microscopy. The systematic study indicated that the Ni shell exhibits face-centered cubic crystal structure and is relatively stable in air. The hydrophobic OA molecules on the surface could be exchanged by hydrophilic imidazole to make the samples water-soluble. Magnetic study of core/shell NPs indicated that their blocking temperatures could be tuned by modulating either core size or shell thickness The novel magnetic properties of the core/shell structured NPs are introduced by the size effect, exchange interaction, and reduced magnetic ordering. The novel core/shell M/Ni NPs are expected to have a significant potential for biomolecule separation, magnetic imaging, and optoelectronics.
引用
收藏
页码:5222 / 5228
页数:7
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