Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation.
Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation.
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DOI：
10.1039/b9nr00302a
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发表时间：
2010-04
期刊：
影响因子：
6.7
通讯作者：
T. Yamauchi;Y. Tsukahara;T. Sakata;H. Mori;T. Yanagida;T. Kawai;Y. Wada
中科院分区：
文献类型：
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作者：
T. Yamauchi;Y. Tsukahara;T. Sakata;H. Mori;T. Yanagida;T. Kawai;Y. Wada
采用微波辐射下的一锅法，通过分子内还原Cu（2+）和Ni（2+）与长链胺配体的甲酸盐配合物，在极短的时间内成功制备了面心立方（fcc）Cu-Ni（核-壳）纳米粒子。通过HAADF-STEM技术的观察表明，在一个颗粒中的纳米结构由富Ni壳和富Cu核组成。Cu（4）Ni（6）纳米粒子的平均粒径为11.7 nm，由直径约为1.5 nm的Cu核组成。6.0 nm，Ni壳层约为0.015 nm，Ni壳层约为0.015 nm。1.6在Cu核和Ni壳之间存在0.9nm厚的Cu-Ni混合合金夹层。Cu-Ni纳米颗粒中Cu：Ni的摩尔比对氧化性能和磁性能都有显著影响。Cu（3）Ni（7）和Cu（4）Ni（6）由反磁性富Cu核、铁磁性富Ni壳和反铁磁性富NiO层组成，其磁化强度分别为209和143 Oe。
We successfully prepared face-centered cubic (fcc) Cu-Ni (core-shell) nanoparticles by intramolecular reduction of formate complexes of Cu(2+) and Ni(2+) with long-chain amine ligands in a one-pot reaction within an extremely short time realized only under microwave irradiation. Observation by an HAADF-STEM technique showed that the nanostructure in one particle consisted of a Ni-rich shell and a Cu-rich core. Cu(4)Ni(6) nanoparticles with an average size of 11.7 nm were comprised of a Cu core with a diameter of ca. 6.0 nm, a Ni shell ca. 1.6 nm thick and a 0.9 nm thick interlayer of mixed Cu-Ni alloy between the Cu core and the Ni shell. Both the oxidation characteristics and the magnetic properties were dramatically affected by the molar ratios of Cu : Ni in the Cu-Ni nanoparticles. The magnetization of Cu(3)Ni(7) and Cu(4)Ni(6) comprised of a diamagnetic Cu-rich core, ferromagnetic Ni-rich shell and antiferromagnetic NiO-rich layer on the particle surface showed an exchange bias (209 and 143 Oe, respectively).