Preparation of hexagonal close-packed nickel nanoparticles via a thermal decomposition approach using nickel acetate tetrahydrate as a precursor
Preparation of hexagonal close-packed nickel nanoparticles via a thermal decomposition approach using nickel acetate tetrahydrate as a precursor
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DOI：
10.1016/j.jallcom.2008.09.117
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发表时间：
2009-05
影响因子：
6.2
通讯作者：
Xiaohua Luo;Yuanzhi Chen;G. Yue;D. Peng;Xuetao Luo
中科院分区：
文献类型：
--
作者：
Xiaohua Luo;Yuanzhi Chen;G. Yue;D. Peng;Xuetao Luo
以四水合醋酸镍为前驱体，采用热分解法制备了具有窄尺寸分布的六方密堆积（hcp）镍纳米颗粒。采用透射电子显微镜（TEM）、粉末X射线衍射仪（XRD）和振动样品磁强计（VSM）对样品的形貌、结构和磁性能进行了表征。结果表明，烷基膦表面活性剂可以控制产物的粒径和形状，调节油胺的浓度可以控制产物的晶相。低浓度的油胺有利于亚稳hcp晶相的形成。磁性测量表明，六方晶系镍纳米颗粒的磁性与面心立方（fcc）镍纳米颗粒的磁性有很大的不同。一个非常低的磁化强度已被观察到hcp镍纳米粒子。
Hexagonal close-packed (hcp) Ni nanoparticles with a highly narrow size distribution have been prepared via a thermal decomposition approach using nickel acetate tetrahydrate as a precursor. The particle morphology, microstructure and magnetic properties were characterized by using transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The results have shown that the particle size and shape can be controlled by using alkylphosphine surfactants, and the control of crystalline phase was achieved by adjusting the concentration of oleylamine in the reaction mixture. The formation of metastable hcp crystalline phase favors a low concentration of oleylamine. The magnetic measurements have shown that the magnetic properties of hcp Ni nanoparticles are quite different from those of face-centered cubic (fcc) Ni nanoparticles. A very low magnetization has been observed on hcp Ni nanoparticles.