Manipulation of morphology and magnetic properties in cobalt nanowires
Manipulation of morphology and magnetic properties in cobalt nanowires
复制标题
钴纳米线形态和磁性能的调控
DOI：
10.1063/1.4977890
复制
发表时间：
2017-05-01
期刊：
影响因子：
1.6
通讯作者：
Liu, J. Ping
中科院分区：
文献类型：
--
作者：
Li, Chenglin;Wu, Qiong;Liu, J. Ping
采用溶剂热化学法，在1，2-丁二醇中还原钴的羧酸盐，合成了铁磁性金属钴纳米线。在此过程中，纳米晶体的尺寸和形状可以通过反应参数如表面活性剂比例、前体浓度和温度梯度来控制。合成的Co纳米晶呈现出有利于各向异性颗粒生长的六方密堆积相，（002）晶向沿着纳米线的长轴。通过改变催化剂浓度，系统研究了合成参数对控制50 ~ 700 nm不同长度Co纳米粒子的影响。磁性测量和透射电子显微镜的钴纳米线的图像表明，钴纳米线的磁性依赖于基本上的形态。所获得的最高折射率为8.4kOe，这归因于它们的小平均直径和200 - 300 nm的纳米线的高结晶度。
Ferromagnetic metallic Cobalt nanowires are synthesized by the reduction of carboxylate salts of Co in 1, 2-butanediol using a solvothermal chemical process. In this process, the size and shape of the nanocrystals can be controlled via reaction parameters such as surfactant ratio, precursor concentration, and the temperature ramp. Synthesized Co nanocrystals exhibit the hexagonally close-packed phase favored the growth of anisotropic particles and the (002) crystalline direction is along the long axis of the nanowires. By varying the catalyst concentration in proper range, the effect of synthetic parameters on controlling Co nanoparticles with different length of 50 - 700 nm was systematically studied. Magnetic measurements and TEM images of the Cobalt nanowires indicate that the coercivity of the Co nanowires depends substantially on the morphology. The obtained highest coercivity of 8.4 kOe can be attributed to their small mean diameter and high crystallinity of nanowires for 200 - 300 nm.