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通过改变沉积液的pH值,在多孔阳极氧化铝(AAO)模板中用交流电化学沉积的方法制备出了不同晶体结构的钴纳米线阵列.当沉积溶液的pH值为2.5时,XRD图像表明钴纳米线阵列材料为面心立方结构(fcc);当pH值为3.0和3.5时,为面心立方(fcc)与六角密堆积(hcp)共存的结构;而当pH值为5.0时,则为六角密堆积(hcp)结构.磁测量结果表明这两种晶体结构的钴纳米线阵列具有不同的宏观磁性.在沿着纳米线长轴方向,面心立方(fcc)结构钴纳米线阵列的矫顽力比六角密堆积(hcp)结构的矫顽力高出约900×103/4pA·m-1,并且具有更高的矩形比.
The cobalt nanowire arrays with different crystal structures were prepared by alternating current electrochemical deposition in porous anodic alumina (AAO) templates by changing the pH of the deposition solution.When the pH of the deposition solution was 2.5, the XRD patterns showed that cobalt The nanowire arrays have a face-centered cubic (fcc) structure and coexist fcc and hcp at pH 3.0 and 3.5, respectively. When pH is 5.0, Hexagonal close-packed (hcp) structure.The magnetic measurements show that the two kinds of crystal structure of cobalt nanowire arrays have different macroscopic magnetic properties.With the direction of the long axis of the nanowires, the face centered cubic (fcc) structure of cobalt nanowire arrays The coercive force is about 900 × 103 / 4pA · m-1 higher than the hexagonal close-packed (hcp) structure, and has a higher squareness ratio.