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采用直流电沉积的方法,在多孔氧化铝(AAO)模板中沉积得到了高度有序的Ni纳米管/线以及Ni/Nd皮芯结构磁性纳米阵列。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和能谱分析(EDX)对得到的样品进行了结构、形貌以及成分方面的表征。SEM测试表明,所得Ni和Ni/Nd的一维纳米阵列排列规整,直径与AAO孔径相当,且Ni/Nd合金形成了明显的皮芯结构。从Ni/Nd合金的截面还可以看到明显的六方结构,这与Nd的六方晶胞结构一致。另外,相同沉积Ni时间的Ni/Nd合金和Ni纳米阵列的形貌变化证明了Nd的存在,也就是稀土Nd成功沉积的结果。而电子能谱结果也同时证实了稀土Nd的存在。TEM的测试结果初步表征了纳米Ni的管状结构以及皮芯结构的形成过程。结合Ni和Ni/Nd的生长过程对一维纳米阵列的生长机制进行了初步的探讨,并认为一维纳米阵列的生长受多种因素的共同影响,最终形成的纳米结构取决于3个方向的竞争速率结果,并提出了3方向竞争机制。
By direct current deposition, highly ordered Ni nanotubes / wires and Ni / Nd core-shell magnetic nano-arrays were deposited in porous alumina (AAO) templates. The obtained samples were characterized by SEM, TEM and EDX. The SEM results show that the obtained one-dimensional nano-arrays of Ni and Ni / Nd are arranged regularly, the diameter is equivalent to that of AAO, and the Ni / Nd alloy forms a distinct core-shell structure. The obvious hexagonal structure can also be seen from the cross section of Ni / Nd alloy, which is consistent with the hexagonal unit cell structure of Nd. In addition, the morphologies of Ni / Nd alloys and Ni nanoarrays with the same deposition time of Ni demonstrate the existence of Nd, which is the result of the successful deposition of Nd. The electron spectroscopy results also confirmed the existence of rare earth Nd. TEM test results initially characterize the nano-Ni tubular structure and skin core structure formation process. The growth mechanism of one-dimensional nano-array was preliminarily discussed in combination with the growth process of Ni and Ni / Nd. The growth of one-dimensional nano-array was considered to be influenced by many factors. The final nanostructure was determined by three directions Competition rate results, and proposed a three-way competition mechanism.