论文部分内容阅读
实验基于非对称二次阳极氧化方法,通过在多种不同的电解液中交替阳极氧化制备了孔径大小调制的多孔氧化铝,并以此为模板,电化学沉积了线径调制的Ni纳米线。采用场发射扫描电镜对Ni纳米线进行了形貌表征,照片显示纳米线粗、细段的直径分别约为65和35 nm。X射线衍射分析结果表明Ni纳米线沿着<220>方向择优生长。采用综合物性测量系统测量了不同温度下纳米线阵列的磁滞回线。结果表明调制Ni纳米线的矫顽力随温度变化很小,其矫顽力主要取决于纳米线的形状各向异性。最后对Ni纳米线的反磁化过程进行了分析讨论。
Based on the asymmetric secondary anodic oxidation method, pore size modulated porous alumina was prepared by alternating anodic oxidation in a variety of different electrolytes. Electrochemical deposition of the diameter-modulated Ni nanowires was performed using this as a template. The morphology of Ni nanowires was characterized by field emission scanning electron microscopy. The photo shows that the nanowires are coarse and the diameters of the fine segments are about 65 and 35 nm, respectively. X-ray diffraction analysis showed that Ni nanowires preferentially grow along the <220> direction. The hysteresis loop of the nanowire arrays at different temperatures was measured by a comprehensive physical property measurement system. The results show that the coercivity of the prepared Ni nanowires varies little with temperature, and the coercive force mainly depends on the shape anisotropy of the nanowires. Finally, the anti-magnetization process of Ni nanowires is analyzed and discussed.