不同成分和结构的CoCu纳米线阵列的沉积规律

利用直流电化学沉积法通过调节沉积参数在多孔阳极氧化铝模板中沉积制备出了一系列不同成分和结构的磁性CoCu纳米线阵列.XRD和TEM的结果显示,沉积溶液的pH值对纳米线的成分比例和相结构的影响表现出了明显的规律性.笔者认为pH值对纳米线成分比例和相结构的控制主要源于它对溶液中Co^2＋沉积速率的影响.基于此沉积规律,沉积出了立方结构与六角结构共存的复相结构的CoCu纳米线.由于复相结构的CoCu纳米线中包含较多的相边界,因此它们具有远好于单相结构CoCu纳米线的磁性,其矫顽力和剩磁比均是单相结构纳米线的3倍.

The Deposition Rule of CoCu Composite Nanowire Arrays with Different Composition and Structure

A series of CoCu composite nanowire arrays with different composition and structure have been electrodeposited in the anodic aluminum oxide template. XRD and TEM results showed an apparent pH value rule for nanowire phase and composition. We believe that the pH value affected the deposition rate of Co^2＋ in the solution and then controlled the composition and structure of CoCu nanowires. Based on the deposition law, we prepared the composite CoCu nanowires in which the cubic and hexagonal structures coexisted. Because more phase boundaries have been existed in the composite CoCu nanowires, the specific magnetic properties, coercivity and squareness of the composite arrays are enhanced by three times, apparently preceding to those in single phase nanowires.