La-Fe纳米管阵列的电化学制备及其性能表征
发布时间：2018-12-06 13:22
【摘要】：纳米材料的可控制备与应用是目前纳米材料领域的研究重点,通过合理可调的制备工艺,能获得人为所需形貌、成分、结构、磁性能的纳米材料。本实验将基于多孔氧化铝模板(包括商业氧化铝滤膜和自制多孔阳极氧化铝模板)在水溶体系中采用电化学沉积法制备的La-Fe纳米管阵列,系统分析不同直流电位下的生长情况、形貌、结构及磁性能。研究发现,随着沉积电压的负向增大(从-1.05 V降低到-1.3 V),La-Fe纳米管有效长度先增后减,出现由沉积电位过大引起的覆盖式生长,La/Fe原子量比有所增加。样品系非晶结构,没有择优生长取向。纳米管样品在平行、垂直纳米管轴方向上的磁各向异性逐渐减弱,饱和磁化强度逐渐减小,越来越不容易被磁化。相比商业氧化铝模板中的La-Fe纳米管,自制氧化铝模板内得到的La-Fe纳米管有效解决了单根纳米管之间的融通现象,制备过程中调节开孔、扩孔时间可使AAO模板的孔径具备一定选择性。最后,对二次氧化法自制AAO模板流程及其生长机理进行简要陈述。
[Abstract]:The controllable preparation and application of nanomaterials is the focus of research in the field of nanomaterials at present. Through a reasonable and adjustable preparation process, the desired morphology, composition, structure and magnetic properties of nanomaterials can be obtained. In this study, La-Fe nanotube arrays were prepared by electrochemical deposition in aqueous solution system based on porous alumina templates (including commercial alumina filter membranes and self-made porous anodic alumina templates). The growth, morphology, structure and magnetic properties of different DC potential were systematically analyzed. It was found that with the increase of the deposition voltage (from -1.05 V to -1.3 V), La-Fe nanotubes), the effective length of nanotubes first increased and then decreased, resulting in overlying growth caused by excessive deposition potential. The atomic weight ratio of La/Fe has increased. The sample is amorphous and has no preferred growth orientation. The magnetic anisotropy of nanotube samples in parallel and perpendicular direction decreases gradually, and the saturation magnetization decreases gradually, so it is less and less easy to be magnetized. Compared with the La-Fe nanotubes in the commercial alumina template, the La-Fe nanotubes obtained from the self-made alumina templates can effectively solve the problem of single nanotubes, and adjust the opening during the preparation process. The pore size of AAO template can be selected by reaming time. Finally, the process and growth mechanism of AAO template made by second oxidation method were briefly described.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
本文编号：2366090
[Abstract]:The controllable preparation and application of nanomaterials is the focus of research in the field of nanomaterials at present. Through a reasonable and adjustable preparation process, the desired morphology, composition, structure and magnetic properties of nanomaterials can be obtained. In this study, La-Fe nanotube arrays were prepared by electrochemical deposition in aqueous solution system based on porous alumina templates (including commercial alumina filter membranes and self-made porous anodic alumina templates). The growth, morphology, structure and magnetic properties of different DC potential were systematically analyzed. It was found that with the increase of the deposition voltage (from -1.05 V to -1.3 V), La-Fe nanotubes), the effective length of nanotubes first increased and then decreased, resulting in overlying growth caused by excessive deposition potential. The atomic weight ratio of La/Fe has increased. The sample is amorphous and has no preferred growth orientation. The magnetic anisotropy of nanotube samples in parallel and perpendicular direction decreases gradually, and the saturation magnetization decreases gradually, so it is less and less easy to be magnetized. Compared with the La-Fe nanotubes in the commercial alumina template, the La-Fe nanotubes obtained from the self-made alumina templates can effectively solve the problem of single nanotubes, and adjust the opening during the preparation process. The pore size of AAO template can be selected by reaming time. Finally, the process and growth mechanism of AAO template made by second oxidation method were briefly described.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
【参考文献】
相关期刊论文 前1条
1 陆梅,覃东欢,力虎林;多孔氧化铝膜的制备及其表征(英文)[J];兰州大学学报;2002年04期
相关硕士学位论文 前1条
1 闫永彦;钐钴合金纳米管的电化学调控和磁性能研究[D];内蒙古大学;2013年
，本文编号：2366090
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