Controlled synthesis and magnetic properties of Ni nanotubes and nanowires

Controlled synthesis and magnetic properties of Ni nanotubes and nanowires
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Ni纳米管和纳米线的可控合成及其磁性能

DOI:
10.1016/j.materresbull.2017.07.044
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发表时间:
2017-11
影响因子:
5.4
通讯作者:
张新伟
张新伟
中科院分区:
材料科学2区
文献类型:
--
作者:
张新伟

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以硝酸镍、柠檬酸和氨水为原料,采用模板辅助溶胶-凝胶自燃烧法合成了平均直径约为140 nm的镍纳米管和纳米线。采用简易阳极氧化法制备了阳极氧化铝模板。通过调节溶胶-凝胶过程中的实验条件,可以很好地控制最终产物的管状或线状形貌。透射电子显微镜表征表明,镍纳米管是非常脆弱的,可以很容易地打破成短的纳米管片,但镍纳米线是紧凑的,具有非常高的纵横比。磁性测量结果表明,镍纳米线和镍纳米管在室温下都具有超顺磁性。
Ni nanotubes and nanowires with an average diameter of about 140 nm are synthesized by a template-assisted sol-gel autocombustion method using nickel nitrate, citric acid and ammonia as the starting materials. The anodic aluminum oxide templates are prepared by a facile anodizing method. By adjusting the experimental conditions in the sol-gel process, the final products having tubular or wire-like morphologies can be perfectly controlled. Transmission electron microscope characterization indicates that the Ni nanotubes are very friable and can be easily broken into pieces of short nanotubes, but the Ni nanowires are compact and have very high aspect ratios. Magnetic measurements indicate that both the Ni nanowires and the Ni nanotubes possess superparamagnetism at room temperature.
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