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Composition Dependent Magnetic Properties of Ni-Co-P Coated Carbon Nanotubes
Min Ye*1,2, Ting Xie1,2, Bao-lin He3, Yu-cheng Wu1,3, Guo-wen Meng1, Li-de Zhang1
1.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;2.Institute of Tribology, Hefei University of Technology, Hefei 230009, China;3.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Abstract:
Carbon nanotubes were coated with a layer of nickel-cobalt-phosphorus (Ni-Co-P) alloy with different compositions of Ni/Co through electroless plating. The effects of the concentration ratio of Co2+to Ni2+, bath temperature, and pH on deposition rate are discussed. The prepared carbon nanotubes covered with Ni-Co-P were characterized and analyzed by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive spectroscopy, and a vibrating sample magnetometer. The results show that the deposition rate reached the maximum when the concentration ratio of Co2+to Ni2+ is 1 and the pH is 9; the deposition rate increases with the increase of bath temperature. The measurements of the magnetic properties of the obtained carbon nanotubes covered with Ni-Co-P indicate that the magnetic properties greatly depend on the concentration ratio of Co2+to Ni2+and the magnetic saturation reaches the maximum value when the Co2+to Ni2+ ratio is 1. In addition, there are two peaks in the coercivity curve at Co2+to Ni2+ ratios of 1/2 and 4/1, while the two peaks in the magnetic conductivity curve are located atCo2+to Ni2+ ratios of 1/4 and 4/1.
Key words:  Ni-Co-P, Carbon nanotube, Electroless plating, Composition, Magnetic prop-erty
FundProject:
Composition Dependent Magnetic Properties of Ni-Co-P Coated Carbon Nanotubes
叶敏*1,2, 解挺1,2, 何宝临3, 吴玉程1,3, 孟国文1, 张立德1
1.中国科学院固体物理研究所材料物理重点实验室,合肥230031;2.合肥工业大学摩擦学研究所,合肥230009;3.合肥工业大学材料科学与工程学院,合肥230009
摘要:
用化学镀方法在碳纳米管表面沉积了具有不同镍/钴成分配比的镍钴磷合金层.讨论了Co2+与Ni2+的浓度比、镀液温度、pH值对沉积速率的影响.并利用场发射扫描电镜、透射电镜、X射线衍射仪、能谱仪和磁性测量仪对镍钴磷包覆碳纳米管进行了系统的结构和性能表征.结果表明:当镀液中Co2+与Ni2+的浓度比为1,pH值为9时沉积速率最大;镀液温度的升高会使沉积速率增大.磁性测试结果显示碳纳米管表面镀覆Ni-Co-P镀层后,其磁性能对镀层中的Ni、Co相对含量有强烈的依赖性.当Co2+: Ni2+=2:1时,饱和磁化强度最大.矫顽力分别在Co2+: Ni2+=1:2和Co2+: Ni2+=4:1时有2个峰值; 而磁导率分别在Co2+: Ni2+=1:4和Co2+: Ni2+=4:1时有2个峰值.
关键词:  镍钴磷合金,碳纳米管,化学镀,成分,磁性
DOI:10.1088/1674-0068/22/04/411-416
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