镀镍碳纳米管的制备及电磁性能

Preparation and Electromagnetic Properties of Ni-Coated Multi-Wall Carbon Nanotubes

将碳纳米管经过纯化、敏化、活化处理后,采用化学镀方法制备镀镍碳纳米管,利用DSC分析出合适的热处理温度,然后在惰性气体保护下进行退火处理。利用TEM、EDS、XRD对退火前后镀镍碳纳米管的形貌、元素组成、结构进行表征。结果表明:碳纳米管表面被成功镀上了一层镍磷合金,热处理后镀层更光滑,并发生晶化反应得到晶态镍,使得电磁性能得到较大提升。电性能测试表明,镀镍碳纳米管的电导率为450 S/m,热处理后提高到1 400 S/m。磁性能测试表明,镀镍碳纳米管热处理前后均表现为软磁性,热处理前饱和磁化强度为2.753 emu/g,热处理后提高到11.254 emu/g。

After purification, sensitization, activation of multi-wall carbon nanotubes （CNTs）, Ni-coated CNTs were produced by electroless plating. By DSC analysis, suitable heat treatment temperature is excavated, then Ni-coa-ted CNTs were annealed under inert gas atmosphere. The products were characterized by transmission electron micros-copy （TEM）, energy chromatography （EDS）, X-ray diffraction （XRD）. The results show that CNTs surface is suc- cessfully coated with a layer of nickel-phosphorus alloys, and Ni-coated CNTs after heat treatment is smoother and crystallization reaction is occurred, thereby electromagnetic performance is greatly enhanced. The test of electrical properties show that the conductivity of Ni-coated CNTs is 450 S/m, and is improved to 1 400 S/m after the heat treatment. The test of magnetic properties show Ni-coated CNTs before and after the heat treatment are soft magnetic material, the saturation magnetization is 2. 753 emu/g before the heat treatment, and is improved to 11. 254 emu/g af-ter the heat treatment.