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通过溶胶凝胶法和氢气还原法制备出Co纳米颗粒并以此作为催化剂材料,通过催化裂解苯的方法,实现了较低温度(460℃)下在Co纳米颗粒表面上合成碳纳米管。采用X射线衍射、激光喇曼光谱、场发射扫描电镜、透射电子显微镜和振动样品磁强计对所合成的碳纳米材料进行了表征。通过优化实验参数,可制备出最大产率和纯度分别为约50和98.02%(质量分数)的碳纳米管。由于铁磁性Co纳米颗粒的进入,使得整个复合物表现出比较好的磁性能。和以往以苯作为碳源合成碳纳米材料相比,此合成方案简单、成本低,且对环境无任何危害,非常适用于磁性碳纳米复合物的批量合成。
Co nanoparticles were prepared by sol-gel method and hydrogen reduction method and used as catalyst materials to synthesize carbon nanotubes on the surface of Co nanoparticles by catalytic cracking of benzene at lower temperature (460 ℃). The synthesized carbon nanomaterials were characterized by X-ray diffraction, laser Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and vibrating sample magnetometer. By optimizing the experimental parameters, carbon nanotubes with a maximum yield and purity of about 50 and 98.02% (mass fraction) can be prepared. Due to the entrance of ferromagnetic Co nanoparticles, the whole composite shows relatively good magnetic properties. Compared with the previous synthesis of carbon nanomaterials with benzene as a carbon source, the synthesis scheme is simple, low cost and without any harm to the environment, and is very suitable for batch synthesis of magnetic carbon nanocomposites.