中文摘要：

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。

英文摘要：

Carbon nanotubes（CNTs） were synthesized via catalytic decomposition of benzene at temperature as low as 460 ℃ over Co nanoparticles derived from sol-gel synthesis followed by hydrogen reduction.The as-prepared material was characterized by techniques,such as X-ray diffraction,laser Raman spectroscopy,field-emission scanning electron microscopy,transmission electron microscopy（TEM） and vibrating sample magnetometer（VSM）.After optimization of reaction parameters,the highest yield and purity of CNTs were ca.50 and 98.02 wt%,respectively.A relatively high value of magnetization was observed over the composite due to the encapsulation of ferromagnetic Co nanoparticles.Compared with the synthesis method using benzene as the carbon source in the past,the low-temperature approach is simple,low cost,and environmentally friendly for large-scale production of magnetic carbon nanocomposites.