论文部分内容阅读
采用溶胶-凝胶结合氢气还原方法制备了Ni纳米颗粒,并用这种Ni纳米颗粒作为催化剂,通过催化裂解乙炔的方法在425℃制备了螺旋度较高且呈对称生长的螺旋碳纳米管。结果表明,本方法简单、成本低、环境友好,可大量制备高纯度螺旋碳纳米管。场发射扫描电镜(FE-SEM)及高分辨透射电镜(HR-TEM)图片表明,通常情况下两根旋向相反的螺旋碳纳米管生长在一个催化剂颗粒上,且这种纳米螺旋呈空心管状。X射线衍射及拉曼光谱分析表明,所得样品成分为有缺陷的石墨结构和镍多晶,未发现其他杂相。此外,对样品的磁性及微波吸收性能进行了研究。
Ni nanoparticles were prepared by sol-gel combined with hydrogen reduction method. With the Ni nanoparticles as catalyst, helical carbon nanotubes with high helicity and symmetric growth were prepared by catalytic cracking of acetylene at 425 ℃. The results show that the method is simple, low cost and environmentally friendly, and high purity helical carbon nanotubes can be prepared in large quantities. Field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) images show that in general, two oppositely oriented helical carbon nanotubes grow on one catalyst particle, and the nanoshells are hollow tubular . X-ray diffraction and Raman spectroscopy analysis showed that the resulting sample composition was flawed graphite structure and nickel polycrystalline, and no other heterogeneous phase was found. In addition, the magnetic and microwave absorption properties of the samples were studied.