射频等离子体辅助化学气相沉积方法生长碳纳米洋葱

用射频等离子体辅助化学气相沉积方法生长碳纳米洋葱.电子显微镜观察表明,产物中无碳纳米管等伴随生成,因而制得了较高产率、较高纯度的纳米洋葱.尤其是Co-SiO₂催化剂生长的碳纳米洋葱,实心、光滑,且内无催化剂颗粒,其外层由未闭合的、呈波浪状的石墨片构成,显示出与众不同的微观结构和性能.提出了该方法中碳纳米洋葱的生长机理为碳笼由里向外嵌套形成球形粒子.对波浪状、非闭合结构的形成过程进行了讨论.关键词：射频等离子体化学气相沉积碳纳米洋葱

GROWING CARBON BUCKONIONS BY RADIO FREQUENCY PLASMA-ENHANCED CHEMICAL VAPOR DEPOSITION

The preparation of carbon buckonions is reported.Large quantities and high percentage of carbon buckonions can be synthesised by radio frequency plasma-enhanced chemical vapor deposition on the Co catalysts and Co-SiO₂ catalysts.The product contains no carbon tubes,only carbon onions,which are solid,smooth and clean and can be separated easily from the catalystic particles.The growth of carbon buckonions is based on the formation of many cages in successive stages from the core to the surface.High-resolution transmission electron microscopy indicates that the outer layers of the carbon buckonions produced on Co-SiO₂ comprise unclosed small waving graphitic flakes.The formation process of these graphitic flakes is discussed.