Cobalt-filled carbon nanotubes were prepared in situ in the decomposition of benzene over Co/silica-gel catalysts.Unlike the previous reports, in this method, the catalysts need not be pre-reduced.

• 金属包覆层的质量受多种因素的影响，对碳纳米管而言，采用尽可能低的反应速度对获得高质量的金属包覆层非常重要。