用FeCl_3作催化剂先体制备碳纳米结构

Carbon Nanostructures Synthesized Using FeCl_3 as Catalyst Precursor

以不同浓度的FeCl3溶液作为催化剂先体,利用乙醇催化燃烧法,在铜片上生长出了碳纳米管和碳纳米纤维。讨论了不同浓度的FeCl3催化剂先体对生长碳纳米材料产物和形貌的影响。利用扫描电镜,透射电镜和喇曼光谱对样品的形貌和结构进行了表征。实验结果表明,随着催化剂先体浓度增大,碳纳米材料产量增大,直径呈现增大趋势,其直径范围也逐渐变大。当催化剂先体浓度为0.01mol/L时,可以制备出直径较小的碳纳米管;当催化剂先体浓度为0.1mol/L时,可以制备出直径分布均匀的碳纳米管与碳纳米纤维的混合物;当催化剂先体浓度为1mol/L时,可以制备出直径分布不均匀的碳纳米纤维。

A rational and simple method for synthesizing carbon nanotubes and nanofibers was reported. In our experiment, copper plate was employed as substrate, FeC13 solution as catalyst precursor, and ethanol as carbon source. By applying 0. 01 mol/L, 0. 1 mol/L and 1 mol/L FeCl3 catalyst precursor solution to the copper plate, the effects of concentration on growth and structure of the as-grown nanomaterials are illustrated and discussed. The black powder was charac- terized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and Raman spectroscopy. The experimental results indicate that the density and diameter of the carbon nanotubes/nanofibers can be simply controlled by the concentration of the catalyst precursor.