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以己烷为碳源,二茂铁为催化剂前躯体,应用喷雾热解法,制备了多壁碳纳米管(MWCNTs)。采用酸沥滤和空气氧化对MWCNTs进行纯化。利用SEM、TEM、XRD、EDS、TGA及Raman光谱分析等方法分别对原生和纯化MWCNTs进行表征。为制得优质、高产MWCNTs,对制备工艺参数作了优选,分别研讨了最佳制备参数,包括:二茂铁升华温度、己烷中二茂铁浓度、热解温度和时间,己烷与H2的流量比。MWCNTs具有典型的腊肠状(Sawsage-like)构型,长度大于数十微米,内、外管径分别为15nm～45nm及25nm～70nm,MWCNTs的纯度和产率的质量分数分别高于95%和70%。
Multiwalled carbon nanotubes (MWCNTs) were prepared by spray pyrolysis using hexane as a carbon source and ferrocene as a catalyst precursor. MWCNTs were purified by acid leaching and air oxidation. The primary and purified MWCNTs were characterized by SEM, TEM, XRD, EDS, TGA and Raman spectroscopy. In order to obtain high quality and high yield MWCNTs, the preparation process parameters were optimized. The optimal preparation parameters were discussed respectively, including the ferrocene sublimation temperature, the concentration of ferrocene in hexane, the pyrolysis temperature and time, Traffic ratio. The MWCNTs have a typical Sawsage-like configuration with a length of more than tens of micrometers and internal and external diameters of 15 nm-45 nm and 25 nm-70 nm, respectively. The purity and yield of MWCNTs are higher than 95% and 70%.