不同氧化体系处理对多壁碳纳米管的影响

Effect of the treatment by different oxidation system on multiwalled carbon nanotubes

采用3种氧化体系(H2SO4/H2O2,H2SO4/K2Cr2O7,H2SO4/HNO3)对多壁碳纳米管(MWC-NTs)进行处理,通过红外光谱、拉曼光谱、热失重、滴定分析、Zeta电位激光粒度分析仪、透射电镜对氧化前后的样品进行表征。结果表明,氧化处理未明显破坏MWCNTs的管状结构,并在表面引入羧基官能团,滴定分析显示按上述氧化体系的顺序样品的表面羧基含量分别为0.95%,6.08%,9.2%;氧化后样品能在水相中形成较稳定的分散。

Multiwalled carbon nanotubes（MWCNTs） were functionalized with three kinds of oxidation system（H2SO4/H2O2,H2SO4/K2Cr2O7,H2SO4/HNO3）,respectively.The samples were characterized by Fourier transform infrared spectroscopy（FT-IR）,Raman spectroscopy,transmission electron microscopy（TEM）,thermogravimetry analysis（TGA） and zeta potential measurement analyzer.The results show that the tubular structures of MWCNTs are not distinctly destroyed.In addition,carboxylic groups（—COOH） are induced onto the surface of MWCNTs,the corresponding amounts of carboxyl are determined as 0.95%,6.08% and 9.2% by acid-base titration according to the above sequence of oxidation system.Oxidized samples are dispersed in deionized water uniformly and stably.