化学处理对碳纳米管分散性能的影响

Effect of Chemical Treatment on the Dispersion Properties of Carbon Nanotubes

采用混酸氧化法对碳纳米管进行化学处理,制备了分散均匀的稳定的碳管悬浮液.FTIR研究表明:经化学处理后的碳管表面带上了羧基及羟基等基团. TEM显示处理后的碳管缠绕程度明显降低. ζ电位测试结果表明,处理后碳管表面酸根离子的离解增大了碳管表面的负电荷,增强了悬浮液的稳定性.通过测定有效粒径及沉降百分比进一步证实了处理后的碳管悬浮液具有更高的分散性及稳定性.

The chemical oxidation in a mixture of concentrated acids was used to modify carbon nanotubes (CNTs). After treatment, stable homogeneous dispersions of CNTs were prepared. It was found by FTIR that the improvement of dispersibility should be due to the carboxyl groups and hydroxyl groups on the surface of modified CNTs. zeta potential measurements showed that the ionization of acidic surface groups led to a higher density of negative charge. TEM indicated that the CNTs were less twisted after treatment. The measurements of effective diameter and sediment percent further confirmed that the modified CNTs suspension had higher dispersibility and stability.