离子型表面活性剂分散多壁碳纳米管的性能及机理研究

Study on the Performance and Mechanism of Ionic Surfactant Dispersing Multi Walled Carbon Nanotubes

摘要: 自碳纳米管被发现以来其优异的性能使其具有在诸多领域应用，而如何更好地分散其一直是研究的一个重点。目前关于分散的机理和性能的研究存在不足，针对该问题本研究选择了十二烷基硫酸钠(SDS)、十二烷基苯磺酸钠(SDBS)、十六烷基三甲基溴化铵(CTAB)三种不同离子型表面活性剂在不同浓度下与三种直径的碳纳米管制备为分散体系，利用UV-vis光谱、FT-IR光谱，Raman光谱，TEM、Zeta电位分析对其分散性能和分散机理进行分析，结果表明十二烷基苯磺酸钠具有的苯环于碳纳米管产生了π-π键作用使其分散性能优于其他两种表面活性剂，并通过不同表面活性剂浓度下分子链长度的对比解释表面活性剂在不同浓度下与碳纳米管的作用机理。

Abstract: Since the discovery of carbon nanotubes, their excellent properties have made them applicable in many fields, and how to better disperse them has always been a research focus. At present, there is a lack of research on the mechanism and performance of dispersion. To address this issue, this study selected three different ionic surfactants, sodium dodecyl sulfate (SDS), sodium dodecylbenzenesulfonate (SDBS), and hexadecyltrimethylammonium bromide (CTAB), to prepare dispersion systems with three different diameters of carbon nanotubes at different concentrations. UV-vis spectroscopy, FT-IR spectroscopy, Raman spectroscopy, and TEM were used to analyze their dispersion performance and mechanism. The results indicate that the benzene ring in sodium dodecylbenzenesulfonate forms π-π bonding with carbon nanotubes, leading to superior dispersion performance compared to the other two surfactants. Furthermore, by comparing the lengths of molecular chains at different surfactant concentrations, the mechanism of interaction between surfactants and carbon nanotubes at varying concentrations is explained.