多壁碳纳米管表面修饰化学官能团的定量分析

Quantitative determination of the functional groups on multi-walled carbon nanotubes

碳纳米管因其独特的结构及物理化学性质,已迅速成为化学、物理学、生物学及材料科学的研究热点。尽管在碳纳米管的定性表征方面发展了许多成熟的技术,对其表面功能化化学基团的定量分析却相对滞后,目前已公开报道的文献较少且大多局限于单壁碳纳米管的分析,对多壁碳纳米管这方面的系统研究还未见报道。本文首先合成了羧基化、氨基化两种多壁碳纳米管及三取代的羧基化C60,对多壁碳纳米管表面修饰的羧基和氨基进行了定量分析。结果发现酸碱滴定法是较为准确的测定多壁碳纳米管表面羧基含量的方法,脱Fmoc基团方法则能够简单准确地定量功能化碳纳米管表面氨基的含量。

Carbon nanotubes （CNTs） have attracted much attention in the fields of chemistry, physics, biology and material science due to their unique structure and physical and chemical properties. Although there have been many technologies to characterize CANTs qualitatively, for example, TEM, SEM, AFM and Raman spectra, quantitative assays for functional groups lag behind. Moreover, the reported results mainly focused on single-walled carbon nanotubes （SWNTs）. Systemic quantitative research for multi- walled carbon nanotubes （MWNTs） has not been appeared so far. In this research, carboxylic MWNTs, amino MWNTs and carboxylic C60 were first syntbesized. The carboxyhc and amino groups were separately quantified with acid-hase titration and the De- Fmoc group method. It was found that the acid-base titration method is an accurate method to quantify the carboxylic groups on MWNTs, and the De-Fmoc group method can simply and accurately determine the density of amino groups on functional MWNTs.