Abstract:

Abstract: 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 CNTs 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 synthesized. The carboxylic and amino groups were

separately quantified with acidbase 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.

Key words: MWNTs, functional groups, quantitative analysis, acidbase titration, DeFmoc group method