Effect of Functionalized Carbon Nanotubes and their Citric Acid Polymerization on Mesenchymal Stem Cells In Vitro

Table 1

Data of the four types of nanotubes including C, N, and Fe wt.% estimated by EDS with an estimated error of 1%; diameter of the CNTs obtained by SEM and the I_D/I_G ratio by Raman spectroscopy.

	(wt% C)	(wt% O)	(wt% N)	(wt% Fe)	Diameter (nm)	ID/IG
fMWNTs	94.98	2.6	—	2.44	≈89.2	0.41
PMWNTs	93.96	4.23	—	1.81	≈107.2	0.43
fCNx	92.48	3.3	2.84	1.38	≈69.3	0.89
PCNx	93.22	3.82	1.01	1.94	≈86.4	0.82
METHOD	EDS-SEM	EDS-SEM	EDS-SEM	EDS-SEM	SEM	RAMAN