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(A) Ultraviolet-visible absorbance spectra of pristine single-walled carbon nanotubes (SWCNTs) (i), plain doxorubicin (DOX) (ii), DOX-folic acid (FA)-polyethylene glycol (PEG)-SWCNTs (iii), and DOX-PEG-SWCNTs (iv). (B) Pristine SWCNTs, (C) fluorescein isothiocyanate (FITC)-PEG, (D) FITC-PEG-SWCNTs.
