Fig. 6. Fluorescence images of HepG2 cells after incubating with appropriate medium containing Cdots for different time ((A) 3 min, (B) 10 min, (C) 15 min, (D) 1 h, (E) 24 h). (F) Relative pixel intensity of the corresponding fluorescence images (the pixel intensity from HepG2 cells incubated with Cdots for 24 h was defined as 1.0).
