Fig. 2. (a) A schematic design of Q4NPs showing Q4 molecules loaded in the DSPE-mPEG NPs. (b) The TEM image of the Q4NPs. (c) Fluorescence emission of Q4NPs under 808 nm excitation. (d) Photostability of Q4NPs in different media including water, PBS and serum under continuous 808 nm excitation for 1 h. (e) Cellular toxicity of Q4NPs in U87MG and NIH-3T3 cell lines.
