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Cell uptake assays of CuS–Fn NCs. Confocal fluorescence images of U87 MG cells incubated with (a) or without (b) NIR dye Cy 5.5 labeled CuS–Fn. Cell actin and nuclei were stained with Alexa 488 conjugated phalloidin and DAPI, respectively. (c) Flow cytometry data of U87 MG cells treated with Cy 5.5 labeled CuS–Fn of different incubation time and incubation concentration (d). Scale bar 20 µm.
