Fig. 3.
Assessment of the biocompatibility, targeted imaging, and photothermal effect in vitro. a Cytotoxicity of PEG-Au@SiNRs. b LSCM images of CT-26 and 4T1 cells after incubation with RGD-Au@SiNRs (blocking with free peptides or not) or Au@SiNRs for 2 h at 37 °C. Scale bars, 25 μm. c Cell viability of CT-26 cells, which were first incubated with RGD-Au@SiNRs or Au@SiNRs for 4 h and then irradiated by an 808-nm laser (0.8 W cm−2) for 5 min as mean ± SD (n = 3). Asterisk (**) indicates p < 0.01