Fig. 3.

. (a) Viablity of Cells incubated with free DOX (2 μg/mL, ∼3.5 μM, corresponding to the DOX content of 50 μg/mL AuNRs@DOX) and different AuNRs (50 μg/mL) for 24 h, and then irradiated under a 808 nm NIR laser (0.1 W/cm²) for different period. * indicates significant difference between different groups within same time frame at p < 0.05 level. (b) Apoptosis analysis of cells treated with DOX and different AuNRs (50 μg/mL) and irradiated with an 808 nm NIR laser for 90 s (0.1 W/cm²).