Fig. 5. Photothermal therapy of 4T1 in vivo. (a) Thermal imaging of tumor-bearing mice after injection of PBS or Re NCs (25 μL, 2 mg mL^–1); (b) temperature change of the tumor section upon laser irradiation for 10 min (1 W cm^–2, 808 nm); (c) digital photographs of 4T1-bearing BALB/c mice from different groups at different times (0, 8 and 16 days); (d) H&E images of tumor sections harvested from the mice. Scale bar is 50 μm; (e) tumor volume change during treatment (n = 5, mean ± s.d., ***p < 0.001).