Figure 2.

In vitro characterization of the PB nanospheres. (A) TEM image of the PB nanospheres (the scale bar represents 100 nm); (B) particle sizes of the PB nanospheres before (red) and after 3-day incubation in serum at 37 °C (green); (C) and (D) the thermographs and corresponding heating curves of the PB nanospheres at varied concentrations upon 808 nm laser exposure (1 W/cm²); (E) the heating curves of the PB nanospheres upon repeated 808 nm irradiation (1 W/cm²); (F) the visible absorption profiles of the PB nanospheres before and after 5-cycle 808 nm irradiation (1 W/cm²); (G) particle sizes of the PB nanospheres before (red) and after (green) 5-cycle 808 nm irradiation (1 W/cm²).