Fig. 2

Photothermal and photodynamic performance of SPN-PT. A Photothermal conversion behavior of different concentrations of SPN-PT under laser irradiation (635 nm, 0.45 W cm⁻²). B IR thermal images of SPN-PT at concentrations corresponding to A irradiated by laser (635 nm, 0.45 W cm⁻²). Temperature elevation curves (C) and IR thermal images (D) of SPN-PT (100 µg ml⁻¹) irradiated by different power densities of laser (635 nm, 0.05 W cm⁻² - 0.60 W cm⁻²). E Temperature change curves of SPN-PT (100 µg mL⁻¹) over 5 ON/OFF cycles employing 635 nm laser (0.5 W cm⁻²) followed by passive cooling every 5 min. F The photothermal heating and cooling curves of SPN-PT and PBS under the 635 nm laser irradiation (0.6 W cm⁻²). G Linear time data versus negative natural logarithm was obtained from the cooling period. Absorption spectra change of DPBF incubated with SPN-PT and irradiated by 635 nm laser at 0.5 W cm⁻² (H) and 0.75 W cm⁻² (I). J Absorption intensity changes of DPBF at 419 nm in the presence of SPN-PT (50 µg mL⁻¹) with the irradiated time of 635 nm laser (0.5 W cm⁻², red; 0.75 W cm⁻², black)