Fig. 2
In vitro photothermal performance of HA-PDA@IQ/DOX NPs. a Diagram of the photothermal effect of HA-PDA@IQ/DOX NPs. b Vis–NIR absorbance spectra of HA-PDA@IQ/DOX. c Photothermal heating curves of HA-PDA@IQ/DOX at different concentrations and d under varied power densities. e Thermal imaging of HA-PDA@IQ/DOX NPs solution under different laser power density. f Periodical temperature changes of the HA-PDA@IQ/DOX NPs solution upon laser irradiation for five laser on/off cycles and g following Vis–NIR absorbance spectra. h Photothermal response of HA-PDA@IQ/DOX NPs solution treated with an NIR laser (808 nm, 2 W/cm2) for 600 s and left to cool down. i Linear time data versus − ln θ obtained from the cooling stage