Fig. 2
Photothermal properties of TAFP composites. a UV–Vis spectrum of TAFP with different concentrations. b Standard curve of TAFP based on the absorbance in UV–vis. c Infrared thermal images of PBS and TAFP composites with different concentrations exposed to 808 nm NIR laser irradiation (1 W/cm2, 10 min). d Temperature variations of TAFP composites at different concentrations under 808 nm NIR laser irradiation (1 W/cm2, 10 min). e Temperature variations of TAFP composites (200 μg/mL) under the irradiation at various laser power intensities (0.5, 1.0, 1.5, and 2.0 W/cm2). f Temperature variations of TAFP composites exposed to five laser irradiation on/off cycles at a fixed concentration of 200 μg/mL (1 W/cm2, 10 min). g Heating/cooling curves of TAFP composites at a fixed concentration of 200 μg/mL exposed to 808 nm NIR laser irradiation (1 W/cm2). h Digital photos of TAFP composites dispersed in PBS for 24 h with various pH values (from left to right: 7.4, 6.5, and 5.5)