Fig. 2
a The temperature change versus irradiation time of FeDH aqueous dispersions at different concentrations. Curves. b The heating curve of ICG@FeDH, FeDH and H2O under the same conditions (1Â W/cm2, 5Â min). c Temperature change value and d thermal imaging photos at different time points of the corresponded samples in b. e Temperature change of ICG@FeDH dispersions exposed to photothermal heating and natural cooling cycles under 808Â nm laser irradiation. f Measurement of photothermal conversion efficiency of ICG@FeDH at 808Â nm