Fig. 4. (a) The schematic illustration of pH/temperature (pH/temp) stimuli-responsive drug release. (b) Temperature curves of the utReS₂@RSV–FA solution (0, 25, 50, 100 and 200 ppm) under laser irradiation (5 min, 808 nm, 1 W cm⁻²). (c) Temperature changes of utReS₂@RSV–FA after 5 cycles of irradiations (5 min, 808 nm, 1 W cm⁻²). (d) Release kinetics of RSV from utReS₂@RSV–FA in pH = 7.4 and 6.5 with or without NIR laser irradiation, respectively.