Fig. 2

a Photothermal heating curves of water and BTFB@Fe@Van (0.1 mg mL⁻¹) under 1064 nm laser irradiation (1.0 W cm⁻²). b Linear correlation between the cooling time and negative natural logarithm of the driving force temperature. c Photothermal stability of BTFB@Fe@Van over five on/off cycles. d ·OH generation quantified from the decrease in MB absorbance at 664 nm ([BTFB@Fe@Van] = 0.1 mg mL⁻¹, [H₂O₂] = 0.1 mM, and [MB] = 1.0 mM) with different treatments [pH 7.4, pH 5.5, and pH 5.5 with 1064 nm laser irradiation (1.0 W cm⁻²)]. e ESR spectra of the aqueous solutions of BTFB@Fe@Van under different conditions ([H₂O₂] = 0.1 mM, and [H₂O₂] = 0.1 mM with 1064 nm laser irradiation (1.0 W cm⁻²)). f Van release from BTFB@Fe@Van under different environments (pH 7.4, pH 5.5, and pH 5.5 with 1064 nm laser irradiation (1.0 W cm⁻²)