Fig. 3
a Preparation of A1 NPs. b DLS data and TEM image of A1 NPs. c, d emission spectra and absorption spectra of A1 NPs in water. e Fluorescent images of different concentrations A1 NPs aqueous solution under 808 nm laser irradiation. f Function graph of fluorescence signal intensity at different concentrations. g The heating curve of different concentrations of A1 NPs under 808 nm irradiation (0.8 W/cm2). h Photothermal images of A1 NPs aqueous and PBS (330 µg/ml) after 5 min of 0.8 W/cm2 808 nm laser irradiation. i Photothermal heating curves of aqueous dispersions of A1 NPs (330 µg/ml) under different laser power. j Temperature change of A1 NPs aqueous solution over five on/off cycles of 808 nm laser irradiation (0.8 W/cm2, 330 µg/ml). k Temperature-increasing/decreasing curve. l Fluorescence spectra of DCFH under 808 nm laser irradiation (0.1 W/cm2) in the presence of A1 NPs at different post-irradiation times (0, 2, 4, 6, 8, and 10 min)