Fig. 2
Characterization of PPIAO NPs. a Transmission electron microscopy image of PPIAO. Scale bar 500 nm. b Scan electron microscopy image of PPIAO and PPIO. Scale bar 100 nm. c FTIR spectrum of PPIAO, PPIO and Al(OH)3. d X-ray photoelectron spectroscopy spectrum of PPIAO. e Energy dispersive spectroscopy analysis of PPIAO. The corresponding elemental mapping images. Scale bar 200 nm. f UV–Vis absorbance spectra and g Fluorescence spectra of PPIAO, PPIO and free ICG. Evaluation of the optical properties of ICG in nanoparticles. h SOSG detection of 1O2 generation. λexcitation/λemission = 504 nm/525 nm. i, j Thermal infrared images of PPIAO aqueous suspensions irradiated with different intensities of the 808 nm laser. k Temperature variation of PPIAO, PPIO and free ICG, compared with ddH2O.