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Characterizations of the nanoparticles (NPs). (A) Fourier transform infrared (FT-IR) spectrum of the BPQDs-based nanoparticles. (B) Raman spectra of the NPs. (C) X-ray photoelectron spectroscopy (XPS) spectrum of BPQDs-PEG-FA/DOX. (D) DOX release profiles of BPQDs-PEG-FA/DOX at different pH values with or without near infrared laser irradiation (1.0 W cm−2, 6 min).
