Fig. 2From: Photochemically-driven highly efficient intracellular delivery and light/hypoxia programmable triggered cancer photo-chemotherapyPreparation and characterization of APP NPs. a Preparation of APP NPs. b SEM and (c) TEM of APP NPs. d Elemental distribution mapping of APP NPs. e Size distribution of APP NPs. f Zeta potential of PCN-224 and APP NPs. g UV–vis spectrum of AQ4N, PDA, PCN-224, AP NPs, and APP NPsBack to article page