Fig. 3: Preparation and characterization of nanoparticles.

a Structural formula of polymers (P1-4), and schematic illustration of the self-assembly and H2O2 induced decomposition of NP4. b Hydrodynamic diameter of NP4 determined by dynamic light scattering (DLS) measurements. c Representative transmission electron microscopy (TEM) image of NP4. d Representative transmission electron microscopy energy-dispersive X-ray spectroscopy mapping of NP4.