Fig. 1
Synthetic procedure and characterization of the nanoparticles. a Schematics illustrating the step-by-step synthesis of the MSCPF NPs. b–d TEM image of MnO2 nanostructure (b), the obtained MSCP (c) and hollow PDA (d). e HAADF-STEM image and elemental mapping for MSCP NPs. f–g The size distribution and zeta potentials of MnO2, MnO2-SOR (MS), MnO2-SOR-Ce6 (MSC), MnO2-SOR-Ce6@PDA (MSCP) and MnO2-SOR-Ce 6@PDA-PEG-FA (MSCPF). h The UV–vis absorption of MnO2, MS, MSC, MSCP, MSCPF, SOR, Ce6, and HS-PGE-FA