Fig. 4: Conformation of molecular probes loaded onto PEG corona.
a, Fluorescence of Py-PEGn-Os (ester) loaded onto polymersomes. The loading amount of Py-PEGn-Os (ester) was the same for the different PEG spacers (n = 4, 13 or 25). b, Schematic of the fluorescence quenching of inserted Py by photoinduced electron transfer from Os to Py. c, Influence of the packing density of molecular probes on the surface accessibility of Os. Salt induced extension of the PEG spacer by screening the electrostatic repulsion between Os. d, Fluorescence change of Py-PEG4-Os or Py-PEGn-Os (ester) loaded onto polymersomes by adding NaCl. e, Schematic of an electrode prepared by drop-casting the mixture of Os-polymersomes and ITO nanoparticles onto FTO-coated glass. f,g, Cyclic voltammograms (f) and peak current (g) of Os-polymersomes/ITO modified electrode. The peak current density is the mean value of three cycles.
