Figure 2

SEM photos of HHF (a) and HHF-PODS (b). Elemental mapping images of HHF (O, S, Au) (c) and HHF-PODS (O, S, Au, Si, Cl) (d).

SEM photos of HHF (a) and HHF-PODS (b). Elemental mapping images of HHF (O, S, Au) (c) and HHF-PODS (O, S, Au, Si, Cl) (d).