Fig. 2. Characterization of Hb@AuNCs. (A) Size, polydispersity index (PDI) and zeta (ζ)-potential of free Hb and Hb@AuNCs and the corresponding size distributions. (B) Scanning transmission electron microscopy analysis of Hb@AuNCs showing an annular dark-field image (i) and the corresponding energy dispersive X-ray elemental map of Fe (red) and Au (yellow) (ii).
