Fig. 4: Characterization of the morphology, composition and structure of CuZnHis(L) assemblies.

a The average diameter in TEM images was 264 nm (n = 50 nanoparticles). b Hydrated diameter and zeta potential. Zeta potential are presented as mean ± SD (n = 3). c FTIR spectra. d TGA and DTG analysis. e MALDI-TOF mass spectrum. f XPS Cu 2p3/2 spectrum. g XANES spectra at the Cu K-edge. h, i EXAFS fitting curves of Cu in CuZnHis(L).