Surface characterization of ZnO/ZnMn2O4 and Cu/Mn3O4 powders obtained by thermal degradation of heterobimetallic complexes

From the selective transformation of the heterometallic (Zn–Mn or Cu–Mn) carboxylate complexes with 2,2′-bipyridyl by thermal degradation at relatively low (350 °C) temperature, it was possible to get either well defined spinel ZnMn2O4 over zinc oxide or well dispersed copper particles surrounded by a manganese oxide (Mn3O4) in a core–shell like structure. Morphology of the powder surface was examined by scanning electron microscopy with energy dispersive X-ray microanalysis (SEM/EDX). Surface composition was determined by X-ray photoelectron spectroscopy (XPS). Specific surface of the powders by nitrogen adsorption was found to be 33±0.2 and 9±0.06 m2 g−1 for Zn–Mn and Cu–Mn samples, respectively, which is comparable to those of commercial products.

From the selective transformation of heterometallic (Zn–Mn or Cu–Mn) carboxylate complexes, it was possible to get either well defined spinel ZnMn2O4 over zinc oxide or well dispersed copper particles surrounded by a manganese oxide (Mn3O4) in a core-shell like structure.Figure optionsDownload as PowerPoint slideHighlights
► Thermal degradation of heterometallic complexes results in fine disperse particles.
► Core-shell Cu/Mn3O4 particles are obtained.
► ZnMn2O4 spinel layer covers ZnO particles.