Abstract

Nanoscaled self-assemblies with engineered architectonics are important for obtaining advanced materials with specific applications in nanotechnology. We investigated here the morphology features at the nanoscale of the assemblies of the mixed oxides obtained through the thermal transformation of Zn²⁺Me³⁺ (Me=Al/Ga) layered double hydroxides (LDHs), as their “as-synthesized” form or after they were reconstructed in the aqueous solution of Ga₂(SO₄)₃. The characteristics of ZnMe LDHs and the derived assemblies of mixed oxides were assessed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM/EDX), N₂ adsorption at −196°C and thermal analyses (TG/DTG/DSC). The results revealed the formation nanoscaled assemblies of ZnO/ZnAl₂O4/ZnGa₂O₄ and ZnO/Ga₂O₃/ZnGa₂O₄ starting from ZnMe(Me=Al/Ga) as precursors. Results point out that both the composition of the LDHs and the calcination temperatures can be used as parameters for tuning the nanomorphology features of the studied mixed oxides.

Keywords: Mixed oxides, layered double hydroxides, nanoscaled assemblies

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Ignat, C. E.; Carja, G.; Romila, L. E.; Lutic, D. Beilstein Arch. 2019, 201955. doi:10.3762/bxiv.2019.55.v1

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