Microstructural and optical properties of spinel oxide MxCo2 − xMnO4 (M = Ni, Zn or Cu; 0 < x < 1) thin films prepared by inorganic polycondensation and dip-coating methods

Thi Ly Le (1) , Sophie Guillemet-Fritsch (1) , Pascal Dufour (1) , Christophe Tenailleau (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Spinel oxide nanoparticles of MxCo2 − xMnO4 (M = Ni, Zn, Cu; 0 < x < 1) were prepared at 120 °C by the inorganic polycondensation method. Phase composition and microstructure of each sample powder thus obtained were characterized by X-ray diffraction, X-ray fluorescence and scanning electron microscopy. Nanoparticles are well crystallized and uniformly distributed in both shape and size. Colloidal dispersions were stabilized in a low cost and environmentally friendly solvent solution. Spinel oxide thin films were then deposited on glass substrates by using the dip-coating technique. Their optical properties were measured in the 300–1100 nm wavelength range. Thin films show extremely good absorbance in the ultra-violet and blue regions. The highest absorbance observed in the red region was for x = 0.15 in zinc. A smaller direct band gap was determined when a low amount of doping M element was introduced in the cobalt and manganese spinel oxide material.

Mots clés: Optical properties; Spinel oxide; Colloidal dispersion; Thin films; Ceramics

Domaines: Matériaux

Thi Ly Le, Sophie Guillemet-Fritsch, Pascal Dufour, Christophe Tenailleau. Microstructural and optical properties of spinel oxide MxCo2 − xMnO4 (M = Ni, Zn or Cu; 0 < x < 1) thin films prepared by inorganic polycondensation and dip-coating methods. Thin Solid Films, 2016, 612, pp.14-21. ⟨10.1016/j.tsf.2016.05.030⟩. ⟨hal-01566926⟩