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Preparation and characterization of cobalt oxides nanoparticles starting from Co(II) carboxylate precursors

O. STEFANESCU1,* , C. DAVIDESCU1, C. MUNTEAN1

Affiliation

  1. Politehnica University Timisoara, Applied Chemistry and Inorganic Compounds Engineering, 6 Vasile Parvan Blvd., 300223, Timisoara, Romania

Abstract

We have successfully used new Co(II) carboxylate compounds for the preparation of nanocrystalline cobalt oxide powders. The Co(II) carboxylate compounds were obtained in the redox reaction between Co(NO3)26H2O and diol (1,2-etandiol and 1,3-propanediol). Co(II) carboxylate compounds with different structures can be obtained depending on the starting material (diol) and the synthesis parameters. As a result, different crystalline phases can be obtained by appropriate thermal treatment: Co3O4, CoO and metallic Co. The redox reaction between the NO3- ion and diol takes place at 90°C. Depending on the Co(NO3)26H2O – diol system and the molar ratio of the reagents, the redox reaction can be controlled, with isolation of the Co(II) complex combination as pink powder or a burning process can take place, leading to a grey powder. Thermal decomposition of the isolated Co(II) complex combination, at 350°C, leads to CoO, Co3O4 or cobalt oxides mixtures. The Co(II) complex combination was characterized by thermal analysis and FT-IR spectrometry. The phase evolution and morphology of the oxides powders were studied by X-ray diffraction and Scanning Electron Microscopy..

Keywords

Carboxylate precursor, Cobalt oxides, Redox reaction, XRD.

Submitted at: April 9, 2015
Accepted at: June 24, 2015

Citation

O. STEFANESCU, C. DAVIDESCU, C. MUNTEAN, Preparation and characterization of cobalt oxides nanoparticles starting from Co(II) carboxylate precursors, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 7-8, pp. 991-996 (2015)