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Synthesis and magnetic properties of nanostructured metallic Co, Mn and Ni oxide materials obtained from solid-state metal-macromolecular complex precursors

Abstract : The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x), MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 degrees C under air, give nanostructured Mn2O3, Co3O4 and NiO. The polymer acts as a template in the solid state, which is eliminated after the combustion process. At an intermediate stage, a layered graphitic carbon matrix was observed by HRTEM over the grown metal oxides. A mechanism for the growth of nanostructured oxides is discussed, including Raman studies. The nanostructured Mn2O3, Co3O4 and NiO particles grow over graphite layers and the solid-state role of chitosan is crucial for the formation of this graphite substrate. An antiferromagnetic transition was observed in Co3O4 nanoparticles, with T-N = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01542756
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, June 20, 2017 - 10:13:25 AM
Last modification on : Thursday, March 5, 2020 - 2:06:57 PM

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C. Diaz, M. L. Valenzuela, M. A. Laguna-Bercero, A. Orera, D. Bobadilla, et al.. Synthesis and magnetic properties of nanostructured metallic Co, Mn and Ni oxide materials obtained from solid-state metal-macromolecular complex precursors. RSC Advances, Royal Society of Chemistry, 2017, 7 (44), pp.27729--27736. ⟨10.1039/c7ra00782e⟩. ⟨hal-01542756⟩

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