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

AuthorsDíaz, Carlos; Valenzuela, Maria Luisa; Laguna-Bercero, M. A. ; Orera, Alodia; Bobadilla, D.; Abarca, S.; Peña, O.
Issue Date2017
PublisherRoyal Society of Chemistry (UK)
CitationRSC Advances 7(44): 27729-27736 (2017)
AbstractThe simple reaction of chitosan with metallic salts yields (chitosan) (MLn)x, MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 °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 TN = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.
Publisher version (URL)https://doi.org/10.1039/C7RA00782E
Appears in Collections:(ICMA) Artículos
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