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

Díaz, C. ; Valenzuela, M.L. ; Laguna-Bercero, M.A. (Universidad de Zaragoza) ; Orera, A. (Universidad de Zaragoza) ; Bobadilla, D. ; Abarca, S. ; Peña, O.

Resumen: 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 °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.

Idioma: Inglés

DOI: 10.1039/c7ra00782e

Año: 2017

Publicado en: RSC Advances 7, 44 (2017), 27729-27736
ISSN: 2046-2069

Factor impacto JCR: 2.936 (2017)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 71 / 171 = 0.415 (2017) - Q2 - T2

Factor impacto SCIMAGO: 0.863 - Chemistry (miscellaneous) (Q1) - Chemical Engineering (miscellaneous) (Q1)

Tipo y forma: Article (Published version)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)