Synthesis of compositionally graded nanocast NiO/NiCo2O4/Co3O4 mesoporous composites with tunable magnetic properties

Moisés Cabo; Eva Pellicer; Emma Rossinyol; Marta Estrader; Alberto López-Ortega; Josep Nogués; Onofre Castell; Santiago Suriñach; Maria Dolors Baró

doi:10.1039/C0JM00406E

Synthesis of compositionally graded nanocast NiO/NiCo₂O₄/Co₃O₄ mesoporous composites with tunable magnetic properties†

Moisés Cabo,^a Eva Pellicer,*^a Emma Rossinyol,^b Marta Estrader,^c Alberto López-Ortega,^c Josep Nogués,^d Onofre Castell,^b Santiago Suriñach^a and Maria Dolors Baró^a

Author affiliations

* Corresponding authors

^a Departament de Física, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Spain
E-mail: Eva.Pellicer.icn@uab.cat

^b Servei de Microscòpia, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Spain

^c Centre d'Investigació en Nanociència i Nanotecnologia (ICN-CSIC), Campus Universitat Autònoma de Barcelona, Bellaterra, Spain

^d Institució Catalana de Recerca i Estudis Avançats (ICREA) and Centre d'Investigació en Nanociència i Nanotecnologia (ICN-CSIC), Campus Universitat Autònoma de Barcelona, Bellaterra, Spain

Abstract

A series of mesoporous NiO/NiCo₂O₄/Co₃O₄ composites has been synthesized by nanocasting using SBA-15 silica as a hard template. The evaporation method was used as the impregnation step. Nickel and cobalt nitrates in different Ni(II) : Co(II) molar ratios were dissolved in ethanol and used as precursors. The composites show variable degrees of order, from randomly organized nanorods to highly ordered hexagonally-packed nanowires as the Ni(II) : Co(II) molar ratio decreases. The materials exhibit moderately large surface areas in the 60–80 m² g⁻¹ range. Their magnetic properties, saturation magnetization (M_S) and coercivity (H_C), can be easily tuned given the ferrimagnetic (NiCo₂O₄) and antiferromagnetic (NiO and Co₃O₄) character of the constituents. Moreover, the NiCo₂O₄ rich materials are magnetic at room temperature and consequently can be easily manipulated by small magnets. Owing to their appealing combination of properties, the nanocomposites are expected to be attractive for myriad applications.

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Article information

DOI: https://doi.org/10.1039/C0JM00406E
Article type: Paper
Submitted: 13 Feb 2010
Accepted: 17 May 2010
First published: 07 Jul 2010

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J. Mater. Chem., 2010,20, 7021-7028

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Synthesis of compositionally graded nanocast NiO/NiCo₂O₄/Co₃O₄ mesoporous composites with tunable magnetic properties

M. Cabo, E. Pellicer, E. Rossinyol, M. Estrader, A. López-Ortega, J. Nogués, O. Castell, S. Suriñach and M. D. Baró, J. Mater. Chem., 2010, 20, 7021 DOI: 10.1039/C0JM00406E

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Journal of Materials Chemistry