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Effect of the Silica Cover on the Properties of Co 3 O 4 Nanoparticles

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Abstract

Cobalt oxide nanoparticles were functionalized with sodium citrate and coated with a silica shell (Co3O4@Q@SiO2). Different experimental configurations were tested in order to obtain low-sized cobalt oxide nanoparticles with high crystallinity, using the chemical reduction-oxidation method. Then, the nanoparticles were coated with silica using the Stöber method, obtaining a silica cover on top of the cobalt oxide nanoparticle surface with a few nanometers thickness. This method permits the functionalization of the nanoparticles at the time of coating. Results show that with a heat treatment of 500 ∘C, high-crystallinity cobalt oxide nanoparticles are obtained with a spherical shape and an average diameter of 30 nm, whereas the silica cover has 5 nm thickness. Evidence of nanoparticle functionalization was obtained through the measurement of the absorption bands of the functional groups of the sodium citrate with a silica cover. In addition, coated nanoparticles show a reduction of their magnetic remanence as well as their coercivity with respect to the uncoated nanoparticles since silica acts as barrier avoiding superficial contact between magnetic nanoparticles.

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Acknowledgments

This work was partly supported by Conacyt Mexico through the J. Román de Alba scholarship 273882. Thanks to C. Medina for the thoughtful comments on the writing.

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Authors and Affiliations

  1. Departamento de Físico-Matemáticas, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Col. Centro, 78000, San Luis Potosí, S.L.P., Mexico

    J. Román de Alba & J. R. Martínez

  2. Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Col. Centro, 78000, San Luis Potosí, S.L.P., Mexico

    J. R. Martínez & G. Ortega-Zarzosa

  3. Instituto de Física, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Col. Centro, 78000, San Luis Potosí, S.L.P., Mexico

    A. L. Guerrero

  4. Facultad de Ingeniería, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Col. Centro, 78000, San Luis Potosí, S.L.P., México

    A. L. Guerrero

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  1. J. Román de Alba
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de Alba, J.R., Martínez, J.R., Guerrero, A.L. et al. Effect of the Silica Cover on the Properties of Co 3 O 4 Nanoparticles. J Supercond Nov Magn 29, 2651–2658 (2016). https://doi.org/10.1007/s10948-016-3595-y

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