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Multifunctional Nanostructured Co-doped ZnO: The Co Spatial Distribution and the Correlated Magnetic Properties

Abstract

The doping process at nanoscale is one of the most active and attractive research topic in materials science and condensed-matter physics. Significant advances have been achieved in the last few years; however, the complete knowledge of the principal factors that affect the final results of the doping is still under debate. The nature of the magnetic properties of transition-metal-doped oxides is also a highly controversial issue. In this report we present a systematic structural and magnetic analysis of Co-doped ZnO nanoparticles prepared via microwave-assisted hydrothermal route. The structural data confirm the incorporation of the Co ions into the wurtzite ZnO lattice and a Co concentration mainly near/at the surface of the nanoparticles. This Co spatial distribution is set to passivate the surface of the ZnO nanoparticles, inhibiting the nanoparticle growth and suppressing the observation of a ferromagnetic phase. Based on experimental and theoretical results we propose a kinetic-thermodynamic model for the processes of nucleation and growth of the Co-doped ZnO nanoparticles, and attribute the observed ferromagnetic order to a ferromagnetism associated to specific defects and adsorbed elements at the surface of the nanoparticle. Our findings give valuable contribution to the understanding of both the doping process at nanoscale and the nature of the magnetic properties of the Co-doped ZnO system.

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Publication details

The article was received on 05 May 2018, accepted on 08 Jul 2018 and first published on 09 Jul 2018


Article type: Paper
DOI: 10.1039/C8CP02870B
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Multifunctional Nanostructured Co-doped ZnO: The Co Spatial Distribution and the Correlated Magnetic Properties

    R. T. da Silva, A. Mesquita, A. O. de Zevallos, T. Chiaramonte, X. Gratens, V. A. Chitta, J. M. Morbec, G. Rahman, V. M. García-Suárez, A. C. Doriguetto, M. I. B. Bernardi and H. B. B. de Carvalho, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP02870B

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