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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multifunctional nanostructured Co-doped ZnO: Co spatial distribution and correlated magnetic properties

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da Silva, Rafael T. [1] ; Mesquita, Alexandre [2] ; de Zevallos, Angela O. [1, 3] ; Chiaramonte, Thalita [4] ; Gratens, Xavier [5] ; Chitta, Valmir A. [5] ; Morbec, Juliana M. [1, 6] ; Rahman, Gul [7] ; Garcia-Suarez, Victor M. [8, 9] ; Doriguetto, Antonio C. [3] ; Bernardi, Maria I. B. [10] ; de Carvalho, Hugo B. [1]
Total Authors: 12
[1] Univ Fed Alfenas UNIFAL MG, Inst Ciencias Exatas, BR-37133840 Alfenas, MG - Brazil
[2] Univ Estadual Paulista UNESP, Inst Geociencias & Ciencias Exatas, Dept Fis, BR-13500900 Rio Claro, SP - Brazil
[3] Univ Fed Alfenas UNIFAL MG, Inst Quim, BR-37133840 Alfenas, MG - Brazil
[4] Univ Fed Sao Joao Del Rei UFSJ, Dept Ciencias Nat, BR-36301160 Sao Joao Del Rei, MG - Brazil
[5] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[6] Univ Duisburg Essen, Fac Phys, D-47057 Duisburg - Germany
[7] Quaid I Azam Univ, Dept Phys, Islamabad 45320 - Pakistan
[8] Univ Oviedo, Dept Fis, Oviedo 33007 - Spain
[9] Nanomat & Nanotechnol Res Ctr CINN, Llanera - Spain
[10] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 10
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 20, n. 30, p. 20257-20269, AUG 14 2018.
Web of Science Citations: 4

In this report we present a systematic structural and magnetic analysis of Co-doped ZnO nanoparticles prepared via a microwave-assisted hydrothermal route. The structural data confirm the incorporation of 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 with 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 the nanoscale and the nature of the magnetic properties of the Co-doped ZnO system. (AU)

FAPESP's process: 13/07909-4 - Preparation and characterization of magnetic oxides films nanostructured
Grantee:Maria Inês Basso Bernardi
Support type: Regular Research Grants
FAPESP's process: 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures
Grantee:Gennady Gusev
Support type: Research Projects - Thematic Grants