Multifunctional nanostructured Co-doped ZnO: Co spatial distribution and correlated magnetic properties
Abstract: 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.
Author(s): da Silva, RT; Mesquita, A; de Zevallos, AO; Chiaramonte, T; Gratens, X; Chitta, VA; Morbec, JM; Rahman, G; Garcia-Suarez, VM ; Doriguetto, AC; Bernardi, MIB; de Carvalho, HB.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume: 20 Pages: 20257-20269 Published: AUG 14 2018
O Laboratório Aberto de Interatividade para Disseminação do Conhecimento Científico e Tecnológico (LAbI), vinculado à Universidade Federal de São Carlos (UFSCar), é voltado à prática da divulgação científica pautada na interatividade; nas relações entre Ciência, Arte e Tecnologia.
Effects of microwave-assisted hydrothermal treatment and of use of capping reagent on the photophysical properties of SrMoO4 phosphors Abstract: Strontium molybdate particles (SrMoO4) with uniform shapes have applications in various fields such as phosphors, optical fibers, […]
Tuning Electrochemical Bistability by Surface Area Blocking in the Cathodic Deposition of Copper Abstract: We report herein a precise control of the electrochemical bistability induced by surface area changes during the cathodic deposition of copper. Small […]
Phosphate glasses via coacervation route containing CdFe2O4 nanoparticles: structural, optical and magnetic characterization Abstract: CdFe2O4 nanoparticles of around 3.9 nm were synthesized using the coprecipitation method and protected by a silica layer. The nanoparticles were mixed […]