Thiago Eduardo Pereira Alves

Instituto Federal de Educação, Ciência e Tecnologia de Goiás (IFG) | IFG · Chemistry Department

Zinc substituted cobalt, magnesium and nickel ferrites (M(1−x)ZnxFe2O4, x = 0.0, 0.5) were prepared using combustion reaction techniques. The particle sizes were roughly round shaped with 1 μm dimensions. The Zn²⁺ substitution led to the increase in the crystal parameters with higher densities. The band shift in FTIR spectra was observed at 600 cm⁻...

Cobalt ferrite-gold nanocomposite (CoFe2O4@Au), were synthesized using for the first time the synthetic route that involved (i) the polyol method to produce cobalt ferrite nanoparticles (CoFe2O4), (ii) the surface of CoFe2O4 functionalized with APTES to obtain amino groups, (iii) decorated cobalt ferrite nanoparticles with the ultra-small gold nano...

Spinel CoFe2−xHoxO4 were synthesized with forced hydrolysis technique. The presence of constituent phases and particle growth was determined by XRD technique with Rietveld refinement and HRTEM fitted with EDS method. The strain effect due to the Ho³⁺ substitution was visible in the FTIR spectrum analysis. The increment of the reduced mass due to th...

In this study we prepared zinc oxide (ZnO) nanoparticles using the polyol method with zinc acetate and/or sodium acetate in a propylene glycol medium with varied hydrolysis reaction time (10, 60 and 300 min). It was observed that the hydrolysis reaction time and the concentration of acetate ions had a strong effect on the morphology and size of ZnO...

In this study we investigated the structural, optical band-gap, dielectric and magnetic properties of CoYxFe2-xO4 (0≦x≦0.04) nanoparticles (NPs) synthesized by combustion reaction method. The particle size measured from X-ray diffraction (XRD) patterns and transmission electron microscope (TEM) images confirms the nanostructural character in the ra...

Nanoparticles (NPs) of (0 ) were synthesized by combustion reaction method in order to study the effect of ions (x) on the dielectric properties. It was found that the reletive dielectric permittivity ( ) measured in a broad range frequency 100-2 MHz at room temperature. increases with the ions concentration and decreased with frequency, being 200...

We present a study of the structural and magnetic properties of Zn1−xFexO (0.00≤x≤0.09) nanoparticles prepared by a combustion reaction method. X-ray diffraction patterns of all samples showed sharp and intensive peaks of hexagonal wurtzite structure of ZnO without any evidence of spurious crystalline phases in all samples. The magnetic properties...

Low temperature (T) ac magnetic susceptibility (χac) measurements were performed in powder samples of the Zn1−xFexO (x=0–0.078) prepared by a combustion reaction method. The amplitude of the ac magnetic field was kept constant (1mT) while its frequency (f) varied in the range 10–104Hz for 5≤T≤300K. The diluted samples presented cusps with maxima di...

For the first time nanocrystalline magnetic particles of Mgx Fe(3−x)O4 with x ranging from 0.5 to 1.5 have been synthesized by a combustion reaction method using iron nitrate Fe(NO3)3.9H2O, magnesium nitrate Mg(NO3)2.6H2O, and urea CO(NH2)2 as fuel without intermediate decomposition and/or calcining steps. X-ray diffraction patterns of all systems...