SUPERPARAMAGNETIC COBALT NANOCOMPOSITES SYNTHESIZED BY SOLVOTHERMAL SYNTHESIS IN A SINGLE STEP

Castillo Carolina, Santana Paula

Keywords: nanocomposites, nanoparticles, cobalt, solvothermal synthesis, superparamagnetic

Abstract

In this work we are reporting the synthesis and characterization of superparamagnetic cobalt nanocomposites obtained from the direct reduction of cobalt(II) salts on matrices of graphene (G) and carbon nanodisks/nanocones (Ndc) in the presence of L-serine under solvothermal conditions. The synthesized nanocomposites were characterized by X-ray powder diffraction techniques identifying in all cases the peaks associated to the matrix (G or Ndc) and three peaks at 2θ values of 44,2; 51,5; 75,8°, which correspond to the Miller indices (111), (200), (220), characteristic of a face-centered cubic Co° phase. The SEM images of cobalt nanocomposites show that that using of a matrix changes the size and distribution of the metallic agglomerates, being possible to observe a more homogenous dispersion of the cobalt agglomerates on the Ndc matrix surface. Cobalt nanocomposites have a superparamagnetic behavior presenting Hc values of 14 and 60 Oe for NPs-Co°/G and NPs-Co°/Ndc respectively. The superparamagnetic property of the cobalt nanoparticles and unique properties of the matrix would generate a magnetic material with interesting properties to be studied. More research is needed to give it a potential application.

Más información

Título de la Revista: Journal of the Chilean Chemical Society
Volumen: 66
Número: 4
Editorial: SOC CHILENA QUIMICA
Fecha de publicación: 2021
Página de inicio: 5312
Página final: 5315
Idioma: Inglés
Financiamiento/Sponsor: Universidad Autónoma de Chile
URL: http://dx.doi.org/10.4067/s0717-97072021000405312
Notas: Scielo