Identification of Nanostructural and Specific Absorption Rate (SAR) on Mn_0.25Fe_2.75O₄/Ag Nanoparticle Composites

Mn_0.25Fe_2.75O₄ nanoparticles have been successfully synthesized using the coprecipitation method. The nanoparticles are the basic components in the fabrication of Mn_0.25Fe_2.75O₄/Ag composites which have been synthesized using the chemical reduction method. To investigate the nanostructure, morphology, functional group, and specific absorption rate (SAR) value of Mn_0.25Fe_2.75O₄ nanoparticles and Mn_0.25Fe_2.75O₄/Ag composites, material has been characterized using XRD, TEM, FTIR, and magneto-thermal instruments respectively. The XRD pattern showed that Mn had been successfully substituted well in the Mn_0.25Fe_2.75O₄ nanoparticles indicated by the shift of diffraction peak towards the smaller angle of 2θ. Through Rietica analysis, the crystal sizes of Mn_0.25Fe_2.75O₄ and Ag nanoparticles were 5.40 nm and 8.05 nm respectively. This result was confirmed well by TEM characteristics which showed that the average size of Mn_0.25Fe_2.75O₄ and Ag particles as much as 5.03 nm and 8.74 nm respectively. The success of Ag nanoparticle in Mn_0.25Fe_2.75O₄/Ag composites was from the distribution of Fe-O and amine functional groups which were the representation of Mn_0.25Fe_2.75O₄ and Ag nanoparticles. Furthermore, Ag nanoparticles were relatively effective in increasing the SAR value of Mn_0.25Fe_2.75O₄/Ag composites of 0.19 W/g (without Ag) into 0.21 W/g (with 0.2 g Ag).