Emerging pathways in electrical, magnetic and thermoelectric performance of different concentration of iron doped cobalt oxide nanoparticles

Abstract

Current study was reported that to tune the magnetic, electrical and thermoelectric properties of Co₃O₄NPs by using different concentration of iron (0, 3 and 5 wt%). The Fe doped Co₃O₄ NPs were synthesized by using co-precipitation method. The XRD was use to identify the cubic spinel structure and crystallite size range from 15 to 24 nm. The porous like surface morphology changed into tiny spherical grain with 5 % Fe doped Co₃O₄ NPs was observed via SEM micrographs. After that the presence of CoO, FeO, CO, CO₂ and OH was identify with the help of FTIR analysis. In addition, VSM analysis shows that magnetization increase (20.918 E-3 to 73.843E-3 emu), corecivity, retentivity and ferromagnetic behavior decreased by increasing Fe concentration in Co₃O₄ NPs. Further, two probe method was used to examine the relation between resistivity and conductivity. It was observed that the resistivity decreases (9 $\times$ 10³ to 3 $\times$ 10³ Ω m) and conductivity increased (1.1$\times$ 10^-4 to 3.3$\times$ 10^-4 Ω^-1m⁻¹) upto significant level. Finally, thermoelectric property was identified to calculate seebeck coefficient and power factor. Thermoelectric result shows that due to increase the distance between source and substrate then seebeck coefficient and power factor increased. The seebeck coefficient values indicated that due to decrease the resistivity the carrier concentration increase upto significant value at optimum temperature. The synthesized nano-material will be suitable for spintronic devices, supercapacitor for electrode material and temperature sensors.