Abstract

In this work a set of x mol (x = 0.01, 0.03, 0.05, 0.07, 0.09) Yb3+ doped ZnFe2O4 nano-particles (ZnFe2-xYbxO4), were grown on a 5 wt graphene (GR) through a simple sol-gel method, using Zn(NO3)(2)center dot 6H(2)O, FeCl3 center dot 6H(2)O, Yb(NO3)(3)center dot 6H(2)O and graphene (GR). The structure, surface morphology and chemical composition of the resulting composites (ZnFe2-xYbxO4-GR) were assessed by scanning electron microscopy (SEM) with an energy dispersive X-ray (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), photoluminescence (PL) and vibrating sample magnetometry. The XRD patterns of the nano-composites and nano-particles were in good agreement with a cubic structure for the ZnFe2O4 spinel. The particle sizes for all compositions were found to be in the range of similar to 65 - 80 nm. The saturation magnetization (M-S), determined by a vibrating sample magnetometer (VSM), linearly increased with the concentration of Yb3+. Saturation magnetization (M-S) in the ZnFe2-xYbxO4-5 wt GR nano-composites was larger than that of impure 0.01 mol Yb/ZnFe2O4 nano-particles.