Room temperature investigations on optical and magnetic studies of Co x Zn 1−x S nanorods

In this report, structural optical and magnetic properties of CoxZn1−xS (x=0, 0.01, 0.05 and 0.1) nanorods have been investigated at room temperature. The average diameter and length of as synthesized nanorods, analyzed using transmission electron microscopy (TEM), are ~10nm and ~100nm, respectively. The crystal structure of CoxZn1−xS nanorods, studied using X-ray diffraction (XRD), indicates wurtzite structure with lattice parameters, a=3.84Ǻ and c=6.25Ǻ for CoxZn1−xS (x=0) nanorods which are found decreased with increased Co concentration in ZnS lattice. The band gap of Co-doped ZnS nanorods has been found to be blue shifted as compared to the undoped counterpart. Emission spectra indicate two peaks at 422nm and 485nm. Emission intensity increases in case of CoxZn1−xS (x=0.01, 0.05) nanorods, and quenches in CoxZn1−xS (x=0.1) nanorods. The ferromagnetization has been observed in case of Co-doped ZnS nanorods, whereas, undoped ZnS nanorods exhibit mixed diamagnetic-ferromagnetic behavior. The magnetization increases with increased Co concentration.