Defect induced room-temperature ferromagnetism and enhanced photocatalytic activity in Ni-doped ZnO synthesized by electrodeposition

Abstract

Zn0.90Ni0.10O nanoparticles have been synthesized by single bath two electrode electrodeposition at constant voltage. X-ray diffraction, U-V Vis and Photoluminescence studies reveal that a single-phase polycrystalline hcp wurtzite crystal structure of ZnO has evolved. The material consists of a large number of defects like oxygen vacancy (Ov) and Zinc interstitial (Zi). The magnetization study reveals that the sample exhibit room temperature global ferromagnetism and the ferromagnetic ordering seems to be defect induced via bound magnetic polaron mechanism and double exchange also is expected to have played role. Interesting optoelectronic properties have been found in the synthesized sample and the material seems to be a potential candidate to be used as U-V sensor. Such transition metal doped ZnO based dilute magnetic semiconducting systems exhibiting room temperature ferromagnetism is likely to be first of its kind in the sense that such materials have not still been reported to be synthesized by simple method of electrodeposition to the best of the knowledge of the authors on the basis of ample literature review.