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Optical and magnetic properties of Co3O4/ZnO Core/Shell nanoparticles

A. ESMAIELZADEH KANDJANI1,* , S. E. HASHEMI AMIRI1, M. R. VAEZI1, S. K. SADRNEZHAAD1

Affiliation

  1. Materials and Energy Research Center (MERC), Karaj, Iran

Abstract

Co3O4/ZnO core/shell nanoparticles have been synthesized via hydrothermal/sol-gel routes. The obtained core and core/shell nanoparticles were investigated for their structures, morphologies, specific surface area, optical absorption and magnetic properties using x-ray diffraction (XRD), transition electron microscopy (TEM), Brunauer-Emmett-Teller (BET), ultraviolet-visible spectroscopy (UV-Vis) and vibrating sample magnetometer (VSM), respectively. From TEM images, it can be shown that ZnO shell has been properly formed on Co3O4 cores. Due to applying thick ZnO shells on CO3O4 cores, Co3O4 peaks were faded or just tiny peaks of them existed in core/shell XRD patterns. Also, from TEM images, the mean nanoparticle sizes for core and core/shell were estimated to be 22 and 56nm, respectively. The existence of ZnO shells on the Co3O4 nanoparticles affects the final band gap and shows a blue shift in band gap of ZnO. Also, the obtained results show that existence of Co3O4 in core of ZnO changes diamagnetic ZnO shell into weak ferromagnetic material..

Keywords

Core/Shell nanoparticles, Cobalt oxide, Zinc oxide, Soft chemical synthesis.

Submitted at: July 26, 2010
Accepted at: Oct. 14, 2010

Citation

A. ESMAIELZADEH KANDJANI, S. E. HASHEMI AMIRI, M. R. VAEZI, S. K. SADRNEZHAAD, Optical and magnetic properties of Co3O4/ZnO Core/Shell nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 10, pp. 2057-2062 (2010)