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Effects of low concentration cobalt doping on the magnetic and optical properties of Zn1-XCoXO nanorods

T. KAUR1, J. SINGH2,* , B. SINGH3,4, V. S. PANDEY3,4, G. SINGH1,5, M. K. NAYAK3,4

Affiliation

  1. Shri Guru Granth Sahib World University Fathegarh Sahib, Punjab, India
  2. Bharat Electronics Limited, Ghaziabad, India
  3. Academy of Scientific and Innovative Research, CSIR-CSIO, Chandigarh
  4. CSIR-Central Scientific Instrument Organization, Chandigarh 160030, India
  5. Lakehead University, Thunder Bay, Ontario, Canada

Abstract

A systematic investigation of the structural and optical properties of Zn1-xCoxO (x=0.002, 0.004, 0.006 and x=0.008) nanorods synthesized by sol gel, using polyvinyl alcohol as surfactant, is presented. The formation of Co doped ZnO nanorods having size 22-28 nm, with polycrystalline behavior and wurtzite structure, is confirmed by TEM and XRD analysis. Doping concentrations of Co2+ ions affects the absorbance as well as magnetic properties of Zn1-xCoxO nanorods. Optical absorption measurements show that for doping concentration of Co2+ below 1%, the bandgap has a negative correlation with the concentration. Furthermore, magnetic hysteresis curve (B-H) depicts that the behavior of Zn1-xCoxO nanorods changes from ferromagnetic to antiferromagnetic by changing the Co2+ concentration from 0.2% to 0.8%..

Keywords

Antiferromagnetic, Ferromagnetic, Nanorods, Surfactant, Wurtzite structure, Cobalt doped Zinc (ZC).

Citation

T. KAUR, J. SINGH, B. SINGH, V. S. PANDEY, G. SINGH, M. K. NAYAK, Effects of low concentration cobalt doping on the magnetic and optical properties of Zn1-XCoXO nanorods, Optoelectronics and Advanced Materials - Rapid Communications, 11, 5-6, May-June 2017, pp.364-367 (2017).

Submitted at: June 10, 2016

Accepted at: June 7, 2017