The effect of annealing time and gas flow rate on optical and magnetic properties of (Al,Co) co-doped ZnO nanoparticles by varying Al concentration

Authors

  • S. Qaseem Department of Physics, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal Campus, Karachi, Pakistan
  • M. Naeem Department of Physics, University of Karachi, Karachi, Pakistan
  • M. Ikram Department of Physics, Hazara University, 21300 Mansehra, Pakistan
  • Rubab Zahra

DOI:

https://doi.org/10.52700/jn.v2i1.25

Keywords:

Diluted magnetic semiconductors, RTFM, Nanoparticles, Gas flow rate, Forming gas atmosphere

Abstract

The effect of Al, a trivalent substitution was investigated in Co doped ZnO with regards to the role of additional carriers in n-type magnetic semiconductors. Nanoparticle samples of Zn1?xCo0.04AlxO with different Al compositions (x = 0, 0.005, 0.010, 0.015 and 0.020) were annealed at 600 oC for different time (5 hours and 8 hours) and different gas flow rates (25 sccm and 50 sccm). All nanoparticles attained Wurtzite hexagonal structure in a stable form after annealing in forming gas. The effect of annealing time and gas pressure were investigated. Magnetization measurements revealed that air annealed samples displayed paramagnetic properties. Nevertheless, after annealing in forming gas, magnetic moments are stabilized and follow a monotonic trend. Diffuse reflectivity measurements revealed the incorporation of Co2+ ions into the Wurtzite hexagonal lattice. The optical band-gap was found to be increasing with increasing Al concentration of up to 0.01, followed by a decrease with further increase in Al concentration

Published

2021-06-30

How to Cite

Qaseem, S. ., Naeem, M. ., Ikram, M., & Zahra, R. (2021). The effect of annealing time and gas flow rate on optical and magnetic properties of (Al,Co) co-doped ZnO nanoparticles by varying Al concentration. JOURNAL OF NANOSCOPE (JN), 2(1), 1-13. https://doi.org/10.52700/jn.v2i1.25