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Influence of Transition Elements Dopants on Physical Properties of Zinc Oxide Nanofilms

Review Paper

Abstract

Pure and doped zinc oxide nanofilms were deposited onto glass substrates by the sol–gel method. Doping can change structural, optical and magnetic properties of matter. In this research, transition elements (Fe, Co, Ni and Mn) were chosen as dopants because of their ferromagnetic property at room temperature. Structural, optical and magnetic properties of pure and doped zinc oxide were experimentally investigated. The band gap and absorption edge of nanofilms were determined, and the optical constants of films were calculated by the Cauchy formula. Transmittance spectrum, XRD diffraction and hysteresis loop were measured, and spontaneous and saturation magnetic moment of samples was calculated. Results of our measurements show Mn-doped samples are paramagnetic and the others are ferromagnetic, and band gap variation does not follow a specific pattern. Controlling dopant concentrations improves matter properties, so different Mn and Ni concentrations on ZnO nanolayers were prepared and investigated for finding out the effect of different concentrations of dopants on ZnO properties. In the case of different Mn concentrations, the band gap was decreased in low doping (Mn < 3%) and increased for high concentration (Mn > 3%), and this is due to the exchange interaction between the localized d shell electrons of the magnetic ions and the delocalized band states. Results of investigating different concentrations of Ni indicate that low Ni concentration slightly increases the band gap and high concentration of Ni leads to a decrease in the band gap. This phenomenon is due to the magnetic property of Ni and quantum confinement that can increase the band gap.

Keywords

Zinc oxide Sol–gel Nanofilm Dopant Band gap 

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Copyright information

© Shiraz University 2018

Authors and Affiliations

  1. 1.Department of PhysicsAyatollah Amoli Branch, Islamic Azad UniversityAmolIran

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