Structural optical and magnetic properties of transition metal doped ZnO magnetic nanoparticles synthesized by sol-gel auto-combustion method

• DOI: 10.2478/msp-2019-0029
• Publication Date: 2019-06-13T09:14:23Z
• Authors: Madiha Sarfraz; Nasar Ahmed; Khizar-ul-Haq; Shabnam Shahida; M. A. Khan
• Keywords: Wurtzite crystal structure

Abstract Transition metals, such as chromium (Cr) and manganese (Mn) doped zinc oxide (ZnO) magnetic nanoparticles, were synthesized via sole gel auto-combustion method. The prepared (Zn 1−(x+y) Mn x Cr y O, where x, = 0, 0.02, 0.075) nanoparticles calcined in an oven at 6000 °C for 2 hours. morphologies of the investigated using different techniques. X-ray diffraction (XRD) analysis revealed that hexagonal wurtzite structure was unaffected by doping concentration. crystallite size measured Scherrer formula range 32 nm to 38 concentrations. Nanosized particles with well-defined boundaries observed a field emission scanning electron microscopy (FE-SEM). Fourier transform infrared (FT-IR) spectra showed wide absorption band around 1589 cm −1 all samples, corresponding stretching vibration oxygen Zn–O bond. A blue shift optical gaps from 3.20 eV ZnO 3.08 Zn 0.85 0.075 O diffuse reflectance spectra, which attributed sp-d exchange interactions. field-dependent magnetization M-H loops vibrating sample magnetometer (VSM). VSM results diamagnetic behavior changed into ferromagnetic, depending on concentration particle size. compositions Zn, Cr, samples confirmed energy dispersive spectroscopy (EDX). Our provided interesting route improve properties may get significant attention fabrication semiconductors.