The effect of Mn doping on structural, magnetic and optical properties of TiO2 nanoparticles

Document Type: Original Research Paper

Authors

1 Department Physics, Faculty of science, Payamenoor University, IRAN

2 Department Physics, Faculty of science, Payamenoor University, Iran

3 department of physics, faculty of science, payamenoor university, tehran, iran

Abstract

The aim of this paper is to study the effect of Mn concentration on the structural, magnetic
and optical properties of TiO2 nanoparticles. TiO2 nanopowders with Mn concentration of 0%,
0.2%, 1% and 5% were synthesized by the sol-gel method. The structural, surface morphology
and average crystal grain size, optical, magnetic properties and chemical compounds of the
samples are studied using XRD, FE-SEM, Uv-Vis, VSM and EDX analysis respectively. The results
indicate that the samples are crystallized at anatase phase. Also, the average size of the
nanoparticles is decreased by increasing Mn doping percent. The study of the optical properties
shows that the absorption maximum dislocates toward higher wavelengths by adding Mn
to the sample. This shift may be ascribed to the enhanced trapped electron absorption caused
by the Mn-doped ions. The optical energy band gap of the doping samples shows significant
reduction rather the pure state. The samples show significant paramagnetic behavior when
the Mn concentration is 5%.

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