Structural, Magnetic, and Catalytic Properties of Mn-Doped Titania Nanoparticles Synthesized by a Sol–Gel Process
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TiO2 nanoparticles (NPs) doped with different concentrations of manganese (1–8 at.%) were synthesized by sol–gel method and characterized to determine their structure, optical, and magnetic properties. X-ray diffraction analysis confirmed the formation of Mn-doped TiO2 NPs with anatase structure and that no impurity phases were present. X-ray photoelectron spectroscopic data indicated that the amount of Mn in the doped TiO2 samples was slightly lower than the theoretical value, and scanning electron microscope images illustrated a morphology consisting of un-aggregated, well-arranged NPs with a homogeneous size distribution. Particle sizes determined from transmission electron microscope images were found to be 17 and 11 nm for pure and Mn-doped TiO2, respectively. The band gap for pure TiO2 was calculated to be 3.26 eV from ultraviolet–visible reflectance spectra, which decreased to 2.70 eV following 8% Mn-doping. The as-prepared pure TiO2 NPs were found to be weakly paramagnetic at room temperature from vibrating sample magnetometer; however, a transformation from paramagnetic to weak ferromagnetism at room temperature was observed for Mn-doped TiO2 (5 at.%) NPs. Mn doped TiO2 (5 at.%) NPs exhibited the higher antibacterial activity against Bacillus subtilis, Escherichia coli and Pseudomonas aeruginosa than the pure TiO2 NPs.
KeywordsStructure, optical, magnetic properties Photocatalysis Antibacterial properties
This work was supported by the 2018 Yeungnam University Research Grant.
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