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Journal of Cluster Science

, Volume 29, Issue 6, pp 1255–1267 | Cite as

Structural, Magnetic, and Catalytic Properties of Mn-Doped Titania Nanoparticles Synthesized by a Sol–Gel Process

  • M. Chandra Sekhar
  • B. Purusottam Reddy
  • S. V. Prabhakar Vattikuti
  • Gnanendra Shanmugam
  • Chang-Hoi Ahn
  • Si-Hyun Park
Original Paper
  • 80 Downloads

Abstract

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.

Keywords

Structure, optical, magnetic properties Photocatalysis Antibacterial properties 

Notes

Acknowledgements

This work was supported by the 2018 Yeungnam University Research Grant.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • M. Chandra Sekhar
    • 1
    • 4
  • B. Purusottam Reddy
    • 1
  • S. V. Prabhakar Vattikuti
    • 2
  • Gnanendra Shanmugam
    • 3
  • Chang-Hoi Ahn
    • 1
  • Si-Hyun Park
    • 1
  1. 1.Department of Electronic EngineeringYeungnam UniversityGyeongsan-siRepublic of Korea
  2. 2.Department of Mechanical EngineeringYeungnam UniversityGyeongsan-siRepublic of Korea
  3. 3.Department of BiotechnologyYeungnam UniversityGyeongsan-siRepublic of Korea
  4. 4.Department of PhysicsMadanapalle Institute of Technology and ScienceMadanapalleIndia

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