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Effect of cobalt doping on the structural, optical and antibacterial properties of α-MnO2 nanorods

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Abstract

In this work, we have successfully synthesized pure and Cobalt (2.5% and 5%) doped-MnO2 nanorods via a simple hydrothermal route. The morphological, structural, optical, and antibacterial effects, were studied using advanced analytical techniques. The grain sizes of as-prepared nanorods, were calculated in the range of 21–26 nm. The UV–Visible absorption spectroscopy shows a broad absorption band, centered at ~ 450 nm for pure, and ~ 465 nm for cobalt-doped MnO2 nanorods, respectively. The reduction in band gap was observed from 2.36 to 1.96 eV with the increase in the dopant concentration. The antimicrobial activities of synthesized samples were studied against gram-negative (E. coli and P.aeruginosa) bacteria and a gram-positive (S.aureus) bacteria. The antimicrobial studies show inhibition zones in the range of 9–16 mm for pure and cobalt-doped MnO2. The maximum inhibition zone (MIC) was observed for 5% Co-MnO2 doping against E. coli. We believe that the synthesized nanorods can be used as antimicrobial agent, and that could be used for antibacterial drug applications.

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Acknowledgements

This research has been funded by Scientific Research Deanship at University of Ha’il-Saudi Arabia through project number (RG-20 130).

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Authors and Affiliations

  1. Department of Physics, Hazara University Mansehra, Dhodial, 21330, Pakistan

    Nadim Ullah, Arbab Mohammad Toufiq, Farman Ullah & Amjad Khan

  2. Department of Basic Sciences, College of Preparatory Year, University of Hail, Hail, Kingdom of Saudi Arabia

    Muhammad Tauseef Qureshi, Mahmoud Al Elaimi, Reda S. Abdel Hameed & Hanan Mahmoud E. Ragab

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  1. Nadim Ullah
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Correspondence to Muhammad Tauseef Qureshi.

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Ullah, N., Qureshi, M.T., Toufiq, A.M. et al. Effect of cobalt doping on the structural, optical and antibacterial properties of α-MnO2 nanorods. Appl. Phys. A 127, 779 (2021). https://doi.org/10.1007/s00339-021-04926-7

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