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Investigation of physical and antibacterial characteristics of ZnCo2O4 semiconductor films

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Abstract

A ZnCo2O4 film is prepared using the sol–gel method. The sample is subjected to heat treatment under nitrogen at 200–600 °C. When the sample is annealed at 200 °C, it exhibits an amorphous Zn–Co–O film with low surface roughness, high light transmittance, and no conductivity. When the sample is annealed at 250 °C, a spinel ZnCo2O4 film is formed. With a gradual increase in temperature to 600 °C, the degree of crystal order, crystal size, surface polygonal structure, and root mean square roughness of the ZnCo2O4 film increase. The transmittances of the spinel ZnCo2O4 are 58.98–43.68% at a wavelength of 550 nm, which indicate a translucent characteristic. For the films annealed at 300 and 350 °C, the film resistivities are 8.22 and 24.26 Ω cm, respectively, and the corresponding carrier concentrations are 2.98 × 1018 and 2.48 × 1018 cm−3. The ZnCo2O4 film is a p-type semiconductor. The ZnCo2O4 film exhibits high antibacterial properties against both Escherichia coli and Staphylococcus aureus under bright and dark conditions (no photocatalysis), with antibacterial rates of 99.86% to 99.99%. Therefore, ZnCo2O4 demonstrates immense potential for antibacterial and optoelectronic applications.

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Acknowledgements

We thank the China Medical University Hospital and China Medical University for financial support for this research under Contract No. ASIA-106-CMUH-09 and DMR-106-048.

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Authors and Affiliations

  1. Department of Infectious Diseases, School of Medicine, China Medical University Hospital and Children Hospital, China Medical University, Taichung, 40402, Taiwan

    Kao-Pin Hwang

  2. Department of Neonatology, China Medical University Children’s Hospital, Taichung, 40402, Taiwan

    Hung-Chih Lin

  3. Asia University Hospital, Taichung, 41354, Taiwan

    Hung-Chih Lin

  4. Department of Computer Science and Information Engineering, Asia University, 500 Lioufeng Rd., Wufeng, Taichung, 41354, Taiwan

    Ming-Han Zham & Ruei-Sung Yu

  5. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan

    Ruei-Sung Yu

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  1. Kao-Pin Hwang
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  2. Hung-Chih Lin
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  4. Ruei-Sung Yu
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Correspondence to Ruei-Sung Yu.

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Hwang, KP., Lin, HC., Zham, MH. et al. Investigation of physical and antibacterial characteristics of ZnCo2O4 semiconductor films. J Mater Sci: Mater Electron 33, 2173–2182 (2022). https://doi.org/10.1007/s10854-021-07424-x

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  • DOI: https://doi.org/10.1007/s10854-021-07424-x

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