Electroless controllable growth of ZnO films and their morphology-dependent antimicrobial properties

[Display omitted] •Growth of ZnO films through a simple deposition route at low temperature.•The surface morphology was easily fine-tuned by modifying deposition temperature.•Morphology and polar planes of ZnO films are important for antimicrobial response.•Films showed high antimicrobial action aga...

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Bibliographic Details
Published in:Journal of hazardous materials 2018-04, Vol.347, p.39-47
Main Authors: Ruíz-Gómez, M.A., Figueroa-Torres, M.Z., Alonso-Lemus, I.L., Vega-Becerra, O.E., González-López, J.R., Zaldívar-Cadena, A.A.
Format: Article
Language:English
Subjects:
Agar diffusion method
Glass substrate
Nanocoating
Time-kill test
Transparent films
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Summary:[Display omitted] •Growth of ZnO films through a simple deposition route at low temperature.•The surface morphology was easily fine-tuned by modifying deposition temperature.•Morphology and polar planes of ZnO films are important for antimicrobial response.•Films showed high antimicrobial action against S. aureus and E. coli bacteria.•ZnO films maintain high antimicrobial efficiency even after 15 h of test in dark. An electroless deposition process was used to synthesize with a controlled morphology, polycrystalline ZnO on glass substrates as antimicrobial coatings. The influence of deposition temperature (Tdep) on the physicochemical and antimicrobial properties of the ZnO films was analyzed. The results indicated that a change in deposition temperature greatly affected the morphology and the degree of crystallinity of the films. Scanning electron microscope images show that the film surface is porous at a deposition temperature of 40 and 50 °C, whereas hexagonal-plate shaped morphology predominated at 60 °C and finally at 70 and 80 °C the films consisted of rod-like particles. The films showed good transparency in the visible region. All ZnO films presented notable antimicrobial activity against the gram-negative bacteria Escherichia coli (E. coli) and the gram-positive Staphylococcus aureus (S. aureus). It was found that the antimicrobial efficiency is strongly dependent on morphology and structural properties. The best antimicrobial performance was recorded for the films consisting of rod-like morphology with a high degree of crystallinity. The procedure used in this investigation is strongly recommended for the development of functional surfaces.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2017.12.039