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Preparation, characterizations, and antibacterial properties of Cu/SnO2 nanocomposite bilayer coatings

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Abstract

A nano-bilayer structure consisting of copper and SnO2 nanocomposites was prepared by a magnetron sputtering method. A nano-SnO2 thin layer with a thickness of 52 nm was achieved on quartz glass. A nano-copper layer was then deposited on top of the SnO2 thin layer by the sputtering method. The thickness of the nano-copper layer was approximately 7 nm, such that the SnO2 layer was not only completely covered by the copper layer but it also resulted in transparent bilayer films. Post-annealing was carried out at 400°C in air for 1 h to obtain a crystalline SnO2 phase and simultaneously the copper layer was oxidized to CuO. Sputtered nanocomposites of CuO/SnO2 bilayer films showed a synergistic effect toward E. coli inactivation under indoor light exposure. A possible mechanism for the synergistic effect with respect to the antibacterial properties of CuO/SnO2 bilayer nanocomposites has been proposed. Incorporating CuO onto the SnO2 layer achieves photocatalyst works under indoor light and provides an antimicrobial function even under a dark environment by the antimicrobial property of CuO itself. Reported CuO/SnO2 sputter coating can be useful to apply, for instance, to electric devices such as touch panel displays in a hospital in order to reduce hospital-acquired infections (HAIs).

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Authors and Affiliations

  1. Nitto Denko Corporation, 1-1-2, Shimohozumi, Ibaraki, Osaka, 567-8680, Japan

    Takuya Fukumura

  2. Nitto Denko Technical Corporation, 501 Via Del Monte, Oceanside, CA, 92058, USA

    Ekambaram Sambandan

  3. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Hiromi Yamashita

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  1. Takuya Fukumura
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  2. Ekambaram Sambandan
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  3. Hiromi Yamashita
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Correspondence to Takuya Fukumura.

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Fukumura, T., Sambandan, E. & Yamashita, H. Preparation, characterizations, and antibacterial properties of Cu/SnO2 nanocomposite bilayer coatings. J Coat Technol Res 15, 437–443 (2018). https://doi.org/10.1007/s11998-017-0017-4

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  • DOI: https://doi.org/10.1007/s11998-017-0017-4

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