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Journal of Coatings Technology and Research

, Volume 15, Issue 2, pp 437–443 | Cite as

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

  • Takuya FukumuraEmail author
  • Ekambaram Sambandan
  • Hiromi Yamashita
Brief Communication

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).

Keywords

Antimicrobial coatings Photocatalysis Sputtering 

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Copyright information

© American Coatings Association 2018

Authors and Affiliations

  1. 1.Nitto Denko CorporationIbarakiJapan
  2. 2.Nitto Denko Technical CorporationOceansideUSA
  3. 3.Division of Materials and Manufacturing Science, Graduate School of EngineeringOsaka UniversitySuitaJapan

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