Nanomedicine: Nanotechnology, Biology and Medicine
Volume 2, Issue 2 , Pages 121-126, June 2006

Antibacterial performance of photocatalyst thin film fabricated by defection effect in visible light

  • Kuan-Jiunn Shieh, MS

      Affiliations

    • Department of Chemistry, Chinese Military Academy, Kaohsiung, Taiwan
    • ,
  • Min Li, PhD

      Affiliations

    • Nanowin Technology Co., LTD, Tainan, Taiwan
    • ,
  • Yu-Hwe Lee, PhD

      Affiliations

    • Department of Information Management, Nan Jeon Institute of Technology, 737 Tainan, Taiwan
    • ,
  • Shinn-Der Sheu, PhD

      Affiliations

    • Department of Information Management, Nan Jeon Institute of Technology, 737 Tainan, Taiwan
    • ,
  • Yu-Tsung Liu, MS

      Affiliations

    • General Education Center, Nan Jeon Institute of Technology, Tainan, Taiwan
    • ,
  • Yau-Chyr Wang, PhD

      Affiliations

    • Department of Information Management, Nan Jeon Institute of Technology, 737 Tainan, Taiwan
    • Corresponding Author InformationCorresponding author. Department of Information Management, Nan Jeon Institute of Technology, No. 178, Chau-Chin Road, Yen-Shui, 737 Tainan, Taiwan.

Received 30 December 2005; accepted 12 April 2006.

Abstract 

We have developed a new photocatalyst thin film that has strong antibacterial action in visible light. In this study the radiofrequency (RF) sputter technique was used to deposit a defective titanium dioxide (TiOx, x < 2) photocatalyst thin film (120 nm thickness) on glass and steel substrates. In the ultraviolet (UV)-visible spectrum analysis, the defective TiOx thin film was found to generate the red shift effect. To determine whether the defective TiOx thin film has antibacterial ability under visible light, we designed a series of experiments according to the Japanese Industrial Standards (JIS) Committee standard for testing antibacterial performance and for exploring the impact of surface roughness of substrate. Our results show that the antibacterial performance rate against Escherichia coli could reach 99.99% in visible light. We also proved that the coating technology can be applied effectively to surfaces with different degrees of roughness. It is suitable for protecting both human health and the natural environment.

Key words: Photocatalyst, RF sputter technique, Defective TiOx thin films, Escherichia coli

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 This work was supported by the National Science Council of the Republic of China under Contract No. NSC 93-2112-M-232-001.

 No financial conflict of interest was reported by the authors of this paper.

PII: S1549-9634(06)00041-4

doi:10.1016/j.nano.2006.04.001

Nanomedicine: Nanotechnology, Biology and Medicine
Volume 2, Issue 2 , Pages 121-126, June 2006

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