Extracellular Electron Transfer from Aerobic Bacteria to Au-Loaded TiO2 Semiconductor without Light : A New Bacteria-Killing Mechanism Other than Localized Surface Plasmon Resonance or Microbial Fuel Cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hongqing Feng
  • Qi Hao
  • Weihong Jin
  • Guosong Wu

Detail(s)

Original languageEnglish
Pages (from-to)24509-24516
Journal / PublicationACS Applied Materials and Interfaces
Volume8
Issue number37
Online published31 Aug 2016
Publication statusPublished - 21 Sep 2016

Abstract

Titania loaded with noble metal nanoparticles exhibits enhanced photocatalytic killing of bacteria under light illumination due to the localized surface plasmon resonance (LSPR) property. It has been shown recently that loading with Au or Ag can also endow TiO2 with the antibacterial ability in the absence of light. In this work, the antibacterial mechanism of Au-loaded TiO2 nanotubes (Au@TiO2−NT) in the dark environment is studied, and a novel type of extracellular electron transfer (EET) between the bacteria and the surface of the materials is observed to cause bacteria death. Although the EET-induced bacteria current is similar to the LSPRrelated photocurrent, the former takes place without light, and no reactive oxygen species (ROS) are produced during the process. The EET is also different from that commonly attributed to microbial fuel cells (MFC) because it is dominated mainly by the materials’ surface, but not the bacteria, and the environment is aerobic. EET on the Au@TiO2−NT surface kills Staphylococcus aureus, but if it is combined with special MFC bacteria, the efficiency of MFC may be improved significantly.

Research Area(s)

  • antibacterial properties, Au-loaded TiO2 nanotubes, extracellular electron transfer, localized surface plasmon resonance, microbial fuel cells, reactive oxygen species free

Citation Format(s)

Extracellular Electron Transfer from Aerobic Bacteria to Au-Loaded TiO2 Semiconductor without Light : A New Bacteria-Killing Mechanism Other than Localized Surface Plasmon Resonance or Microbial Fuel Cells. / Wang, Guomin; Feng, Hongqing; Gao, Ang et al.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 37, 21.09.2016, p. 24509-24516.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review