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 journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 24509-24516 |
Journal / Publication | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 37 |
Online published | 31 Aug 2016 |
Publication status | Published - 21 Sep 2016 |
Link(s)
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 journal › peer-review