Nanostructured 2D Diporphyrin Honeycomb Film: Photoelectrochemistry, Photodegradation, and Antibacterial Activity

ACS Appl Mater Interfaces. 2015 Jun 10;7(22):11783-91. doi: 10.1021/acsami.5b03254. Epub 2015 Jun 1.

Abstract

Surface patterns of well-defined nanostructures play important roles in fabrication of optoelectronic devices and applications in catalysis and biology. In this paper, the diporphyrin honeycomb film, composed of titanium dioxide, protoporphyrin IX, and hemin (TiO2/PPIX/Hem), was synthesized using a dewetting technique with the well-defined polystyrene (PS) monolayer as a template. The TiO2/PPIX/Hem honeycomb film exhibited a higher photoelectrochemical response than that of TiO2 or TiO2/PPIX, which implied a high photoelectric conversion efficiency and a synergistic effect between the two kinds of porphyrins. The TiO2/PPIX/Hem honeycomb film was also a good photosensitizer due to its ability to generate singlet oxygen ((1)O2) under irradiation by visible light. This led to the use of diporphyrin TiO2/PPIX/Hem honeycomb film for the photocatalytic inactivation of bacteria. In addition, the photocatalytic activities of other metal-diporphyrin-based honeycomb films, such as TiO2/MnPPIX/Hem, TiO2/CoPPIX/Hem, TiO2/NiPPIX/Hem, TiO2/CuPPIX/Hem, and TiO2/ZnPPIX/Hem, were investigated. The result demonstrated that the photoelectric properties of diporphyrin-based film could be effectively enhanced by further coupling of porphyrin with metal ions. Such enhanced performance of diporphyrin compounds opened a new way for potential applications in various photoelectrochemical devices and medical fields.

Keywords: antibacterial activity; diporphyrin; photoelectrochemistry; singlet oxygen; synergistic effect; template synthesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / chemistry*
  • Anti-Bacterial Agents / pharmacology
  • Electrochemistry
  • Escherichia coli / drug effects
  • Light
  • Nanostructures / chemistry*
  • Photolysis / drug effects*
  • Polystyrenes / chemistry
  • Polystyrenes / pharmacology
  • Porphyrins / chemistry
  • Porphyrins / pharmacology*
  • Spectrophotometry, Ultraviolet
  • Titanium / chemistry
  • Titanium / pharmacology
  • X-Ray Diffraction

Substances

  • Anti-Bacterial Agents
  • Polystyrenes
  • Porphyrins
  • titanium dioxide
  • Titanium