Micellar layer-by-layer synthesis of TiO2/Ag hybrid particles for bactericidal and photocatalytic activities

Wei Cheng Lin, Chun Nan Chen, Tzu Tsung Tseng, Ming Hsiung Wei, J. H. Hsieh, Wenjea J. Tseng*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

54 Scopus citations


Silver nanoparticles prepared by a reverse micelle process were sequentially deposited on rutile-structured TiO2 particles via an electrostatic layer-by-layer (LbL) deposition together with a hydrophilic/hydrophobic interaction. The TiO2 surface was first mediated by a preferential adsorption of poly(allylamine hydrochloride) (PAH) cationic molecules, before being mixed with the Ag nanoparticles encapsulated in reverse micelles consisting of anionic surfactant of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in isooctane. The deposition of Ag nanoparticles was not of a uniform coverage on the TiO2 surface, but of a heterogeneous growth of the Ag particles on the TiO2 surface. Antibacterial activity of the composites against gram-negative bacteria, i.e., Escherichia coli (E. coli), was found to increase with the deposition cycle, resulted mainly from the increased Ag concentration. The bactericidity is persistent in the absence of ultraviolet (UV) light. Over the concentration range of Ag examined, i.e., Ag/Ti atomic ratio varies from 0.28% to 0.53%, photocatalytic efficiency of the composites against methylene blue (MB) dye in an aqueous solution also improved pronouncedly with the silver concentration under UV exposure.

Original languageEnglish
Pages (from-to)2849-2857
Number of pages9
JournalJournal of the European Ceramic Society
Issue number14
StatePublished - 10 2010
Externally publishedYes


  • Ag
  • Antibacterial
  • Composite
  • Photocatalysis
  • TiO


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