Biocidal properties of TiO2 powder modified with Ag nanoparticles

Nina Perkas, Anat Lipovsky, Galina Amirian, Yeshayahu Nitzan, Aharon Gedanken

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Silver nanoparticles (NPs) were synthesized sonochemically by the reduction of silver ions with ethylene glycol and simultaneously deposited on different forms of TiO2 powders (commercial Degussa P-25, synthetic anatase and mesoporous titania). The Ag-TiO2 nanocomposites were characterized by X-ray electron diffraction (XRD), transmission electron microscopy (TEM), energy-dispersed X-ray analysis (EDX), UV absorption spectroscopy (UV), Z-potential measurements and electron paramagnetic resonance (EPR). The results demonstrated homogeneous distribution of silver nanoparticles ∼3 nm in size, strongly attached to the surface of titania. The antimicrobial properties of Ag-TiO2 were tested against a number of Gram-positive and Gram-negative bacteria. A high bactericidal effect was found in the absence of UV light. The reduction in bacterial viability was between 3 and 4.2 logs. Based on the experimental data it was concluded that enhanced antimicrobial activity of the Ag-TiO2 originated from both the oxidative stress generated by silver nanoparticles and the presence of silver ions on the surface of the silver-titania composite.

Original languageEnglish
Pages (from-to)5309-5316
Number of pages8
JournalJournal of Materials Chemistry B
Issue number39
StatePublished - 21 Oct 2013


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