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Lasting antibacterial activities of Ag-TiO2/Ag/a-TiO2 nanocomposite thin film photocatalysts under solar light irradiation.
J Colloid Interface Sci. 2009 Aug 01; 336(1):117-24.JC

Abstract

Photodegradation of Escherichia coli bacteria in presence of Ag-TiO(2)/Ag/a-TiO(2) nanocomposite film with an effective storage of silver nanoparticles was investigated in the visible and the solar light irradiations. The nanocomposite film was synthesized by sol-gel deposition of 30 nm Ag-TiO(2) layer on approximately 200 nm anatase(a-)TiO(2) film previously doped by silver nanoparticles. Both Ag/a-TiO(2) and Ag-TiO(2)/Ag/a-TiO(2) films were transparent with a SPR absorption band at 412 nm. Depth profile X-ray photoelectron spectroscopy showed metallic silver nanoparticles with diameter of 30 nm and fcc crystalline structure were self-accumulated on the film surface at depth of 5 nm of the TiO(2) layer and also at the interface of the Ag-TiO(2) and a-TiO(2) films (at depth of 30 nm). Both OH(-) bounds and H(2)O contents were concentrated on the film surface and at the interface, as a profit in releasing more ionic (not metallic) silver nanoparticles. Antibacterial activity of the nanocomposite film against E. coli bacteria was 5.1 times stronger than activity of the a-TiO(2), in dark. Photo-antibacterial activity of the nanocomposite film exposed by the solar light was measured 1.35 and 6.90 times better than activity of the Ag/a-TiO(2) and a-TiO(2), respectively. The main mechanism for silver ion releasing was inter-diffusion of water and silver nanoparticles through pores of the TiO(2) layer. Durability of the nanocomposite film was at least 11 times higher than the Ag/a-TiO(2) film. Therefore, the Ag-TiO(2)/Ag/a-TiO(2) photocatalyst can be nominated as one of the effective and long-lasting antibacterial nanocomposite materials.

Authors+Show Affiliations

Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran. oakhavan@sharif.edu

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19394952

Citation

Akhavan, O. "Lasting Antibacterial Activities of Ag-TiO2/Ag/a-TiO2 Nanocomposite Thin Film Photocatalysts Under Solar Light Irradiation." Journal of Colloid and Interface Science, vol. 336, no. 1, 2009, pp. 117-24.
Akhavan O. Lasting antibacterial activities of Ag-TiO2/Ag/a-TiO2 nanocomposite thin film photocatalysts under solar light irradiation. J Colloid Interface Sci. 2009;336(1):117-24.
Akhavan, O. (2009). Lasting antibacterial activities of Ag-TiO2/Ag/a-TiO2 nanocomposite thin film photocatalysts under solar light irradiation. Journal of Colloid and Interface Science, 336(1), 117-24. https://doi.org/10.1016/j.jcis.2009.03.018
Akhavan O. Lasting Antibacterial Activities of Ag-TiO2/Ag/a-TiO2 Nanocomposite Thin Film Photocatalysts Under Solar Light Irradiation. J Colloid Interface Sci. 2009 Aug 1;336(1):117-24. PubMed PMID: 19394952.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Lasting antibacterial activities of Ag-TiO2/Ag/a-TiO2 nanocomposite thin film photocatalysts under solar light irradiation. A1 - Akhavan,O, Y1 - 2009/03/31/ PY - 2008/12/15/received PY - 2009/02/18/revised PY - 2009/03/20/accepted PY - 2009/4/28/entrez PY - 2009/4/28/pubmed PY - 2009/8/22/medline SP - 117 EP - 24 JF - Journal of colloid and interface science JO - J Colloid Interface Sci VL - 336 IS - 1 N2 - Photodegradation of Escherichia coli bacteria in presence of Ag-TiO(2)/Ag/a-TiO(2) nanocomposite film with an effective storage of silver nanoparticles was investigated in the visible and the solar light irradiations. The nanocomposite film was synthesized by sol-gel deposition of 30 nm Ag-TiO(2) layer on approximately 200 nm anatase(a-)TiO(2) film previously doped by silver nanoparticles. Both Ag/a-TiO(2) and Ag-TiO(2)/Ag/a-TiO(2) films were transparent with a SPR absorption band at 412 nm. Depth profile X-ray photoelectron spectroscopy showed metallic silver nanoparticles with diameter of 30 nm and fcc crystalline structure were self-accumulated on the film surface at depth of 5 nm of the TiO(2) layer and also at the interface of the Ag-TiO(2) and a-TiO(2) films (at depth of 30 nm). Both OH(-) bounds and H(2)O contents were concentrated on the film surface and at the interface, as a profit in releasing more ionic (not metallic) silver nanoparticles. Antibacterial activity of the nanocomposite film against E. coli bacteria was 5.1 times stronger than activity of the a-TiO(2), in dark. Photo-antibacterial activity of the nanocomposite film exposed by the solar light was measured 1.35 and 6.90 times better than activity of the Ag/a-TiO(2) and a-TiO(2), respectively. The main mechanism for silver ion releasing was inter-diffusion of water and silver nanoparticles through pores of the TiO(2) layer. Durability of the nanocomposite film was at least 11 times higher than the Ag/a-TiO(2) film. Therefore, the Ag-TiO(2)/Ag/a-TiO(2) photocatalyst can be nominated as one of the effective and long-lasting antibacterial nanocomposite materials. SN - 1095-7103 UR - https://www.unboundmedicine.com/medline/citation/19394952/Lasting_antibacterial_activities_of_Ag_TiO2/Ag/a_TiO2_nanocomposite_thin_film_photocatalysts_under_solar_light_irradiation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9797(09)00299-9 DB - PRIME DP - Unbound Medicine ER -