Sol-gel derived silver-incorporated titania thin films on glass: bactericidal and photocatalytic activity

Akgun, Betul Akkopru
Wren, Anthony W.
Durucan, Caner
Towler, Mark R.
Mellott, Nathan P.
Titanium dioxide (TiO(2)) and silver-containing TiO(2) (Ag-TiO(2)) thin films were prepared on silica pre-coated float glass substrates by a sol-gel spin coating method. The bactericidal activity of the films was determined against Staphylococcus epidermidis under natural and ultraviolet (UV) illumination by four complementary methods; (1) the disk diffusion assay, (2) UV-induced bactericidal test, (3) qualitative Ag ion release in bacteria inoculated agar media and (4) surface topographical examination by laserscan profilometry. Photocatalytic activity of the films was measured through the degradation of stearic acid under UV, solar and visible light conditions. The chemical state and distribution of Ag nanoparticles, as well as the structure of the TiO(2) matrix, and hence the bactericidal and photocatalytic activity, is controlled by post-coating calcination treatment (100-650 A degrees C). Additionally, under any given illumination condition the Ag-incorporated films were found to have superior bactericidal and photocataltyic activity performance compared to TiO(2) thin films. It is shown that with optimized thin film processing parameters, both TiO(2) and Ag-TiO(2) thin films calcined at 450 A degrees C were bactericidal and photocatalytically active.


Silver containing sol-gel derived silica thin films: effect of aluminum incorporation on optical, microstructural and bactericidal properties
Akgun, Betul Akkopru; Mellott, Nathan P.; Durucan, Caner (2012-05-01)
Silver containing silica (Ag-SiO2) thin films with and without aluminum (Al) were prepared on soda-lime-silica glass by spin coating of aqueous sols. The coating sol was formed through mixing tetraethyl orthosilicate [Si(OC2H5)(4)]/ethanol solution with aqueous silver nitrate (AgNO3) and aluminum nitrate nonahydrate [(AlNO3)(3)center dot 9H(2)O] solutions. The deposited films were calcined in air at 100, 300 and 500 A degrees C for 2 h and characterized using x-ray diffraction, UV-visible and x-ray photoele...
Effect of silver incorporation on crystallization and microstructural properties of sol-gel derived titania thin films on glass
Akgun, Betul Akkopru; Durucan, Caner; Mellott, Nathan P. (Springer Science and Business Media LLC, 2011-04-01)
Titanium dioxide (TiO(2)) thin films, with and without silver (Ag), were prepared on float glass via sol-gel processing. The float glass substrates were pre-coated with a silica-barrier layer prior to the deposition of TiO(2)-based thin films. Silver nanoparticle incorporation into the TiO(2) matrix was achieved by thermal reduction of Ag ions dissolved in a titanium-n-butoxide (Ti[O(CH(2))(3)CH(3)](4)) based sol during calcination in air at 250, 450 and 650 A degrees C. Thin films were characterized using ...
Sol-Gel processing of organically modified ITO thin films and characterization of their optoelectronic and microstructural properties
Kesim, Mehmet Tümerkan; Durucan, Caner; Department of Metallurgical and Materials Engineering (2012)
Indium tin oxide (ITO) thin films were formed on glass substrates by sol-gel method. Coating sols were prepared using indium chloride tetrahydrate (InCl3•4H2O) and tin-chloride pentahydrate (SnCl4•5H2O) stabilized in organic solvents (acetylacetone and ethanol). First attempt was to synthesize ITO thin films using standard/unmodified coating sols. The effect of calcination treatment in air (300 – 600 °C) and number of coating layer(s) (1, 4, 7 or 10) on optoelectronic properties (electrical conductivity and...
Admittance analysis of an MIS structure made with PECVD deposited a-SiNx : H thin films
Atilgan, I; Ozder, S; Ozdemir, O; Katircioglu, B (Elsevier BV, 1999-07-01)
a-SiNx:H thin films, prepared by the PECVD technique, were optically and electrically characterized. The frequency dependent trap admittance derived for the MIS structure in the accumulation gate voltage regime was revised. Based on these results an omitted multiplying factor was included into the derivation. An extension of the tunnelling model in the depletion bias regime was used in comparison with the widely accepted statistical model and finally, the more general feature of the tunnelling-based approac...
Indium tin oxide thin films elaborated by sol-gel routes: The effect of oxalic acid addition on optoelectronic properties
Kesim, Mehmet Tumerkan; Durucan, Caner (Elsevier BV, 2013-10-31)
Single layer indium tin oxide (ITO) thin films were deposited on glass using modified sol-gel formulations. The coating sols were prepared using indium (InCl3 center dot 4H(2)O) and tin salts (SnCl4 center dot 5H(2)O). The stable sols were obtained using ethanol (C2H5OH) and acetylacetone (C5H8O2) as solvents and by the addition of oxalic acid dihydrate (C2H2O4 center dot 2H(2)O) in different amounts. The effect of oxalic acid content in the sol formulation and post-coating calcination treatment (in air at ...
Citation Formats
B. A. Akgun, A. W. Wren, C. Durucan, M. R. Towler, and N. P. Mellott, “Sol-gel derived silver-incorporated titania thin films on glass: bactericidal and photocatalytic activity,” JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, pp. 228–238, 2011, Accessed: 00, 2020. [Online]. Available: