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Ag Nanoparticles Connected to the Surface of TiO 2 Electrostatically for Antibacterial Photoinactivation Studies
Author(s) -
Deshmukh Shamkumar P.,
Mullani Sajid B.,
Koli Valmiki B.,
Patil Satish M.,
Kasabe Pramod J.,
Dandge Padma B.,
Pawar Sachin A.,
Delekar Sagar D.
Publication year - 2018
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12983
Subject(s) - photocatalysis , antibacterial activity , photoluminescence , minimum bactericidal concentration , minimum inhibitory concentration , escherichia coli , transmission electron microscopy , nuclear chemistry , staphylococcus aureus , bacteria , chemistry , nanoparticle , antimicrobial , nanotechnology , band gap , materials science , catalysis , organic chemistry , biochemistry , biology , optoelectronics , gene , genetics
Supported silver nanoparticles (Ag NP s) were prepared by chemical reduction method with a sol‐gel method. The structure, morphology, and interconnectivity of Ag/TiO 2 nanocomposites ( NC s) were analyzed using different instrumental techniques. Transmission electron microscopy reveals the Ag NP s have uniformly distributed and anchored on the surface of TiO 2 . The reduction in electron‐hole recombination was measured by Photoluminescence measurements lead, to an increased photocatalytic inactivation of bacteria. Increase in the amount of Ag NP s on TiO 2 resulted in a slight decrease in optical band gap energy of TiO 2 . The effect of Ag NP s content on the photocatalytic properties of TiO 2 for inhibition of bacteria in visible light irradiation was studied. Furthermore, the antibacterial activity of Ag/TiO 2 NC s in the presence of UVA light was studied against gram‐positive Staphylococcus aureus and gram‐negative Escherichia coli bacterial strain by plate count method. Lower values of minimum inhibitory concentration ( MIC ) and minimum bactericidal concentration ( MBC ) of the catalysts were observed and used to determine the tolerance factor which is shown bactericidal nature of the NCs. Subsequently, time‐killing assay of Ag/TiO 2 NC s was shown dynamics of antimicrobial activity. These multifold antibacterial studies exhibited potent antibacterial nature of the NCs and employed in the wider range of biomedical fields.