Bactericidal activity of titanium dioxide ultraviolet-induced films

TiO2 films are used as a self-sterilization surface due to their property to form reactive oxygen species (ROS) when irradiated with ultraviolet light. These ROS attack bacteria and kill them. We present a new way to enhance the bactericidal activity of TiO2-films: formation of nanopores on the surf...

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Bibliographic Details
Published inMaterials Science & Engineering C Vol. 59; pp. 807 - 817
Main Authors Pleskova, S.N., Golubeva, I.S., Verevkin, Y.K.
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.02.2016
Subjects
Anti-Bacterial Agents - chemistry
Atomic-force microscopy
Bacteria
Bactericidal activity
Elongation
Escherichia coli
Escherichia coli - growth & development
Irradiation
Nanopores
Staphylococcus aureus
Staphylococcus aureus - growth & development
Surface chemistry
TiO2 film
Titanium - chemistry
Titanium dioxide
Ultraviolet radiation
Ultraviolet Rays
PSS
UV
Atomic-force microscopy
ROS
AFM
Bacteria
XRD
Nanopores
TiO2 film
CFUs
Bactericidal activity
TiO film
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Summary:TiO2 films are used as a self-sterilization surface due to their property to form reactive oxygen species (ROS) when irradiated with ultraviolet light. These ROS attack bacteria and kill them. We present a new way to enhance the bactericidal activity of TiO2-films: formation of nanopores on the surface by four-beam high-power laser irradiation. Such surfaces have significantly higher antibacterial activity as compared to conventional TiO2 surfaces after 15 and 60min of UV irradiation. Study of the bacterial cell morphology by atomic force microscopy after 60min irradiation showed that Staphylococcus aureus 956 and Escherichia coli 321–5 undergo significant morphological changes. S. aureus assume atypical elongated shapes after UV treatment alone and swollen forms with protrusions after UV treatment on TiO2 surface. E. coli exhibit oval or round forms after UV treatment alone, and round forms with small protrusions, and destroyed cells after incubation under UV on the TiO2 film. •Nanopores on the TiO2 surface enhance the bactericidal activity of films.•The bactericidal effect of TiO2 is strain-specific.•The bacterial morphology significantly changes after UV/TiO2 treatment.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0928-4931
1873-0191
DOI:10.1016/j.msec.2015.10.021