Journal
NANOMATERIALS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nano11123331
Keywords
hybrid nanostructures; quantum dots; photo-induced electron transfer; reactive oxygen species; antibacterial activity
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Titania nanoparticle/CdSe quantum dot hybrid structures efficiently generate superoxide anions under visible light and exhibit significant bactericidal effects against various bacterial strains, particularly inhibiting growth of a photosensitive causative agent model of tuberculosis.
Titania nanoparticle/CdSe quantum dot hybrid structures are a promising bactericidal coating that exhibits a pronounced effect against light-sensitive bacteria. Here, we report the results of a comprehensive study of the photophysical properties and bactericidal functionality of these hybrid structures on various bacterial strains. We found that our structures provide the efficient generation of superoxide anions under the action of visible light due to electron transfer from QDs to titania nanoparticles with ~60% efficiency. We also tested the antibacterial activity of hybrid structures on five strains of bacteria. The formed structures combined with visible light irradiation effectively inhibit the growth of Escherichia coli, Bacillus subtilis, and Mycobacterium smegmatis bacteria, the last of which is a photosensitive causative agent model of tuberculosis.
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