Abstract
Background: Antibacterial materials are of high importance for medicine, and for the production and conservation of food. Among these materials, polymer films with metal nanoparticles (NPs) are of considerable interest for many practical applications.Results: The paper describes a novel approach for the formation of bactericidal polymer thin films (polystyrene in this case), produced by spin-coating, with Ti and Cu NPs deposited from cluster beams. Ti NPs are treated in three different ways in order to study different approaches for oxidation and, thus, efficiency in formation of the particles with semiconducting properties required for the catalytic formation of reactive oxygen species. Cu NPs are used as deposited. Partial NP embedding into polystyrene is realised in a controllable manner using thermal annealing in order to improve surface adhesion and make the particles resistant against wash-out. The formed composite films with TiOx and Cu species are tested as bactericidal media using E.coli bacteria as model microorganisms.Conclusion: The obtained results show considerable efficiency in destroying the bacteria and a good possibility of multiple re-use of the same composite films making the suggested approach attractive for the cases requiring reusable polymer-based antibacterial media.
Highlights
Certain metals, when present in excess, become destructive or lethal to organic cells
The atomic force microscopy (AFM) measurements show that the surface cluster density is not changed after the deposition of bacteria and the following washing of the samples over a few cycles of the experiments
Since the AFM measurements do not show any considerable decrease in the particle surface coverage with increased number of cycles, the reduction of antibacterial efficiency of Cu NPs can be assigned to a degradation of metallic copper and conversion to copper compounds due to the long-time exposure to environmental conditions and to the solutions used for bacteria deposition and the following washing
Summary
The paper describes a novel approach for the formation of bactericidal polymer thin films (polystyrene in this case), produced by spin-coating, with Ti and Cu NPs deposited from cluster beams. Ti NPs are treated in three different ways in order to study different approaches for oxidation and, efficiency in formation of the particles with semiconducting properties required for the catalytic formation of reactive oxygen species. Partial NP embedding into polystyrene is realised in a controllable manner using thermal annealing in order to improve surface adhesion and make the particles resistant against wash-out. The formed composite films with TiOx and Cu species are tested as bactericidal media using E.coli bacteria as model microorganisms
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