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Effect of plasma coating on antibacterial activity of silver nanoparticles

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)75-82
Number of pages8
JournalThin Solid Films
Volume672
Early online date31 Dec 2018
DOIs
Publication statusPublished - 28 Feb 2019
Publication typeA1 Journal article-refereed

Abstract

Silver nanoparticles (NPs) are known to provide antimicrobial properties for surfaces. However, there are environmental concerns due to reports of toxicity after exposure to the environment during or after end-use. Immobilizing silver NPs to the surface of substrates could ensure that particles are readily available for antibacterial activity with limited environmental exposure. A plasma coating on top of silver NPs could improve the adhesion of NPs to a substrate, but it could also impede the release of silver NPs completely. Furthermore, silver has been shown to require direct contact to demonstrate antibacterial activity. This study demonstrates immobilization of silver NPs with plasma coating onto a surface while maintaining its antibacterial properties. Silver NPs are simultaneously synthesized and deposited onto a surface with liquid flame spray aerosol technique followed by hexamethyldisiloxane plasma coating to immobilize the NPs. Atomic force microscope scratch testing is used to demonstrate improved nanoparticle adhesion. Antibacterial activity against gram-negative Escherichia coli is maintained even for plasma coating thicknesses of 195 nm. NP adhesion to the surface is significantly improved. Gram-positive Staphylococcus aureus was found be resistant to all the plasma-coated samples. The results show promise of using plasma coating technology for limiting NP exposure to environment.

Keywords

  • Liquid flame spray, Silver, Nanoparticles, Plasma coating, Antibacterial effects, Hexamethyldisiloxane, Scratch test

Publication forum classification

Field of science, Statistics Finland