Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/30249

TitleInfluence of thickness and coatings morphology in the antimicrobial performance of zinc oxide coatings
Author(s)Carvalho, P.
Sampaio, Paula
Azevedo, Sofia
Vaz, Catarina Oliveira
Espinós, J. P.
Teixeira, Vasco M. P.
Carneiro, Joaquim A. O.
KeywordsZnO thin films
Magnetron sputtering
Antimicrobial activity
Food packaging
Issue date2014
PublisherElsevier
JournalApplied Surface Science
Abstract(s)In this research work, the production of undoped and silver (Ag) doped zinc oxide (ZnO) thin films for food-packaging applications were developed. The main goal was to determine the influence of coatings morphology and thickness on the antimicrobial performance of the produced samples. The ZnO based thin films were deposited on PET (Polyethylene terephthalate) substrates by means of DC reactive magnetron sputtering. The thin films were characterized by optical spectroscopy, X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Scanning Electron Microscopy (SEM). The antimicrobial performance of the undoped and Ag-doped ZnO thin films was also evaluated. The results attained have shown that all the deposited zinc oxide and Ag-doped ZnO coatings present columnar morphology with V-shaped columns. The increase of ZnO coatings thickness until 200 nm increases the active surface area of the columns. The thinner samples (50 and 100 nm) present a less pronounced antibacterial activity than the thickest ones (200–600 nm). Regarding Ag-doped ZnO thin films, it was verified that increasing the silver content decreases the growth rate of Escherichia coli and decreases the amount of bacteria cells present at the end of the experiment.
TypeArticle
Description"Author's copy"
URIhttp://hdl.handle.net/1822/30249
DOI10.1016/j.apsusc.2014.04.072
ISSN0169-4332
Publisher versionwww.elsevier.com/locate/apsusc
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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