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TitleMorphology and oxygen incorporation effect on antimicrobial activity of silver thin films
Author(s)Rebelo, Rita
Manninen, N. K.
Fialho, Luísa
Henriques, Mariana
Carvalho, Sandra
KeywordsSilver nanoparticles
Silver oxide thin films
Halo tests
Issue date15-May-2016
PublisherElsevier B.V.
JournalApplied Surface Science
CitationRebelo, R.; Manninen, N. K.; Fialho, Luísa; Henriques, Mariana; Carvalho, Sandra, Morphology and oxygen incorporation effect on antimicrobial activity of silver thin films. Applied Surface Science, 371, 1-8, 2016
Abstract(s)Ag and AgxO thin films were deposited by non-reactive and reactive pulsed DC magnetron sputtering, respectively, with the final propose of functionalizing the SS316L substrate with antibacterial properties. The coatings were characterized chemically, physically and structurally. The coatings nanostructure was assessed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), while the coatings morphology was determined by scanning electron microscopy (SEM). The XRD and XPS analyses suggested that Ag thin film is composed by metallic Ag, which crystallizes in fcc-Ag phase, while the AgxO thin film showed both metallic Ag and Ag-O bonds, which crystalize in fcc-Ag and silver oxide phases. The SEM results revealed that Ag thin film formed a continuous layer, while AgxO layer was composed of islands with hundreds of nanometers surrounded by small nanoparticles with tens of nanometers. The surface wettability and surface tension parameters were determined by contact angle measurements, being found that Ag and AgxO surfaces showed very similar behavior, with all the surfaces showing a hydrophobic character. In order to verify the antibacterial behavior of the coatings, halo inhibition zone tests were realized for Staphylococcus epidermidis and Staphylococcus aureus. Ag coatings did not show antibacterial behavior, contrarily to AgxO coating, which presented antibacterial properties against the studied bacteria. The presence of silver oxide phase along with the development of different morphology were pointed as the main factors in the origin of the antibacterial effect found in AgxO thin film. The present study demonstrated that AgxO coating presented antibacterial behavior and its application in cardiovascular stents is promising.
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series
CDF - GRF - Artigos/Papers (with refereeing)
DET/2C2T - Artigos em revistas internacionais com arbitragem científica

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