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Influence of post-deposition moisture uptake in polycarbonate on thin film's residual stress short term evolution

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dc.contributor.authorBradley, N.
dc.contributor.authorHora, J.
dc.contributor.authorHall, C.
dc.contributor.authorEvans, D.
dc.contributor.authorMurphy, P.J.
dc.contributor.authorCharrault, E.
dc.date.issued2016
dc.description.abstractThe residual stress in a thin film can have a major impact on the durability and reliability of the coated device. After deposition and upon exposure to a new environment, a coated material is subjected to various external factors that might affect its stress and thus its overall performance. To identify a protocol to measure stress in a proper and repeatable manner for films deposited on polymeric substrates, we performed ex-situ profilometry measurements on thin dielectric and metallic films (30 nm) deposited on polycarbonate substrates that were stored under different environments over a 1-2 days aging period.We observed a significant tensile transition in the film stress, characterized by an extremum and a return to an equilibrium value within the first 24 h upon atmospheric exposure. Our analyses further revealed that this phenomenon was reversible and dependent on both the relative humidity and the integrity of the thin film. The moisture uptake and subsequent water vapor diffusion within the substrate, which induces an inhomogeneous volume change in the PC and results in extrinsic bending stresses, appears to be the cause of the stress evolution. A precise control of the post-deposition environment is required to measure the residual stress of thin films deposited on polymeric substrates.
dc.identifier.citationSurface and Coatings Technology, 2016; 294:210-214
dc.identifier.doi10.1016/j.surfcoat.2016.03.092
dc.identifier.issn0257-8972
dc.identifier.orcidEvans, D. [0000-0002-1525-2249]
dc.identifier.urihttps://hdl.handle.net/11541.2/118512
dc.language.isoen
dc.publisherElsevier S.A.
dc.relation.fundingAutomotive Australia 2020 CRC AA2020CRC
dc.rightsCopyright 2016 Elsevier B.V. Access Condition Notes: Postprint available after 1 April 2018
dc.source.urihttps://doi.org/10.1016/j.surfcoat.2016.03.092
dc.subjectbarrier coating
dc.subjectmagnetron sputtering
dc.subjectmoisture uptake
dc.subjectpolymeric substrate
dc.subjectresidual stress
dc.subjectthin films
dc.titleInfluence of post-deposition moisture uptake in polycarbonate on thin film's residual stress short term evolution
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12144589910001831 13144589900001831 9916055411401831
ror.mmsid9916055411401831

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