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dc.contributor.authorMeira, Diana Isabela Fariapor
dc.contributor.authorDomingues, Rui P.por
dc.contributor.authorRodrigues, Marco S.por
dc.contributor.authorAlves, Eduardopor
dc.contributor.authorBarradas, Nuno P.por
dc.contributor.authorBorges, Joel Nuno Pintopor
dc.contributor.authorVaz, F.por
dc.identifier.citationMeira, D. I., Domingues, R. P., Rodrigues, M. S., et. al.(2020). Thin films of Au-Al2O3 for plasmonic sensing. Applied Surface Science, 500, 144035.por
dc.description.abstractThis works reports on the development of nanoplasmonic thin films, composed of Au nanoparticles embedded in an Al2O3 matrix. The Au-Al2O3 thin films were deposited by magnetron sputtering, and then subjected to thermal treatments (in-air) to promote the growth of the Au nanoparticles. The change of the number of gold pellets placed in the erosion zone of the aluminium target, originated Au concentrations in the films from 8.9 at.% to 20.7 at.%. While the Al2O3 matrix remained roughly stoichiometric and amorphous after the thermal treatment, a progressive crystallization of the Au nanoparticles was observed when the annealing temperature increased from 400 °C to 700 °C. Nonetheless, the amorphous matrix limited the growth of Au nanoparticles up to 20 nm. Moreover, the application of an argon plasma treatment enabled the removal of superficial layers, increasing the density of Au nanoparticles partially exposed at the films’ surface. Envisaging the application in localized surface plasmon resonance sensors, the thin films were tested using two dielectric (liquid) environments, showing a consistent response under different H2O/DMSO cycles, yet with low sensitivities (few nm/RIU). To enhance the sensitivity of these thin film system other strategies are discussedpor
dc.description.sponsorshipThis work was supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Funding UID/FIS/04650/2019; and by the projects NANOSENSING POCI-01-0145-FEDER-016902, with FCT reference PTDC/FIS-NAN/1154/2014; and project NANO4BIO POCI-01-0145-FEDER-032299, with FCT reference PTDC/FIS-MAC/32299/2017. Diana I. Meira acknowledges FCT for her PhD Scholarship, SFRH/BD/143262/2019. Marco S. Rodrigues also acknowledges FCT for his PhD Scholarship, SFRH/BD/118684/2016. Joel Borges acknowledges FCT for his Researcher Contract from project NANO4BIO, CTTI-149/18-CF(1).por
dc.subjectThin filmspor
dc.subjectMagnetron sputteringpor
dc.subjectLocalized surface plasmon resonancepor
dc.subjectAu nanoparticlespor
dc.subjectAl2O3 matrixpor
dc.subjectPlasmonic sensingpor
dc.titleThin films of Au-Al2O3 for plasmonic sensingpor
dc.subject.fosCiências Naturais::Ciências Físicaspor
dc.subject.fosEngenharia e Tecnologia::Engenharia dos Materiaispor
dc.subject.fosEngenharia e Tecnologia::Nanotecnologiapor
sdum.journalApplied Surface Sciencepor
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