Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/63217

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dc.contributor.authorFigueiredo, Nuno M.por
dc.contributor.authorVaz, F.por
dc.contributor.authorCunha, Luíspor
dc.contributor.authorCavaleiro, Albanopor
dc.date.accessioned2020-01-13T21:06:22Z-
dc.date.available2020-01-13T21:06:22Z-
dc.date.issued2020-
dc.identifier.citationFigueiredo, N.M.; Vaz, F.; Cunha, L.; Cavaleiro, A. Au-WO3 Nanocomposite Coatings for Localized Surface Plasmon Resonance Sensing. Materials 2020, 13, 246.por
dc.identifier.issn1996-1944-
dc.identifier.urihttps://hdl.handle.net/1822/63217-
dc.description.abstractLocalized surface plasmon resonance (LSPR) gas sensors are gaining increasing importance due to their unique tuneable functional properties. Au-WO<sub>3−x</sub> nanocomposite coatings, in particular, can be outstandingly sensitive to many different gases. However, a proper understanding of their optical properties and the way in which those properties are correlated to their structure/microstructure, is still needed. In this work, Au-WO<sub>3</sub> nanocomposite coatings, with Au contents between 0–11 atomic percent, were grown using reactive magnetron co-sputtering technique and were characterized concerning their optical response. The precipitation of Au nanoparticles in the oxide matrix was promoted through thermal annealing treatments until 500 °C. Along with the Au nanoparticles’ morphological changes, the annealing treatments stimulated the crystallization of WO<sub>3</sub>, together with the appearance of oxygen-deficient WO<sub>3−x</sub> phases. Through theoretical simulations, we have related the LSPR effect with the different structural and morphological variations (namely, size and distribution of the nanoparticles and their local environment), which were a function of the Au content and annealing temperature. Our results suggest that local voids were present in the vicinity of the Au nanoparticles, for all temperature range, and that they should be present in a wide variety of Au-WO<sub>3</sub> nanocomposites. A theoretical study concerning the refractive index sensitivity was carried out in order to predict the optimal coating design parameters for gas sensing experiments.por
dc.description.sponsorshipThis research was partially sponsored by the European Regional Development Fund (ERDF), through program COMPETE-Programa Operacional Factores de Competitividade, and by national funds through the Portuguese Foundation for Science and Technology (FCT) under the projects Nanosensing (ERDF reference POCI-01-0145-FEDER-016902 and FCT reference PTDC/FIS-NAN/1154/2014), Matis (ERDF reference CENTRO-01-0145-FEDER-000014) and UID/EMS/00285/2013. The Ph.D. grant SFRH/BD/105255/2014, funded by FCT, is gratefully acknowledged as well.por
dc.language.isoengpor
dc.publisherMultidisciplinary Digital Publishing Institutepor
dc.rightsopenAccesspor
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/por
dc.subjectlocalized surface plasmon resonance (LSPR) sensingpor
dc.subjectAu-WO3 nanocompositespor
dc.subjectAu nanoparticlespor
dc.subjectrefractive index sensitivitypor
dc.subjectoptical propertiespor
dc.subjectAu-WO nanocomposites 3por
dc.titleAu-WO3 nanocomposite coatings for localized surface plasmon resonance sensingpor
dc.typearticlepor
dc.peerreviewedyespor
dc.relation.publisherversionhttps://www.mdpi.com/1996-1944/13/1/246por
oaire.citationStartPage246por
oaire.citationEndPage246por
oaire.citationIssue1por
oaire.citationVolume13por
dc.date.updated2020-01-10T09:02:02Z-
dc.identifier.doi10.3390/ma13010246por
dc.subject.fosCiências Naturais::Ciências Físicaspor
dc.subject.wosScience & Technologypor
sdum.journalMaterialspor
oaire.versionVoRpor
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