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Open AccessFeature PaperArticle

Gas Sensing with Nanoplasmonic Thin Films Composed of Nanoparticles (Au, Ag) Dispersed in a CuO Matrix

Centro de Física da Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Coatings 2019, 9(5), 337; https://doi.org/10.3390/coatings9050337
Received: 6 May 2019 / Revised: 22 May 2019 / Accepted: 23 May 2019 / Published: 25 May 2019
(This article belongs to the Special Issue Advanced Strategies in Thin Film Engineering by Magnetron Sputtering)
Magnetron sputtered nanocomposite thin films composed of monometallic Au and Ag, and bimetallic Au-Ag nanoparticles, dispersed in a CuO matrix, were prepared, characterized, and tested, which aimed to find suitable nano-plasmonic platforms capable of detecting the presence of gas molecules. The Localized Surface Plasmon Resonance phenomenon, LSPR, induced by the morphological changes of the nanoparticles (size, shape, and distribution), and promoted by the thermal annealing of the films, was used to tailor the sensitivity to the gas molecules. Results showed that the monometallic films, Au:CuO and Ag:CuO, present LSPR bands at ~719 and ~393 nm, respectively, while the bimetallic Au-Ag:CuO film has two LSPR bands, which suggests the presence of two noble metal phases. Through transmittance-LSPR measurements, the bimetallic films revealed to have the highest sensitivity to the refractive index changes, as well as high signal-to-noise ratios, respond consistently to the presence of a test gas. View Full-Text
Keywords: thin films; magnetron sputtering; microstructure; noble metal nanoparticles; CuO matrix; localized surface plasmon resonance; gas sensor thin films; magnetron sputtering; microstructure; noble metal nanoparticles; CuO matrix; localized surface plasmon resonance; gas sensor
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MDPI and ACS Style

Proença, M.; Rodrigues, M.S.; Borges, J.; Vaz, F. Gas Sensing with Nanoplasmonic Thin Films Composed of Nanoparticles (Au, Ag) Dispersed in a CuO Matrix. Coatings 2019, 9, 337.

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