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TitleNanocomposite thin films based on Au-Ag nanoparticles embedded in a CuO matrix for localized surface plasmon resonance sensing
Author(s)Proença, Maria Manuela Carvalho
Borges, Joel Nuno Pinto
Rodrigues, Marco S.
Meira, Diana Isabela Faria
Sampaio, Paula
Dias, João P.
Pedrosa, Paulo Eduardo Teixeira Baptista
Martin, Nicolas
Bundaleski, Nenad
Teodoro, Orlando M.N.D.
Vaz, F.
KeywordsThin films
Magnetron sputtering deposition
CuO matrix
Localized surface plasmon resonance
Issue date2019
JournalApplied Surface Science
Abstract(s)Nanocomposite thin films, composed of monometallic Au and Ag, and bimetallic AuAg nanoparticles, dispersed in a CuO matrix were prepared, characterised and tested for Localized Surface Plasmon Resonance (LSPR) sensing. The films were deposited by reactive magnetron sputtering, followed by a post-deposition thermal annealing to modify the size and shape of the nanoparticles distribution within the oxide matrix. Regarding the main results of the monometallic systems, the Au:CuO films showed LSPR bands from 800 nm to 650 nm, which reveal a progressive narrowing and a continuous blue-shift with increasing temperature (400–700 °C). The Ag:CuO films evidenced plasmonic bands at about 400 nm for temperatures of 500 °C and above. The bimetallic system, Au-Ag:CuO, showed LSPR bands in the range between those of the corresponding monometallic systems, due to the presence of Ag enriched AuAg alloy nanoparticles, taking part of Janus-like structures in some cases. In terms of LSPR sensing, Au:CuO films revealed the highest values of refractive index sensitivity since the nanoparticles are more exposed to the surrounding environment.
Description"Available online 08 April 2019"
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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