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|Title:||Nanocomposite 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
Dias, João P.
Pedrosa, Paulo Eduardo Teixeira Baptista
Teodoro, Orlando M.N.D.
Magnetron sputtering deposition
Localized surface plasmon resonance
|Journal:||Applied 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"|
|Access:||Restricted access (UMinho)|
|Appears in Collections:||CDF - GRF - Artigos/Papers (with refereeing)|
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