Nanocomposite thin films based on Au-Ag nanoparticles embedded in a CuO matrix for localized surface plasmon resonance sensing

Manuela Proença, Joel Borges, Marco S. Rodrigues, Diana I. Meira, Paula Sampaio, João P. Dias, Paulo Pedrosa, Nicolas Martin, Nenad Bundaleski, Orlando M. N. D. Teodoro, Filipe Vaz

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Nanocomposite thin films, composed of monometallic Au and Ag, and bimetallic Au[sbnd]Ag 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 Au[sbnd]Ag 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.

Original languageEnglish
Pages (from-to)152-168
Number of pages17
JournalApplied Surface Science
Volume484
DOIs
Publication statusPublished - 1 Aug 2019

Keywords

  • CuO matrix
  • Localized surface plasmon resonance
  • Magnetron sputtering deposition
  • Microstructure
  • Nanoparticles
  • Thin films

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