The optical signature of Au nanoparticles within an yttria-stabilized zirconia matrix has been demonstrated as an optical
beacon for changes in emission gas concentrations within harsh environments. It has been proposed that this broadening
in the localized surface plasmon resonance (LSPR) band is due to the inelastic scattering of plasmons by filled oxygen
ion vacancies. Using the theoretical expressions developed by others for adsorbate induced dampening, a model has
been developed for plasmonic nanocomposites to describe the changes observed in the LSPR band broadening for
metallic nanoparticles due to the same scattering mechanisms. The model agrees with the broadening observed for the
experimental results.
Hydrogen and oxygen titration experiments have been performed for Au nanoparticles embedded in yttria-stabilized
zirconia (Au-YSZ) nanocomposites at 500 °C and characteristic localized surface plasmon resonance (LSPR) absorption
data has been acquired of the LSPR band in a variety of gas exposures. A model has been developed which attributes
peak position shift to charge exchange between the gas environment and the nanocomposite. Using the calculated charge
exchange, number of chemisorbed and incorporated oxygen ions, a qualitative description for the mechanisms dictating
the broadening of the LSPR band have been made and the trend of the experimental data leads to the conclusion that the
filled oxygen ion vacancies within the YSZ matrix for the Au-YSZ nanocomposite used in this study are at the Au
nanoparticle/YSZ interface.)
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