Pairs of samples containing Ag nanoparticles (NPs) of different dimensions have been produced under the same conditions but on different substrates, namely standard glass slides and a thin layer of amorphous aluminum oxide (a-Al 2 O 3 ) on-glass. Upon storage in ambient conditions (air and room temperature) the color of samples changed and a blue-shift and damping of the surface plasmon resonance was observed. The changes are weaker for the samples on-glass and tend to saturate after 12 months. In contrast, the changes for the samples on a-Al 2 O 3 appear to be still progressing after 25 months. While x-ray photoelectron spectroscopy shows a slight sulfurization and negligible oxidation of the Ag for the on-glass samples upon 25 months aging, it shows that Ag is strongly oxidized for the on a-Al 2 O 3 samples and sulfurization is negligible. Both optical and chemical results are consistent with the production of a shell at ...
R J Peláez, A Castelo, C N Afonso, A Borrás, J P Espinós, S Riedel, P Leiderer and J Boneberg
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R J Peláez, A Castelo, C N Afonso, A Borrás, J P Espinós, S Riedel, P Leiderer and J Boneberg
Click for full article
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