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Title

Enhanced reactivity and related optical changes of Ag nanoparticles on amorphous Al2O3 supports

AuthorsPeláez, Ramón J. ; Castelo, A; Afonso, Carmen N. ; Borrás, Ana ; Espinós, J.P. ; Riedel, S.; Leiderer, P.; Boneberg, J.
Issue Date2013
PublisherInstitute of Physics Publishing
CitationNanotechnology 24: 365702 (2013)
AbstractPairs 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 2O3) 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-Al2O3 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 2O3 samples and sulfurization is negligible. Both optical and chemical results are consistent with the production of a shell at the expense of a reduction of the metal core dimensions, the latter being responsible for the blue-shift and related to the small (<10 nm initial diameter) of the NPs. The enhanced reactivity of the Ag NPs on the a-Al 2O3 supports goes along with specific morphological changes of the Ag NPs and the observation of nitrogen. © 2013 IOP Publishing Ltd.
URIhttp://hdl.handle.net/10261/87540
DOI10.1088/0957-4484/24/36/365702
Identifiersdoi: 10.1088/0957-4484/24/36/365702
issn: 0957-4484
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