Optical Characterization of Ag Nanoparticles Embedded
in Aluminophosphate Glass |
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Authors: | JA Jiménez S Lysenko G Zhang H Liu |
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Affiliation: | (1) Department of Chemistry, University of Puerto Rico, Mayagüez, PR 00681-9019, USA;(2) Department of Physics, University of Puerto Rico, Mayagüez, PR 00681-9016, USA |
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Abstract: | An aluminophosphate glass system containing silver and tin was prepared by the melt-quenching technique in which spherical
silver nanoparticles (NPs) of different sizes were embedded upon heat treatment. Optical absorption was used in the assessment
of particle growth and for particle size estimation yielding mean radii in the 10–40 nm range. Measurements in the UV region
revealed absorption features indicative of the occurrence of silver ions and twofold-coordinated tin centers. Photoluminescence
spectroscopy excited at 355 nm showed a broadband emission around 420 nm for the non-heat-treated glass, which shows a thermal
quenching effect in temperature dependence measurements. Heat-treated glass shows a dip in the emission spectrum ascribed
to absorption by NPs. The luminescence is attributed to single Ag+ ions. The nature of the silver emitting states is discussed. |
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Keywords: | Aluminophosphate glass silver nanoparticles (NPs) surface plasmon resonance silver ions photoluminescence (PL) tin |
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