Effect of Silver Ion‐Exchange on the Precipitation of Lead Sulfide Quantum Dots in Glasses
This article reports the effect of
+ ion‐exchange on the precipitation of Ag quantum dots ( PbS QDs) in silicate glasses. The glasses were subjected to ion‐exchange
in 3 salt melts at 260°C for 60 s. AgNO nanoparticles ( Ag NPs) and precipitated after heat treatment at temperatures
of 440°C–460°C for 10 h. Photoluminescence wavelength λPL of PbS QDs was longer (~1525 ≤ λPL ≤ ~1580 nm) in PbS QDs +
ion‐exchanged regions than in Ag +‐free regions (~1030 ≤ λPL ≤ ~1200 nm). Average diameter D of Ag estimated by calculation
and PbS QDs TEM images was larger in + ion‐exchanged regions (~5.2 ≤ D ≤ ~5.5 nm) than in Ag +‐free regions (~2.4 ≤ D ≤ ~3.3 nm).
Ag that formed during heat treatment provided the sites for heterogeneous nucleation of Ag NPs and promoted the precipitation of PbS QDs in glasses.
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Document Type: Research Article
Publication date: September 1, 2012