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Effect of Silver Ion‐Exchange on the Precipitation of Lead Sulfide Quantum Dots in Glasses
Author(s) -
Xu Kai,
Heo Jong
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05313.x
Subject(s) - precipitation , nucleation , quantum dot , lead sulfide , photoluminescence , ion , materials science , ion exchange , nanoparticle , sulfide , silicate glass , analytical chemistry (journal) , chemical engineering , mineralogy , inorganic chemistry , nanotechnology , chemistry , metallurgy , optoelectronics , chromatography , composite material , physics , organic chemistry , meteorology , engineering
This article reports the effect of Ag + ion‐exchange on the precipitation of PbS quantum dots ( QDs ) in silicate glasses. The glasses were subjected to ion‐exchange in AgNO 3 salt melts at 260°C for 60 s. Ag nanoparticles ( NPs ) and PbS QDs precipitated after heat treatment at temperatures of 440°C–460°C for 10 h. Photoluminescence wavelength λ PL of PbS QDs was longer (~1525 ≤ λ PL ≤ ~1580 nm) in Ag + ion‐exchanged regions than in Ag + ‐free regions (~1030 ≤ λ PL ≤ ~1200 nm). Average diameter D of PbS QDs estimated by calculation and TEM images was larger in Ag + ion‐exchanged regions (~5.2 ≤ D ≤ ~5.5 nm) than in Ag + ‐free regions (~2.4 ≤ D ≤ ~3.3 nm). Ag NPs that formed during heat treatment provided the sites for heterogeneous nucleation of PbS QDs and promoted the precipitation of PbS QDs in glasses.