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Role of Nd 3+ ions on the nucleation and growth of PbS quantum dots ( QD s) in silicate glasses
Author(s) -
Park Won Ji,
Kim Min Gyu,
Kim Ju Eun,
Wang Jing,
Lee Ho Jeong,
Park Chan Gyung,
Heo Jong
Publication year - 2017
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/jace.14825
Subject(s) - chalcogenide , ion , nucleation , quantum dot , materials science , absorption (acoustics) , extended x ray absorption fine structure , analytical chemistry (journal) , diffusion , absorption spectroscopy , precipitation , silicate , crystallography , chemistry , nanotechnology , physics , optics , optoelectronics , organic chemistry , chromatography , meteorology , composite material , thermodynamics
The influence of Nd 2 O 3 addition on the precipitation kinetics of lead chalcogenide (PbS) quantum dots ( QD s) in silicate glasses was investigated. Energy dispersive X‐ray spectroscopy ( EDS ) indicated that the Nd 3+ ions are preferentially located inside the PbS QD s rather than in the glass matrix. Changes in diameter ( D ) of PbS QD s exhibited smaller time dependencies (i.e., D ≈ t 0.270‐0.286 ) than that predicted by the classical Lifshitz–Slyozov–Wagner ( LSW ) theory. This is due to the limited concentrations of Pb 2+ and S 2− ions and the large diffusion distance inside the glass matrix. In addition, extended X‐ray absorption fine structure ( EXAFS ) results indicated that the formation of PbS QD s was retarded due to the presence of Nd 2 O 3 in the glasses, as the large NdO x polyhedra interrupt the diffusion of Pb 2+ and S 2− ions. We believe that these Nd 3+ ions are primarily located in PbS QD s in the form of Nd–O clusters, and that the PbS QD s are built on top of these clusters.