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Two‐Phase Approach to High‐Quality, Oil‐Soluble, Near‐Infrared‐Emitting PbS Quantum Dots by Using Various Water‐Soluble Anion Precursors
Author(s) -
Deng Dawei,
Cao Jie,
Xia Junfei,
Qian Zhiyu,
Gu Yueqing,
Gu Zhongze,
Akers Walter John
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100012
Subject(s) - chemistry , selected area diffraction , lead sulfide , quantum dot , transmission electron microscopy , aqueous solution , reactivity (psychology) , sulfur , thiourea , inorganic chemistry , nanotechnology , organic chemistry , medicine , materials science , alternative medicine , pathology
Abstract Colloidal PbS quantum dots (QDs) with tunable photoemission throughout the near‐infrared (NIR) region (ca. 750–1000 nm) were synthesized by a two‐phase approach. Here, oil‐soluble lead oleate formed by a reaction of lead acetate and oleic acid (OA, the capping agent) in n ‐decane at 130 °C was used as lead precursor, and water‐soluble Na 2 S, thioacetamide (TAA), and thiourea, each having a different reactivity, were used as sulfur sources. When an n ‐decane solution of lead precursor and an aqueous solution of sulfur precursor were mixed at the appointed temperature, oil‐soluble, near‐infrared‐emitting PbS QDs were achieved. In this study, we investigated the influence of the reactivity of water‐soluble sulfur sources on the synthesis of PbS QDs. The morphology and crystal structure of the as‐prepared PbS QDs were characterized by (high‐resolution) transmission electron microscopy (TEM), selected area electron diffraction (SAED), and X‐ray diffraction (XRD).