Merck

Near-Room Temperature Synthesis of Core/Shell-Structured Quantum Dots.

Journal of nanoscience and nanotechnology (2015-12-31)
Junhyeong Kim, Eunjung Kang, Jaesung Son, In Woo Cheong, Jin Joo
ABSTRACT

Core/shell-structured quantum dots (QDs) are considered as important active materials for optoelectronic devices. There have been a lot of synthesis procedures developed so far. Real epitaxial growth of shell layer, however, has not been reported yet. Here, a simple method for the synthesis of CdSe/CdS core/shell QDs is presented. Epitaxial growth of CdS shell on CdSe core is carried out by near room temperature successive ion layer adsorption and reaction (RT-SILAR). Our method for shell formation is conducted at room temperature, which facilitates the separation of resulting products from shell growth solution. After full coverage with one monolayer (ML) of CdS on CdSe QDs surface, photoluminescence (PL) quantum yield (QY) reaches up to 60%. Produced CdSe/CdS QDs have an elongated morphology, implying that CdS layers are formed in an epitaxial manner without etching or deteriorating CdSe QDs surface. We believe that our synthesis method for core/shell-structured QDs would be an ideal model for practical implication of QDs as well as fundamental studies.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
油胺, technical grade, 70%
Sigma-Aldrich
硒, powder, −100 mesh, 99.99% trace metals basis
Sigma-Aldrich
羟胺 溶液, 50 wt. % in H2O
Sigma-Aldrich
三正辛基膦, 97%
Sigma-Aldrich
硒, powder, −100 mesh, ≥99.5% trace metals basis
Sigma-Aldrich
氯化镉, 99.99% trace metals basis
Sigma-Aldrich
三正辛基膦, technical grade, 90%
SAFC
油胺, ≥98% (primary amine)
Sigma-Aldrich
十六胺, 98%
Sigma-Aldrich
羟胺 溶液, 50 wt. % in H2O, 99.999%
Sigma-Aldrich
氯化镉, technical grade
Sigma-Aldrich
四癸基膦酸, 98%
Sigma-Aldrich
硒, pellets, <5 mm particle size, ≥99.999% trace metals basis
Sigma-Aldrich
醋酸镉, anhydrous, 99.995%
Sigma-Aldrich
硒, pellets, <5 mm, ≥99.99% trace metals basis
Sigma-Aldrich
十六胺, technical grade, 90%
硒, foil, 25x25mm, thickness 3mm, 99.95%
硒, pellets, < 5mm, ≥99.999%
醋酸镉(II), SAFC Hitech®, anhydrous, 99.995%