Preparation of a ZnS Shell on CdSe Quantum Dots Using a Single-Molecular Precursor

Johannes Rytter Dethlefsen; Anders Rørbæk Døssing

Preparation of a ZnS Shell on CdSe Quantum Dots Using a Single-Molecular Precursor

Johannes Rytter Dethlefsen, Anders Rørbæk Døssing

Department of Chemistry

70 Citations (Scopus)

Abstract

A simple synthetic route to the preparation of a thin ZnS shell on CdSe quantum dot cores from the air-stable, single-molecular precursor zinc diethyldithiocarbamate, Zn(S₂CNEt₂)₂, in the three-component solvent system octadec-1-ene/oleylamine/tri-n-octylphosphine (ODE/OLA/TOP) is presented. The one-pot synthesis proceeds through heating of the solution of CdSe cores and the amount of crystalline Zn(S ₂CNEt₂)₂ corresponding to a shell thickness of two monolayers of ZnS to 110-120 °C for 1-2 h. The role of the surfactants OLA and TOP and the significance of the temperature and the amount of Zn(S ₂CNEt₂)₂ have been investigated with optical absorption and luminescence spectroscopy. We show that the presence of both OLA and TOP is crucial for the low-temperature growth and that the amount of precursor corresponding to two monolayers of ZnS results in the highest quality of core/shell CdSe/ZnS quantum dots.

Original language	English
Journal	Nano Letters
Volume	11
Pages (from-to)	1964-1969
ISSN	1530-6984
Publication status	Published - 11 May 2011

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title = "Preparation of a ZnS Shell on CdSe Quantum Dots Using a Single-Molecular Precursor",

abstract = "A simple synthetic route to the preparation of a thin ZnS shell on CdSe quantum dot cores from the air-stable, single-molecular precursor zinc diethyldithiocarbamate, Zn(S2CNEt2)2, in the three-component solvent system octadec-1-ene/oleylamine/tri-n-octylphosphine (ODE/OLA/TOP) is presented. The one-pot synthesis proceeds through heating of the solution of CdSe cores and the amount of crystalline Zn(S 2CNEt2)2 corresponding to a shell thickness of two monolayers of ZnS to 110-120 °C for 1-2 h. The role of the surfactants OLA and TOP and the significance of the temperature and the amount of Zn(S 2CNEt2)2 have been investigated with optical absorption and luminescence spectroscopy. We show that the presence of both OLA and TOP is crucial for the low-temperature growth and that the amount of precursor corresponding to two monolayers of ZnS results in the highest quality of core/shell CdSe/ZnS quantum dots.",

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pages = "1964--1969",

journal = "Nano Letters",

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T1 - Preparation of a ZnS Shell on CdSe Quantum Dots Using a Single-Molecular Precursor

AU - Dethlefsen, Johannes Rytter

AU - Døssing, Anders Rørbæk

PY - 2011/5/11

Y1 - 2011/5/11

N2 - A simple synthetic route to the preparation of a thin ZnS shell on CdSe quantum dot cores from the air-stable, single-molecular precursor zinc diethyldithiocarbamate, Zn(S2CNEt2)2, in the three-component solvent system octadec-1-ene/oleylamine/tri-n-octylphosphine (ODE/OLA/TOP) is presented. The one-pot synthesis proceeds through heating of the solution of CdSe cores and the amount of crystalline Zn(S 2CNEt2)2 corresponding to a shell thickness of two monolayers of ZnS to 110-120 °C for 1-2 h. The role of the surfactants OLA and TOP and the significance of the temperature and the amount of Zn(S 2CNEt2)2 have been investigated with optical absorption and luminescence spectroscopy. We show that the presence of both OLA and TOP is crucial for the low-temperature growth and that the amount of precursor corresponding to two monolayers of ZnS results in the highest quality of core/shell CdSe/ZnS quantum dots.

AB - A simple synthetic route to the preparation of a thin ZnS shell on CdSe quantum dot cores from the air-stable, single-molecular precursor zinc diethyldithiocarbamate, Zn(S2CNEt2)2, in the three-component solvent system octadec-1-ene/oleylamine/tri-n-octylphosphine (ODE/OLA/TOP) is presented. The one-pot synthesis proceeds through heating of the solution of CdSe cores and the amount of crystalline Zn(S 2CNEt2)2 corresponding to a shell thickness of two monolayers of ZnS to 110-120 °C for 1-2 h. The role of the surfactants OLA and TOP and the significance of the temperature and the amount of Zn(S 2CNEt2)2 have been investigated with optical absorption and luminescence spectroscopy. We show that the presence of both OLA and TOP is crucial for the low-temperature growth and that the amount of precursor corresponding to two monolayers of ZnS results in the highest quality of core/shell CdSe/ZnS quantum dots.

M3 - Journal article

SN - 1530-6984

VL - 11

SP - 1964

EP - 1969

JO - Nano Letters

JF - Nano Letters

ER -

Preparation of a ZnS Shell on CdSe Quantum Dots Using a Single-Molecular Precursor

Abstract

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