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Investigation of the exchange kinetics and surface recovery of CdxHg1-xTe dots during cation exchange using a microfluidic flow reactor

Investigation of the exchange kinetics and surface recovery of CdxHg1-xTe dots during cation exchange using a microfluidic flow reactor
Investigation of the exchange kinetics and surface recovery of CdxHg1-xTe dots during cation exchange using a microfluidic flow reactor
Detailed analyses of coupled photoluminescence, emission lifetime, and absorption measurements have been made on the products of cation exchange reactions between CdTe nanocrystals and Hg2+ salt/ligand solutions in a microfluidic flow reactor and capillary measurement cell to probe the reaction kinetics over the seconds to hours time scale and to establish the influence of the reaction conditions on the spatial distribution of the mixed cations within the resulting CdxHg1–xTe colloidal quantum dots. The establishment of the evolution of the radiative and nonradiative rates allowed the recovery of the emission quantum yield in CdxHg1–xTe quantum dots to be quantified to almost 50% and the necessary time scales to be determined for each set of reaction conditions. The reaction kinetics showed clear indication of a fast surface exchange process followed by a slower internal rearrangement of the cation distribution.
0897-4756
2756−2768
Kershaw, Stephen V.
2ac8bd5e-cbf1-4d9a-adcb-65dedf244b9b
Abdelazim, Nema
2ac8bd5e-cbf1-4d9a-adcb-65dedf244b9b
Zhao, Yihua
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Susha, Andrei S.
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Zhovtiuk, Olga
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Teoh, Wey Yang
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Rogach, Andrey L.
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Kershaw, Stephen V.
2ac8bd5e-cbf1-4d9a-adcb-65dedf244b9b
Abdelazim, Nema
2ac8bd5e-cbf1-4d9a-adcb-65dedf244b9b
Zhao, Yihua
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Susha, Andrei S.
8eff15ee-13ed-4d70-9797-cffb1eab102f
Zhovtiuk, Olga
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Teoh, Wey Yang
c14091c7-7f0f-44ba-b288-b0e9cd20f9da
Rogach, Andrey L.
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Kershaw, Stephen V., Abdelazim, Nema, Zhao, Yihua, Susha, Andrei S., Zhovtiuk, Olga, Teoh, Wey Yang and Rogach, Andrey L. (2017) Investigation of the exchange kinetics and surface recovery of CdxHg1-xTe dots during cation exchange using a microfluidic flow reactor. Chemistry of Materials, 29, 2756−2768. (doi:10.1021/acs.chemmater.6b04544).

Record type: Article

Abstract

Detailed analyses of coupled photoluminescence, emission lifetime, and absorption measurements have been made on the products of cation exchange reactions between CdTe nanocrystals and Hg2+ salt/ligand solutions in a microfluidic flow reactor and capillary measurement cell to probe the reaction kinetics over the seconds to hours time scale and to establish the influence of the reaction conditions on the spatial distribution of the mixed cations within the resulting CdxHg1–xTe colloidal quantum dots. The establishment of the evolution of the radiative and nonradiative rates allowed the recovery of the emission quantum yield in CdxHg1–xTe quantum dots to be quantified to almost 50% and the necessary time scales to be determined for each set of reaction conditions. The reaction kinetics showed clear indication of a fast surface exchange process followed by a slower internal rearrangement of the cation distribution.

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Published date: 3 March 2017

Identifiers

Local EPrints ID: 451981
URI: http://eprints.soton.ac.uk/id/eprint/451981
ISSN: 0897-4756
PURE UUID: 5376f854-3f77-4a60-b953-bcb5cb875442

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Date deposited: 05 Nov 2021 17:31
Last modified: 16 Mar 2024 14:22

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Contributors

Author: Stephen V. Kershaw
Author: Nema Abdelazim
Author: Yihua Zhao
Author: Andrei S. Susha
Author: Olga Zhovtiuk
Author: Wey Yang Teoh
Author: Andrey L. Rogach

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