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Investigation of the Exchange Kinetics and Surface Recovery of CdxHg1-xTe Quantum Dots during Cation Exchange Using a Microfluidic Flow Reactor

Kershaw, Stephen V. and Abdelazim, Nema Mohamed Safwat Ibrahim and Zhao, Yihua and Susha, Andrei S. and Zhovtiuk, Olga and Teoh, Wey Yang and Rogach, Andrey L. (2017) Investigation of the Exchange Kinetics and Surface Recovery of CdxHg1-xTe Quantum Dots during Cation Exchange Using a Microfluidic Flow Reactor. Chemistry of Materials, 29 (7). pp. 2756-2768. ISSN 0897-4756

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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.

Item Type: Journal Article
Journal or Publication Title: Chemistry of Materials
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 89562
Deposited By: ep_importer_pure
Deposited On: 31 Jan 2018 16:08
Refereed?: No
Published?: Published
Last Modified: 17 Jul 2018 06:20
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/89562

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