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Millisecond Kinetics of PbS Quantum Dots Using Droplet-based Microfluidics with On-line Absorption and Fluorescence Spectroscopy

Published online by Cambridge University Press:  10 June 2015

Ioannis Lignos ,
Stavros Stavrakis ,
Ardita Kilaj  and
Andrew deMello
Ioannis Lignos
Affiliation:
Institute for Chemical & Bioengineering, Department of Chemistry & Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093
Stavros Stavrakis
Affiliation:
Institute for Chemical & Bioengineering, Department of Chemistry & Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093
Ardita Kilaj
Affiliation:
Institute for Chemical & Bioengineering, Department of Chemistry & Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093
Andrew deMello
Affiliation:
Institute for Chemical & Bioengineering, Department of Chemistry & Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093
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Abstract

We report a novel approach for the on-line characterization of nucleation and growth kinetics of lead sulfide (PbS) quantum dots using droplet-based microfluidics. Monodisperse NIR-emitting PbS with optical bandgap between 680 to 1200 nm can be formed rapidly using two reaction schemes at different operating temperatures between 70 and 130°C and the temporal evolution of the absorption and fluorescence spectra are monitored in real-time using a microfluidic platform with an on-line absorption and fluorescence optical system. Therefore, this microfluidic platform is able to provide quantitative information on a millisecond (ms) time frame regarding the size, size distribution, concentration and emission characteristics of the generated nuclei and particles. To our knowledge, this represents the first microfluidic approach for the study of the nucleation and growth in high-temperature colloidal crystallization using in-situ absorption and photoluminescence spectroscopy.

Keywords

kineticsnucleation & growthnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1780: Symposium N – From Molecules to Colloidal Compound Semiconductor Nanocrystals―Advances in Mechanism-Enabled Design and Syntheses , 2015 , mrss15-2131560
Copyright
Copyright © Materials Research Society 2015 

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References

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