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Issue 26, 2016
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Scalable production of CuInS2/ZnS quantum dots in a two-step droplet-based microfluidic platform

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Abstract

We report the scalable formation of CuInS2/ZnS nanocrystals using a two-stage microfluidic reactor integrated with a real-time optical detection system, which is able to monitor reaction parameters prior and subsequent to the addition of the shell material. By injecting a ZnS single source precursor in droplets containing CuInS2 cores and without the need of purification steps, we are able to obtain core–shell nanocrystal populations emitting between 580 and 760 nm with significant narrower size distributions (90–95 nm) than for the same material systems synthesized on the macroscale. In-line monitoring allowed for rapid assessment of optimum reaction parameters (Cu/In, S/(Cu + In), Zn/(Cu + In) molar ratios, temperatures and reaction time) and enabled the formation of CuInS2/ZnS nanocrystals with high photoluminescence quantum yields (∼55%) within a few seconds. We believe that this synthetic methodology will be of significant utility in controllable production of ternary and quaternary metal chalcogenides, complex core–shell and doped nanostructures.

Graphical abstract: Scalable production of CuInS2/ZnS quantum dots in a two-step droplet-based microfluidic platform

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Publication details

The article was received on 18 May 2016, accepted on 15 Jun 2016 and first published on 15 Jun 2016


Article type: Paper
DOI: 10.1039/C6TC02057G
Citation: J. Mater. Chem. C, 2016,4, 6401-6408
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    Scalable production of CuInS2/ZnS quantum dots in a two-step droplet-based microfluidic platform

    A. Yashina, I. Lignos, S. Stavrakis, J. Choo and A. J. deMello, J. Mater. Chem. C, 2016, 4, 6401
    DOI: 10.1039/C6TC02057G

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