On-demand Milifluidic Synthesis of Quantum Dots in Digital Droplet Reactors

Craig Richard, Rachel McGee, Aditya Goenka, Prabuddha Mukherjee, Rohit Bhargava

Research output: Contribution to journalArticle

Abstract

Colloidal quantum dots (QDs) offer dramatic potential due to their size-dependent optical properties. Lack of facile synthesis methods for precise and reproducible size and composition, however, presents an extant barrier to their widespread use. Here, we report the use of droplet microfluidics for the simple and highly reproducible synthesis of cadmium sulfide (CdS) and cadmium selenide (CdSe) QDs without the use of harsh solvents and in ambient conditions. Our approach uses a liquid-liquid barrier between two immiscible liquids to generate a digital droplet reactor. This reaction droplet is easily controlled and manipulated and offers enhanced mixing when coupled to a helical mixer, resulting in a significant reduction in size distribution compared to benchtop procedures. Furthermore, QD characteristics have been modeled and predicted based on the parameters of the microfluidic device. We believe this method overcomes the current manufacturing challenges with synthesizing nanostructures, which is required for the next generation of nanosensors.

Original languageEnglish (US)
Pages (from-to)3730-3735
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume59
Issue number9
DOIs
StatePublished - Mar 4 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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