Increasing Exfoliation Yield in the Synthesis of MoS2 Quantum Dots for Optoelectronic and Other Applications through a Continuous Multicycle Acoustomicrofluidic Approach

Marqus, S, Ahmed, H, Ahmed, M, Xu, C, Rezk, A and Yeo, L 2018, 'Increasing Exfoliation Yield in the Synthesis of MoS2 Quantum Dots for Optoelectronic and Other Applications through a Continuous Multicycle Acoustomicrofluidic Approach', ACS applied nanomaterials, vol. 1, no. 6, pp. 2503-2508.


Document type: Journal Article
Collection: Journal Articles

Title Increasing Exfoliation Yield in the Synthesis of MoS2 Quantum Dots for Optoelectronic and Other Applications through a Continuous Multicycle Acoustomicrofluidic Approach
Author(s) Marqus, S
Ahmed, H
Ahmed, M
Xu, C
Rezk, A
Yeo, L
Year 2018
Journal name ACS applied nanomaterials
Volume number 1
Issue number 6
Start page 2503
End page 2508
Total pages 6
Publisher American Chemical Society
Abstract We show that the synthesis yields of transition-metal dichalcogenide (TMD) quantum dots (QDs)-in particular, that of molybdenum disulfide (MoS2)-can be improved through a miniaturized continuous multicycle microfluidic process. The process exploits the unique piezoelectricity of two-dimensional (2D) TMDs by employing the strong electromechanical coupling inherent in a novel acoustomicrofluidic nebulization process to delaminate and laterally cleave the bulk TMD material into QDs. In particular, we show that by carrying out the process in a closed system the nebulized aerosols containing the exfoliated QDs recondense and are repeatedly renebulized. With each successive nebulization-condensation-renebulization cycle, the QDs are progressively thinned and become increasingly uniform in their lateral dimension. Over just four 10 min cycles, the yield of predominantly single-layer QDs with a mean lateral dimension of 8.25 ± 4 nm is 10.7 ± 2% with a single chipscale device, which is considerably higher than the typical 2-3% yields obtained with conventional synthesis methods. Given the simplicity, low cost, and miniaturizability of the technology, the process can be easily parallelized for high production throughput commensurate with industrial-scale synthesis for a wide range of applications across optoelectronics, photocatalysis, energy storage, photonics, and biosensing, among others.
Subject Synthesis of Materials
Nanomaterials
Keyword(s) Transition-metal dichalcogenides
Acoustic wave
Microfluidics
Quantum dots
Exfoliation
Piezoelectricity
DOI - identifier 10.1021/acsanm.8b00559
Copyright notice © 2018 American Chemical Society
ISSN 2574-0970
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