Automated microfluidic screening of ligand interactions during the synthesis of cesium lead bromide nanocrystals
| Autor: | Andrew J. deMello, Ioannis Lignos, Zhibo Yang, Stavros Stavrakis, Shangkun Li, Philip D. Howes, Robert W. Baker |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Photoluminescence Materials science Ligand Process Chemistry and Technology Biomedical Engineering Nanowire Energy Engineering and Power Technology Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry Nanocrystal Chemistry (miscellaneous) Materials Chemistry Chemical Engineering (miscellaneous) Physical chemistry 0210 nano-technology Luminescence Alkyl Perovskite (structure) |
| Zdroj: | Molecular Systems Design & Engineering, 5 (6) |
| ISSN: | 2058-9689 |
| Popis: | Varying the nature of the molecular surface ligands used to synthesize and stabilize lead halide perovskite nanocrystals provides a facile way of tuning and optimizing particle properties. However, the inherently complex reaction parameter space associated with perovskite nanocrystal synthesis complicates this, necessitating long-term and laborious experimentation to optimize conditions for a specific ligand set, and to compare nanoparticle properties across different ligand sets. In the current work, we present an automated microfluidic-based strategy for multidimensional parameter screening, seeking to maximize luminescence intensities and minimize emission bandwidths from quantum confined nanostructures, by monitoring variations in photoluminescence as a function of reaction temperature, base-to-acid ligand ratio, and ligand alkyl chain structure (linear versus branched). For a linear ligand pair (octylamine and octanoic acid), we find two reaction parameter sets that yield bright and narrow emission from nanosheets emitting at 460 nm (synthesized at 100 °C with a low base : acid ratio, FWHM = 25 nm) and nanowires emitting at 497 nm (synthesized at 140 °C with a high base : acid ratio, FWHM = 17 nm). Introducing branched ligands (2-ethylhexylamine and/or 2-ethylhexanoic acid) induces a red shift in emission and shows that bright and narrow emission can only be obtained from weakly quantum-confined nanostructures, within the reaction conditions studied. This work represents the first use of a rapid automated microfluidic system for the screening of ligand interactions during the synthesis lead halide perovskite nanocrystals. Molecular Systems Design & Engineering, 5 (6) ISSN:2058-9689 |
| Databáze: | OpenAIRE |
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