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Halide perovskites as disposable epitaxial templates for the phase-selective synthesis of lead sulfochloride nanocrystals
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Halide perovskites as disposable epitaxial templates for the phase-selective synthesis of lead sulfochloride nanocrystals
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Journal Article
Halide perovskites as disposable epitaxial templates for the phase-selective synthesis of lead sulfochloride nanocrystals
2022
Overview
Colloidal chemistry grants access to a wealth of materials through simple and mild reactions. However, even few elements can combine in a variety of stoichiometries and structures, potentially resulting in impurities or even wrong products. Similar issues have been long addressed in organic chemistry by using reaction-directing groups, that are added to a substrate to promote a specific product and are later removed. Inspired by such approach, we demonstrate the use of CsPbCl
3
perovskite nanocrystals to drive the phase-selective synthesis of two yet unexplored lead sulfochlorides: Pb
3
S
2
Cl
2
and Pb
4
S
3
Cl
2
. When homogeneously nucleated in solution, lead sulfochlorides form Pb
3
S
2
Cl
2
nanocrystals. Conversely, the presence of CsPbCl
3
triggers the formation of Pb
4
S
3
Cl
2
/CsPbCl
3
epitaxial heterostructures. The phase selectivity is guaranteed by the continuity of the cationic subnetwork across the interface, a condition not met in a hypothetical Pb
3
S
2
Cl
2
/CsPbCl
3
heterostructure. The perovskite domain is then etched, delivering phase-pure Pb
4
S
3
Cl
2
nanocrystals that could not be synthesized directly.
Phase-selective approaches, such using reaction-directing groups, are often seen in traditional organic chemistry and catalysis. Here authors use perovskite nanocrystals as disposable templates to drive the phase-selective synthesis of two colloidal nanomaterials, the lead sulfohalides Pb
3
S
2
Cl
2
and Pb
4
S
3
Cl
2
.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
