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Stable CsPbBr3 Nanoclusters Feature a Disk-like Shape and a Distorted Orthorhombic Structure.
Baowei Zhang1,2, Davide Altamura3, Rocco Caliandro3
1Nanochemistry Department, Istituto Italiano di Tecnologia (IIT), via Morego 30, 16163 Genova, Italy.
Stabilized cesium lead bromide (CsPbBr3) nanoclusters were synthesized using benzoic acid and oleylamine ligands. These stable nanoclusters exhibit unique disk-like shapes and 2D hexagonal packing, paving the way for novel perovskite nanostructures.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Chemistry
Background:
- Cesium lead bromide (CsPbBr3) nanoclusters are typically unstable and used as precursors.
- Detailed characterization of these nanoclusters is limited due to their instability.
Purpose of the Study:
- To stabilize CsPbBr3 nanoclusters using specific ligands.
- To perform a detailed characterization of the stabilized nanoclusters.
Main Methods:
- Ligand passivation using benzoic acid and oleylamine.
- Synchrotron X-ray pair distribution function (PDF) measurements.
- Small- and wide-angle X-ray scattering (SAXS/WAXS) analyses.
Main Results:
- Stabilized CsPbBr3 nanoclusters with a composition of CsPbBr2.3.
- Disk-like morphology (thickness < 2 nm, diameter 13 nm) with distorted orthorhombic CsPbBr3 structure.
- Formation of 2D hexagonal packing with short-range order and lamellar packing with long-range order.
Conclusions:
- Successful stabilization of CsPbBr3 nanoclusters achieved through ligand engineering.
- Comprehensive structural and morphological characterization revealed unique properties.
- The findings enable potential applications in advanced perovskite-based materials.
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