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Long-armed hexapod nanocrystals of cesium lead bromide.
Journal article

Long-armed hexapod nanocrystals of cesium lead bromide.

  • Li S Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland. andrew.demello@chem.ethz.ch philip.howes@chem.ethz.ch.
  • Probst J Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland. andrew.demello@chem.ethz.ch philip.howes@chem.ethz.ch.
  • Howes PD Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland. andrew.demello@chem.ethz.ch philip.howes@chem.ethz.ch.
  • deMello AJ Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland. andrew.demello@chem.ethz.ch philip.howes@chem.ethz.ch.
  • 2020-07-08
Published in:
  • Nanoscale. - 2020
General Materials Science
English Colloidal lead halide perovskite nanocrystals (LHP NCs) assume a variety of morphologies (e.g. cubes, sheets, and wires). Their labile structural and surface characters allow them to undergo post-synthetic evolution of shape and crystallographic characters. Such transformations can be advantageous or deleterious, and it is therefore vital to both understand and exert control over these processes. In this study, we report novel long-armed hexapod structures of cesium lead bromide nanocrystals. These branched structures evolve from quantum-confined CsPbBr3 nanosheets to Cs4PbBr6 hexapods over a period of 24 hours. Time-resolved optical and structural characterization reveals a post-synthesis mechanism of phase transformation, oriented attachment and branch elongation. More generally, the study reveals important processes associated with LHP NC aging and demonstrates the utility of slow reaction kinetics in obtaining complex morphologies.
Language
  • English
Open access status
hybrid
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https://sonar.ch/global/documents/185489
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