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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Light-Triggered Reversible Assembly of Halide Perovskite Nanoplatelets.

Vishwadeepa Hazra1, Sougata Saha2, Swapan K Pati2

  • 1Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India.

Advanced Materials (Deerfield Beach, Fla.)
|December 26, 2024
PubMed
Summary

Photo-switchable semiconductor nanostructures, cesium bismuth iodide nanoplatelets, reversibly assemble under light. This enables tunable color and enhanced electronic conductivity for nanoactuators and sensors.

Keywords:
halide perovskitesnanoplateletsperpetual flippingphotomechanical responsesreversible assemblytopographical oscillations

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Stimuli-driven nanoactuators require photo-switchable semiconductor nanostructures.
  • Precise mechanical responses are crucial for advanced nanotechnology applications.

Purpose of the Study:

  • To demonstrate reversible assembly of cesium bismuth iodide nanoplatelets (NPLs) triggered by light.
  • To investigate the photomechanical response and its impact on electronic and optical properties.

Main Methods:

  • Utilized 0D Cs3Bi2I9 halide perovskite nanoplatelets (NPLs).
  • Investigated light-induced reversible assembly between stacked and scattered configurations.
  • Analyzed changes in color, electronic conductivity, and optical absorbance.

Main Results:

  • NPLs reversibly switch between stacked (brown) and scattered (red) states in under a minute.
  • Stacked NPLs form moiré superstructures, enhancing conductivity by 3.5-fold and reducing exciton binding energy.
  • Photomechanical response driven by reversible sulfide linkage formation/cleavage.

Conclusions:

  • Demonstrated self-flipping NPL nanoactuators with reversible mechanical responses (14-50 nm oscillations).
  • Achieved switchable control over color and electric current with minor memory effects.
  • Highlighted potential for nanorobotics, nanoscale switches, and sensors.