Organic ligands play a crucial role in the properties and functionality of nanostructures. Functional ligands are an interesting research direction that can be utilized to influence the properties and functionality of nanoparticles (NPs). In this work, we demonstrate controlled assembly of CsPbBr3 perovskite NPs as a result of light. Azobenzene derivative molecules were used as the photoswitchable ligands for the NPs. The assembly and disassembly of the NPs were achieved by cis-trans isomerization. By utilizing polarization-modulated, infrared reflection-absorption spectroscopy and diffusion-ordered nuclear magnetic resonance, we were able to track the attachment of the ligands to the surface of the NPs. Absorbance, photoluminescence and high-resolution, transmission electron microscopy followed the assembly and disassembly of the NPs. This work demonstrates functional ligands paired to perovskite nanostructures through controlling their assembly and disassembly, which opens the way for sensing and photodetection applications.
Bibliographical noteFunding Information:
We would like to thank the Israel Science foundation and the Air Force Research Laboratory (AFRL) for their financial support. We would like to thank Iris Berg from Professor Elad Gross’ research group for performing the PM-IRRAS measurements.
© 2023 The Author(s). Published by IOP Publishing Ltd.