In-situ Intrinsic self-healing of low toxic Cs2ZnX4 (X= Cl, Br) metal halide nanoparticles
Ben Aizenshtein a, Lioz Etgar b
a Institute of Chemistry, The Center for Nanoscience and Nanotechnology, Casali Center for Applied Chemistry, The Hebrew University of Jerusalem, 91904, Israel
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#NCFun23 - Fundamental Processes in Nanocrystals and 2D Materials
València, Spain, 2023 March 6th - 10th
Organizers: Valerio Pinchetti and Shalini Singh
Poster, Ben Aizenshtein, 364
Publication date: 22nd December 2022

This work presents fully inorganic low-toxic Cs2ZnX4 (X= Cl, Br) nano particles (NPs), which demonstrate an intrinsic ability of fast dynamic self-healing using electron beam irradiation of high-resolution transmission electron microscopy for in-situ damage creation and observation. we enable to create temporary nanoshells preserving the different as-synthesized morphologies that was prepared at different synthesis conditions. An observation of extensive healing of the temporary nanoshells back to the as-synthesized NPs was possible due to the self-healing ability. Energy dispersive spectroscopy (EDS) and fast Fourier transform reveal the same composition, phase and structure during the various stages of the healing processes, indicating the restoration of the original as-synthesized NPs. By high resolution lattice images and by applying EDS line scan we enable to observe that the damaged inner part of the NPs and nanoshells still contain a thin surrounding crystalline layer which could function as a template for the self-healing processes. The self-healing phenomenon can be explained as fast atomic displacement and placement which is a possible result of the heat generated by inelastic scattering of the e-beam energy. those nanoparticles in addition to being environmental friendly show excellent stability in structure and optical properties over a month of measurements under ambient conditions, with photo luminescence quantum yield values ​​in the range of 9.4-12.5%. The direct applications of these NPs can be used for self-healing scintillators, and by their semiconductor nature as a platform for a variety of optoelectronic applications that require healing and stability over time at the atomic scale.

We would like to thank the Israel Science foundation and the Israel ministry of energy for the financial support during this project. A special thanks also goes to Dr. Sergey Remennik for his continued support and scientific advice in the field of HR-TEM and STEM microscopy.

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