In Situ Intrinsic Self-Healing of Low Toxic Cs ZnX (X = Cl, Br) Metal Halide Nanoparticles.

This study reports on the intrinsic and fast self-healing ability of all inorganic, low-toxic Cs ZnX (X = Cl, Br) metal halide nanoparticles (NPs) when subjected to local heating by electron beam irradiation in high-resolution transmission electron microscopy (HR-TEM). The local heating induces the creation of nanoshells (NSs) following the template of the corresponding NPs, which are subsequently healed back to their original state within several minutes. Energy dispersive spectroscopy (EDS) and fast Fourier transform (FFT) analysis reveal that the composition, phase, and crystallographic structure of the original NPs are restored during the self-healing process, with a thin crystalline layer observed at the bottom of the NSs acting as the healing template.