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(a) Low magnification and (b) Amplified HAADF-STEM images of AgPd/Pt core-shell multiply twinned particles with icosahedral morphologies. High magnification of HAADF images (c) Icosahedral structure along 5-fold symmetry axis inset shows the atomistic model of the 5-fold symmetry axis and (d) Hollow structure nanoparticle, where we observed the Ag atoms are segregated from the structure.
