Fig. 3. (a) HAADF-STEM image of Pd–In–Cu/Al₂O₃ (Pd : In : Cu = 3 : 1 : 2) and (b) size distribution of the nanoparticle. (c) High-resolution STEM image of a single nanoparticle (top) and rhombohedral crystal of PdIn viewed along the [111] direction (bottom). (d) HAADF-STEM image of Pd–In–Cu/Al₂O₃ and elemental maps of (e) the Pd + In + Cu overlayer, (f) Pd, (g) In, and (h) Cu acquired using EDX.