AuPd, HAADF-STEM

In Figure 3.13, the AuPd nanoparticles supported on carbon in the HAADF-STEM image enable a brighter core to be distinguished from the darker shell. It can tell us that the AuPd nanoparticles are composed of a shell and a core. Due to the mechanism of HAAD-STEM, we can clearly tell that the shell containing a lighter element (Pd) and the core containing a heavier element Au. °... 

Figure 3.13 Representative HAADF-STEM image (top left panel) of the AuPd(1 0.61)/C and its corresponding Pd (red) and Au (green) elemental mapping image. (For interpretation of the references to color in this figure legend, the reader is referred to the online version of this book.)...

Figure 23.10 (a) Time evoiution of aiioy metai nanoparticie formation, (b) SEM image of monoiith after reduction, (c) HAADF-STEM image of AuPd nanoparticie-embedded monoiith. (d-f) EDX mapping of the same. 

F re 3.10 Aberration-corrected STEM-HAADF Z-contrast images of (a) an AuPd core shell nanoparticle, and (b) an FePt ordered alloy particle. (Micrograph A courtesy of R. Tiruvalam, Lehigh University, USA. Micrograph B courtesy of J. Wittig, Vanderbilt University, Tennessee, USA). 

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