HAADF-STEM image

Figure 9.13 (a) SEM BSE image and (b) STEM HAADF image of Pd nanoparticles on a carbon support. The clarity of the images illustrates the advantage of the HAADF and BSE approach. (Reproduced from Ref. 36). 

Typical examples of Rutherford-scattered imaging of nanoparticles of a commercially important Pd/C catalyst recorded with (a) a BSE detector in a field emission scanning electron microscope as well as (b) a STEM HAADF image of the same 5% Pd/C sample, recorded in the same instrument, are shown... 

Fig. 26. (a) STEM-HAADF image acquired from the Pd/C sample shown in Fig. 25. (b) Animation of the three-dimensional reconstruction of the object in (a) (119). 

Fig. 18.20 Representative STEM-HAADF image of the Au ion-implanted Ti02 operated at 300 K and subsequently annealed at 1,275 K, revealing large Au clusters, which are labeled by Au. The dashed line circled region is Au atoms conglomerated region [reprinted with permission from Wang et al. (2004), copyright 2004, American Institute of Physics]...

Fig. 2 STEM-HAADF image and line analysis of the M-CZ catalyst...

The Zcontrast, inherent to STEM-HAADF images, can also yield additional information on supported metal alloy particles. 

Another extremely important feature of aberration-corrected STEM-HAADF imaging of supported metal catalyst systems, is that sub-nm clusters and even atomically dispersed metal atoms become visible provided there is a reasonable Z-contrast between the metal... 

STEM-HAADF images of Au/CZ and Au/CTZ catalysts. By analysing these images, the Au nanoparticle size distributions shown in the lower part of Fig. 2.24 could be determined. ... 

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