Imaging Supported Metal Nanoparticles in

F re 3.8 (a) A schematic diagram of the probe/sample/detector arrangement 

F re 3.9 (a) BF-TEM diffraction contrast images, (b) HREM phase contrast 

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

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). 

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 

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