Figure 4

Sequence of SE images recorded at 300 kV in the Hitachi HF-3000. With the same support particle held at 700°C, several Au nanoparticles are visible on the surface; (A) initial image at the start of sequence taken at room temperature; (B-F) SE images from 30 to 200 s at 700°C show development of facets on the support surface and movement and coalescence of nanoparticles, as arrowed; and (G) a movie clip constructed from the images (A) through (F).