Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
Discusses Au nanoparticle and Fe2O3 support evolution as a function of temperature. A significant amount of Au was initially leached from the Fe2O3 surface. The voids in the Fe2O3 shrink significantly at only 500° C, and the small Au nanoparticles coalesce into larger particles. The authors use through focus techniques (depth sectioning) made possible by the large incident beam semiangle in the STEM. This helped them observe the position of the Au particles relative to the voids in the Z direction. The TEM used was a JEOL 2200FS Cs corrected STEM.