Ag Cylinders

Surprisingly, also in the case of Ag clusters prepared by inert gas aggregation but supported by NaCl (100), cylinders were observed [47], whereas the morphology of the clusters in the same beam but deposited on amorphous carbon films was spherelike. The structure of these spherelike clusters resembled cuboctahedra for larger clusters and that of MTPs for smaller clusters. After the deposition of the cluster on the NaCl surface, carbon was evaporated on top of the surface including the cluster. Finally, the carbon film with the clusters was removed by dissolving the NaCl in distilled water. Figure 25 shows an overview image of this preparation with two cylindrical particles. Figure 26 shows an Ag cylinder in high resolution together with the PS. It can be clearly seen that the structure is the same as that for Cu cylinders and rods, that is, truncated decahedral particles. This can be concluded by comparing PS and high-resolution images as shown in Figure 26 with those of Cu rods in Figure 22. It is not clear why cylindrical particles prepared by inert gas aggregation are produced only on NaCl surfaces. Originally, it was concluded that this happens as decoration on terrace steps. However, for such behavior the cylinders should have the same orientation. It is therefore assumed that the interaction of clusters with the chlorine of the substrate causes this effect. Investigation with using other crystalline substrates therof are in progress.

5 nm

0 0

Post a comment