Figure 7
SEM images of the pristine NdCo sample with different magnifications. In image (a), the foam-like morphology is clearly visible. Parts of the structure show connected cavities. The morphology of the wall is observable in image (b). Similar to the other samples, it is porous inside, while the outside layers are denser. However, several pores reach up to the surface and are visible as holes with a diameter of around 70 nm. Unlike in the other samples, the crystallites building up the walls are not distinguishable. The wall thickness varies from thin walls of ∼150 nm to very thick parts of ∼2.8 µm at a crossing of several cavities. |