Figure 5

Morphology observation of the fabricated Ag NPWs. (a) An SEM image of the fabricated Ag-NPW with parameters of p = 400 nm, w = 50 nm, and t = 70 nm, respectively. (b) AFM topography of the Ag-NPW. The average thickness is 71.3 nm with good homogeneity. (c) Depth profiles along the line labeled in (b).