Figure 4
Nanostructures on micro pits obtained using the wet etching method: (a) top view low-magnification micrograph, (b) silver on the bottom surface of the pits, and (c) high-magnification SEM image of nanostructures on the top surface of the pits. The pit sample with nanostructures that were fabricated by wet etching was indicated in Fig. 4. Because of high density of pit patterns, which limited reactant gas diffusion, wet chemical fluid could not react successfully during the etching process. This sample showed the worst performance of absorption among hybrid structures.
