Figure 2From: AAO-assisted synthesis of highly ordered, large-scale TiO2 nanowire arrays via sputtering and atomic layer deposition FE-SEM images of 500-nm-thick nanoporous AAO thin film on the aluminum substrate. (a) Cross-sectional results before and after TiO2 filling by (b) sputtering and (c) ALD, and (d) the surface results before and after TiO2 filling by (e) sputtering and (f) ALD.Back to article page