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Figure 2 | Nanoscale Research Letters

Figure 2

From: Highly organised and dense vertical silicon nanowire arrays grown in porous alumina template on <100> silicon wafers

Figure 2

Scanning electron micrographs of porous alumina. (a) Simple anodization in oxalic acid at 40 V; insert: fast Fourier transform of the scanning electron microscopy (SEM) image. (b) Double anodization in oxalic acid at 40 V; insert: fast Fourier transform of the SEM image. (c) Cross-sectional view before widening and opening of the pore’s end with a lattice constant of 250 nm. (d) Top view after widening and opening of the pore’s end with a lattice constant of 100 nm; insert: fast Fourier transform of the SEM image. (e) Example of pore array obtained when only one third of the pores are localised using nanoimprint lithography. (f) Example of non-cylindrical pore array obtained with non-equilateral triangular lattice.

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