Figure 4.

Scanning electron micrographs of organised vertical silicon nanowire arrays grown on silicon substrates. (a) Top view with the gold catalyst at the nanowires’ end. (b) Cross-sectional view with the gold catalyst at the nanowires’ end, with a nanowire diameter of 85 nm and period of 100 nm. (c) Cross-sectional view without the gold catalyst at the nanowires’ end, with a nanowire diameter of 190 nm and period of 250 nm. (d) Cross-sectional view without the gold catalyst at the nanowires’ end grown in alumina made with orthophosphoric acid, with a nanowire diameter of 190 nm and period of 250 nm. (e) Cross-sectional view of nanowires with gold catalyst grown in alumina made with oxalic acid, with a nanowire diameter of 85 nm and period of 100 nm.

Gorisse et al. Nanoscale Research Letters 2013 8:287   doi:10.1186/1556-276X-8-287
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