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  • Title: Porosification-reduced optical trapping of silicon nanostructures.
    Author: To WK, Fu J, Yang X, Roy VA, Huang Z.
    Journal: Nanoscale; 2012 Sep 28; 4(19):5835-9. PubMed ID: 22899347.
    Abstract:
    Metal-assisted chemical etching (MACE) was carried out to fabricate solid silicon nanowires (s-SiNWs) and mesoporous silicon nanowires (mp-SiNWs). Total reflection and transmission were measured using an integrated sphere to study optical properties of the MACE-generated silicon nanostructures. Without NW aggregation, mp-SiNWs vertically standing on a mesoporous silicon layer trap less light than s-SiNWs over a wavelength range of 400-800 nm, owing to porosification-enhanced optical scattering from the rough inner surfaces of the mesoporous silicon skeletons. Porosification substantially weakens the NW mechanical strength; hence the elongated mp-SiNWs aggregate after 30 min etching and deteriorate optical trapping.
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