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Complex Chiral Colloids and Surfaces via High-Index Off-Cut Silicon
McPeak, Kevin M.,van Engers, Christian D.,Blome, Mark,Park, Jong Hyuk,Burger, Sven,Gosá,lvez, Miguel A.,Faridi, Ava,Ries, Yasmina R.,Sahu, Ayaskanta,Norris, David J. American Chemical Society 2014 NANO LETTERS Vol.14 No.5
<P>Silicon wafers are commonly etched in potassium hydroxide solutions to form highly symmetric surface structures. These arise when slow-etching {111} atomic planes are exposed on standard low-index surfaces. However, the ability of nonstandard high-index wafers to provide more complex structures by tilting the {111} planes has not been fully appreciated. We demonstrate the power of this approach by creating chiral surface structures and nanoparticles of a specific handedness from gold. When the nanoparticles are dispersed in liquids, gold colloids exhibiting record molar circular dichroism (>5 × 10<SUP>9</SUP> M<SUP>–1</SUP> cm<SUP>–1</SUP>) at red wavelengths are obtained. The nanoparticles also present chiral pockets for binding.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-5/nl501032j/production/images/medium/nl-2014-01032j_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl501032j'>ACS Electronic Supporting Info</A></P>