McPeak, Kevin M. van Engers, Christian D. Blome, Mark Park, Jong Hyuk Burger, Sven Gosalvez, Miguel A. Faridi, Ava Ries, Yasmina R. Sahu, Ayaskanta Norris, David J. 2024-01-20T10:00:40Z 2024-01-20T10:00:40Z 2021-09-05 2014-05 1530-6984 https://pubs.kist.re.kr/handle/201004/126822 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 X 10(9) M-1 cm(-1)) at red wavelengths are obtained. The nanoparticles also present chiral pockets for binding. English AMER CHEMICAL SOC PLASMONIC NANOSTRUCTURES CIRCULAR-DICHROISM NANOCRYSTALS NANOFABRICATION FABRICATION CLUSTERS SHAPE Complex Chiral Colloids and Surfaces via High-Index Off-Cut Silicon Article 10.1021/nl501032j 1 NANO LETTERS, v.14, no.5, pp.2934 - 2940 NANO LETTERS 14 5 2934 2940 scie scopus 000336074800110 2-s2.0-84900478699 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article PLASMONIC NANOSTRUCTURES CIRCULAR-DICHROISM NANOCRYSTALS NANOFABRICATION FABRICATION CLUSTERS SHAPE Chiral nanoparticles anisotropic etching localized surface plasmons gold colloids circular dichroism