Journal
NANO LETTERS
Volume 14, Issue 5, Pages 2934-2940Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501032j
Keywords
Chiral nanoparticles; anisotropic etching; localized surface plasmons; gold colloids; circular dichroism
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Funding
- Swiss National Science Foundation [200021-146747]
- Ramon y Cajal Fellowship Program by the Spanish Ministry of Science and Innovation
- Erasmus Student Mobility program
- Swiss National Science Foundation (SNF) [200021_146747] Funding Source: Swiss National Science Foundation (SNF)
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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.
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