Complex chiral colloids and surfaces via high-index off-cut silicon

Kevin M. McPeak; Christian D. Van Engers; Mark Blome; Jong Hyuk Park; Sven Burger; Miguel A. Gosálvez; Ava Faridi; Yasmina R. Ries; Ayaskanta Sahu; David J. Norris

doi:10.1021/nl501032j

Complex chiral colloids and surfaces via high-index off-cut silicon

Kevin M. McPeak, Christian D. Van Engers, Mark Blome, Jong Hyuk Park, Sven Burger, Miguel A. Gosálvez, Ava Faridi, Yasmina R. Ries, Ayaskanta Sahu, David J. Norris

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

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 ⁹ M^-1 cm^-1) at red wavelengths are obtained. The nanoparticles also present chiral pockets for binding.

Original language	English (US)
Pages (from-to)	2934-2940
Number of pages	7
Journal	Nano Letters
Volume	14
Issue number	5
DOIs	https://doi.org/10.1021/nl501032j
State	Published - May 14 2014

Keywords

Chiral nanoparticles
anisotropic etching
circular dichroism
gold colloids
localized surface plasmons

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl501032j

Cite this

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title = "Complex chiral colloids and surfaces via high-index off-cut silicon",

abstract = "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 9 M-1 cm-1) at red wavelengths are obtained. The nanoparticles also present chiral pockets for binding.",

keywords = "Chiral nanoparticles, anisotropic etching, circular dichroism, gold colloids, localized surface plasmons",

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T1 - Complex chiral colloids and surfaces via high-index off-cut silicon

AU - McPeak, Kevin M.

AU - Van Engers, Christian D.

AU - Blome, Mark

AU - Park, Jong Hyuk

AU - Burger, Sven

AU - Gosálvez, Miguel A.

AU - Faridi, Ava

AU - Ries, Yasmina R.

AU - Sahu, Ayaskanta

AU - Norris, David J.

PY - 2014/5/14

Y1 - 2014/5/14

N2 - 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 9 M-1 cm-1) at red wavelengths are obtained. The nanoparticles also present chiral pockets for binding.

AB - 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 9 M-1 cm-1) at red wavelengths are obtained. The nanoparticles also present chiral pockets for binding.

KW - Chiral nanoparticles

KW - anisotropic etching

KW - circular dichroism

KW - gold colloids

KW - localized surface plasmons

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Complex chiral colloids and surfaces via high-index off-cut silicon

Abstract

Keywords

ASJC Scopus subject areas

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