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

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)2934-2940
Number of pages7
JournalNano Letters
Volume14
Issue number5
DOIs
StatePublished - May 14 2014

Fingerprint

Colloids
Silicon
colloids
Nanoparticles
Surface structure
nanoparticles
silicon
Gold
wafers
gold
Gold Colloid
potassium hydroxides
Potassium hydroxide
handedness
Dichroism
Silicon wafers
dichroism
Etching
etching
Wavelength

Keywords

  • anisotropic etching
  • Chiral nanoparticles
  • circular dichroism
  • gold colloids
  • localized surface plasmons

ASJC Scopus subject areas

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

Cite this

McPeak, K. M., Van Engers, C. D., Blome, M., Park, J. H., Burger, S., Gosálvez, M. A., ... Norris, D. J. (2014). Complex chiral colloids and surfaces via high-index off-cut silicon. Nano Letters, 14(5), 2934-2940. https://doi.org/10.1021/nl501032j

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; Gosálvez, Miguel A.; Faridi, Ava; Ries, Yasmina R.; Sahu, Ayaskanta; Norris, David J.

In: Nano Letters, Vol. 14, No. 5, 14.05.2014, p. 2934-2940.

Research output: Contribution to journalArticle

McPeak, KM, Van Engers, CD, Blome, M, Park, JH, Burger, S, Gosálvez, MA, Faridi, A, Ries, YR, Sahu, A & Norris, DJ 2014, 'Complex chiral colloids and surfaces via high-index off-cut silicon', Nano Letters, vol. 14, no. 5, pp. 2934-2940. https://doi.org/10.1021/nl501032j
McPeak KM, Van Engers CD, Blome M, Park JH, Burger S, Gosálvez MA et al. Complex chiral colloids and surfaces via high-index off-cut silicon. Nano Letters. 2014 May 14;14(5):2934-2940. https://doi.org/10.1021/nl501032j
McPeak, Kevin M. ; Van Engers, Christian D. ; Blome, Mark ; Park, Jong Hyuk ; Burger, Sven ; Gosálvez, Miguel A. ; Faridi, Ava ; Ries, Yasmina R. ; Sahu, Ayaskanta ; Norris, David J. / Complex chiral colloids and surfaces via high-index off-cut silicon. In: Nano Letters. 2014 ; Vol. 14, No. 5. pp. 2934-2940.
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