Chirality Nanosensor with Direct Electric Readout by Coupling of Nanofloret Localized Plasmons with Electronic Transport

Amir Ziv, Omer Shoseyov, Prajith Karadan, Brian P. Bloom, Sharone Goldring, Tzuriel Metzger, Shira Yochelis, David H. Waldeck, Roie Yerushalmi*, Yossi Paltiel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The detection of enantiopurity for small sample quantities is crucial, particularly in the pharmaceutical industry; however, existing methodologies rely on specific chiral recognition elements, or complex optical systems, limiting its utility. A nanoscale chirality sensor, for continuously monitoring molecular chirality using an electric circuit readout, is presented. This device design represents an alternative real-time scalable approach for chiral recognition of small quantity samples (less than 103 adsorbed molecules). The active device component relies on a gold nanofloret hybrid structure, i.e., a high aspect ratio semiconductor-metal hybrid nanosystem in which a SiGe nanowire tip is selectively decorated with a gold metallic cap. The tip mechanically touches a counter electrode to generate a nanojunction, and upon exposure to molecules, a metal-molecule-metal junction is formed. Adsorption of chiral molecules at the gold tip induces chirality in the localized plasmonic resonance at the electrode-tip junction and manifests in an enantiospecific current response.

Original languageAmerican English
Pages (from-to)6496-6503
Number of pages8
JournalNano Letters
Volume21
Issue number15
DOIs
StatePublished - 11 Aug 2021

Bibliographical note

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Keywords

  • chirality sensing
  • localized plasmon
  • nanosensor
  • nanowires
  • plasmon-molecular coupling

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