Interband Absorption Enhanced Optical Activity in Discrete Au@Ag Core–Shell Nanocuboids: Probing Extended Helical Conformation of Chemisorbed Cysteine Molecules

Zhi Yong Bao, Wei Zhang, Yong Liang Zhang, Jijun He, Jiyan Dai, Chi Tung Yeung, Ga Lai Law, Dangyuan Lei

Research output: Journal article publicationJournal articleAcademic researchpeer-review

46 Citations (Scopus)

Abstract

� 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Detailed understanding of the interaction between a chiral molecule and a noble metal surface is essential to rationalize and advance interfacial self-assembly of amino acids and metal-mediated anchoring of proteins. Here we demonstrate that individual Au@Ag core–shell nanocuboids can serve as a plasmonic reporter of an extended helical network formed among chemisorbed cysteine molecules, through generating an interband absorption enhanced, Ag-surface-exclusive circular dichroism (CD) band in the UV region. The observed unusual, strong CD response in the hybrid Au@Ag–cysteine system can be used to probe in real time conformational evolution and structural rearrangement of biomolecules in general and also monitor the interfacial interaction between a metal surface and an adsorbed molecule, opening up the possibility of using Ag nanostructures as promising stereochemically attuned nanosensors.
Original languageEnglish
Pages (from-to)1283-1288
Number of pages6
JournalAngewandte Chemie - International Edition
Volume56
Issue number5
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • circular dichroism
  • interband transition
  • metal nanostructures
  • optical activity
  • structural conformation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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