Interband Absorption Enhanced Optical Activity in Discrete Au@Ag Core–Shell Nanocuboids: Probing Extended Helical Conformation of Chemisorbed Cysteine Molecules |
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| Authors: | Zhi Yong Bao Prof Wei Zhang Dr Yong‐Liang Zhang Jijun He Prof Jiyan Dai Dr Chi‐Tung Yeung Dr Ga‐Lai Law Dr Dang Yuan Lei |
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| Institution: | 1. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China;2. Institute of Applied Physics and Computational Mathematics, Beijing, China;3. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | 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. |
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| Keywords: | Interbandü bergang Metallnanostrukturen Optische Aktivitä t Strukturelle Konformation Zirkulardichroismus |
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