期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 5, 页码 1283-1288出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201607563
关键词
circular dichroism; interband transition; metal nanostructures; optical activity; structural conformation
资金
- Hong Kong Research Grants Council (ECS) [509513]
- National Natural Science Foundation of China [11474240, 11374039, 11174042]
- National Basic Research Program of China (973 Program) [2011CB922204, 2013CB632805]
- Hong Kong Polytechnic University [1-ZE25]
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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