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Chiroptical study of the bimetal–cysteine hybrid composite: interaction between cysteine and Au/Ag alloyed nanotubes

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Abstract

The coupling between noble metal nanostructures and chiral molecules gives rise to strong chiroptical responses in the range from the ultraviolet (UV) to visible spectrum. In this work, cysteine-modified Au/Ag alloyed nanotubes (ANTs) have been prepared by coupling cysteine with Au/Ag ANTs. The chiroptical responses strongly depend on the chirality of cysteine and show clear mirrored behaviours. In contrast to Ag- or Au-cysteine chiral hybrid nanorods, the cysteine-modified Au/Ag ANTs exhibit higher chiroptical responses due to a stronger local electromagnetic field. The induced CD signals emerge in the interband absorption region of Au/Ag ANTs rather than in the local surface plasmon bands, which can be attributed to both the extended helical network conformation on the surface of Au/Ag ANTs and the near-field enhancement effect of plasmonic nanotubes. This confirms that Coulomb interaction induces coupling between cysteine and Au/Ag ANTs, which allows cysteine molecules to form an extended helical network on the surface of Au/Ag ANTs. Furthermore, the cysteine-modified Au/Ag ANTs also show excellent chiral recognition for amino acids in catalytic electrochemical reactions due to the presence of chiral active sites and the steric effect of large groups.

Graphical abstract: Chiroptical study of the bimetal–cysteine hybrid composite: interaction between cysteine and Au/Ag alloyed nanotubes

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Publication details

The article was received on 28 Aug 2019, accepted on 17 Oct 2019 and first published on 18 Oct 2019


Article type: Paper
DOI: 10.1039/C9NR07421J
Nanoscale, 2019, Advance Article

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    Chiroptical study of the bimetal–cysteine hybrid composite: interaction between cysteine and Au/Ag alloyed nanotubes

    H. Liu, Z. Li, Y. Yan, J. Zhao and Y. Wang, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR07421J

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