Tuning the Morphology and Chiroptical Properties of Discrete Gold Nanorods with Amino Acids.
Tuning the Morphology and Chiroptical Properties of Discrete Gold Nanorods with Amino Acids.
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DOI：
10.1002/anie.201810693
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发表时间：
2018-11
影响因子：
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通讯作者：
Guangchao Zheng;Z. Bao;J. Pérez‐Juste;R. Du;Wei Liu;J. Dai;Wei Zhang;L. Lee;Kwok‐yin Wong
中科院分区：
文献类型：
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作者：
Guangchao Zheng;Z. Bao;J. Pérez‐Juste;R. Du;Wei Liu;J. Dai;Wei Zhang;L. Lee;Kwok‐yin Wong
The synthesis of discrete nanostructures with a strong, persistent, stable plasmonic circular dichroism (PCD) signal is challenging. We report a seed-mediated growth approach to obtain discrete Au nanorods with high and stable chiroptical responses (c-Au NRs) in the visible to near-IR region. The morphology of the c-Au NRs was governed by the concentration of l- or d-cysteine used. The amino acids encapsulated within the discrete gold nanostructure enhance their PCD signal, attributed to coupling of dipoles of chiral molecules with the near-field induced optical activity at the hot spots inside the c-Au NRs. The stability of the PCD signal and biocompatibility of c-Au NRs was improved by coating with silica or protein corona. Discrete c-Au NR@SiO2 with Janus or core-shell configurations retained their PCD signal even in organic solvents. A side-by-side assembly of c-Au NRs induced by l-glutathione led to further PCD signal enhancement, with anisotropic g factors as high as 0.048.
