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Observation of Enantiomeric Switching of Individual Plasmonic Metamolecules
Nano Letters ( IF 9.6 ) Pub Date : 2023-05-24 , DOI: 10.1021/acs.nanolett.3c01159
Qin Zhang 1, 2 , Xiaoyao Wang 2, 3 , Huiying Wu 2, 3 , Jinjin Zhang 2, 4 , Xingyue Lin 1 , Jiaoyang Sa 1 , Hao Li 1 , Chao Zhou 2, 3 , Weihai Ni 1
Affiliation  

Active plasmonic metamolecules under microscopic observation are promising for optical reporters in single molecule sensing applications. While self-assembled reconfigurable chiral plasmonic metamolecules can be conveniently engineered with sensing functionalities, their observation is usually based on ensemble measurements, where the chiroptical response of enantiomers tend to cancel each other in ensemble circular dichroism. Herein, we demonstrate microscopic observation of enantiomeric switching of individual active DNA origami-assembled plasmonic metamolecules. The metamolecules are immobilized on a glass substrate in a microfluidic chamber, in which the plasmonic metamolecule can maintain their activities upon certain local stimuli as in solution. In circular differential scattering, two enantiomeric states controlled by the strand-displacement reaction display opposite spectral signals to each other, representing successful enantiomeric switching of the chirality. Moreover, in a close-to-racemic mixture of chiral metamolecules controlled by pH-sensitive strands, the coexistence of enantiomeric individuals, which is concealed in ensemble measurements, is clearly identified.

中文翻译:

观察单个等离子体超分子的对映体转换

显微观察下的活性等离子体超分子对于单分子传感应用中的光学报告分子是有前途的。虽然可以方便地设计具有传感功能的自组装可重构手性等离子体超分子,但它们的观察通常基于整体测量,其中对映体的手性光学响应往往在整体圆二色性中相互抵消。在此,我们展示了对单个活性 DNA 折纸组装的等离子体超分子的对映体转换的显微观察。超分子固定在微流体室中的玻璃基板上,其中等离子体超分子可以在某些局部刺激下保持其活性,如在溶液中。在圆微分散射中,由链置换反应控制的两个对映体状态显示彼此相反的光谱信号,代表手性的成功对映体转换。此外,在由 pH 敏感链控制的接近外消旋的手性超分子混合物中,可以清楚地识别出隐藏在整体测量中的对映体个体的共存。
更新日期:2023-05-24
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