Dynamics of deterministically positioned single‐bond surface‐enhanced Raman scattering from DNA origami assembled in plasmonic nanogaps,Journal of Raman Spectroscopy

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Dynamics of deterministically positioned single‐bond surface‐enhanced Raman scattering from DNA origami assembled in plasmonic nanogaps
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-09-30 , DOI: 10.1002/jrs.5997
Rohit Chikkaraddy ₁ , Vladimir A Turek ₁ , Qianqi Lin ₁ , Jack Griffiths ₁ , Bart Nijs ₁ , Ulrich F Keyser ₁ , Jeremy J Baumberg ₁

Affiliation

Funding information Engineering and Physical Sciences Research Council (EPSRC), Grant/Award Numbers: EP/G060649/1, EP/L027151/1, EP/G037221/1, EPSRC NanoDTC; Isaac Newton Trust; Leverhulme Trust; Trinity College, University of Cambridge Abstract We study the dynamics of single bonds through the surface-enhanced Raman scattering (SERS) from single SERS-marker molecules containing a distinctive single alkyl bond. Assembly of the nanogaps and positioning of single molecules inside the electromagnetic hotspot are precisely controlled using DNA origami constructs. The observed SERS intensities and their spectral wandering, together with electromagnetic simulations, all confirm the role of picocavities in this nanogap geometry in allowing observation of SERS signatures from individual vibrating bonds. The strong electromagnetic field around each picocavity and the transient binding of the SERS-marker molecule reveal significant modifications to bond vibrations and selection rules over time.

中文翻译：

来自组装在等离子体纳米间隙中的 DNA 折纸的确定性定位单键表面增强拉曼散射的动力学

资助信息工程与物理科学研究委员会 (EPSRC)，资助/奖励编号：EP/G060649/1、EP/L027151/1、EP/G037221/1、EPSRC NanoDTC；艾萨克牛顿信托；莱弗休姆信托；剑桥大学三一学院摘要我们通过含有独特单烷基键的单个 SERS 标记分子的表面增强拉曼散射 (SERS) 研究单键的动力学。纳米间隙的组装和电磁热点内单个分子的定位是使用 DNA 折纸结构精确控制的。观察到的 SERS 强度及其光谱漂移，连同电磁模拟，都证实了微腔在这种纳米间隙几何结构中的作用，允许观察来自单个振动键的 SERS 特征。

更新日期：2020-09-30

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