期刊
ACS NANO
卷 16, 期 9, 页码 14622-14631出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c05150
关键词
DNA origami; plasmonic gap nanostructures; pattern recognition; hot spots; single-molecule SERS
A DNA origami-directed pattern recognition strategy is utilized to assemble AuNCs into shape-controllable PGNs, creating localized field enhancement in gaps to generate hot spots for stronger single-molecule SERS signals.
Gold nanocubes (AuNCs) with tunable localized surface plasmon resonance properties are good candidates for plasmonic gap nanostructures (PGNs) with hot spots (areas with intense electric field localization). Nevertheless, it remains challenging to create shape-controllable nanogaps between AuNCs. Herein, we report a DNA origami directed pattern recognition strategy to assemble AuNCs into PGNs. By tuning the position and number of capture strands on the DNA origami template, different geometrical configurations of PGNs with nanometer-precise and shape-controllable gaps are created. The localized field enhancement in these gaps can generate hot spots that are in accordance with finite difference time domain simulations. Benefiting from the single Raman probe molecule precisely anchored at these nanogaps, the dramatic enhanced electromagnetic fields localized in hot spots arouse stronger single-molecule SERS (SM-SERS) signals. This method can be utilized in the design of ultrahigh-sensitivity photonic devices with tailored optical properties and SERS-based applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据