3 years ago

DNA Origami Directed Assembly of Gold Bowtie Nanoantennas for Single Molecule Surface-Enhanced Raman Scattering

Guowei Lu, Jia Shi, Ting Wang, Yingbo He, Te Wen, Xinfeng Liu, Zhen-gang Wang, Baoquan Ding, Pengfei Zhan
Metallic bowtie nanoarchitecture can produce dramatic electric field enhancement which is advantageous in single molecule analysis and optical information processing. In the present study, we successfully constructed plasmonic bowtie nanostructures using a DNA origami-based bottom-up assembly strategy, which enables precise control over the geometrical configuration of the bowtie with an approximate 5 nm gap. We accurately positioned a single Raman probe at the gap of the bowtie. Single molecule surface-enhanced Raman scattering (SM-SERS) of individual nanostructures, including ones containing an alkyne group, was observed. Our design achieved repeatable local field enhancement of several orders of magnitude. Our method opens the door on a novel strategy for the fabrication of metal bowtie structures and SM-SERS, which can be utilized in the design of highly-sensitive photonic devices.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201712749

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