To realize a single-molecule detection device for surface-enhanced Raman scattering measurements (SERS), a new approach which use DNA origami (DO) as a sacrificial nano-structure is proposed. In this approach, gold nanoparticles (AuNPs) are precisely self-assembled to form a dimer structure on opposite faces of a rectangular DO structure. AuNP dimers with about 1.5 nm gap were successfully fabricated on silicon chip by selective removing of DO using VUV irradiation and ultrapure water rinse.
[Applications]
- Molecular detection by SERS measurement
- Further enhancement by combining the features of DNA origami
[Presentation]
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Naoki Yamashita, Zhipeng Ma, Seongsu Park, Kentaro Kawai, Yoshikazu Hirai, Toshiyuki Tsuchiya, Osamu Tabata, Micro & Nano Letters, Vol. 12, Issue 11, 2017, pp. 854-859.