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- Title
Dynamics of deterministically positioned single‐bond surface‐enhanced Raman scattering from DNA origami assembled in plasmonic nanogaps.
- Authors
Chikkaraddy, Rohit; Turek, Vladimir A; Lin, Qianqi; Griffiths, Jack; Nijs, Bart; Keyser, Ulrich F; Baumberg, Jeremy J
- 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.
- Subjects
DNA folding; SINGLE molecules; RADIANT intensity; ELECTROMAGNETIC fields; SERS spectroscopy
- Publication
Journal of Raman Spectroscopy, 2021, Vol 52, Issue 2, p348
- ISSN
0377-0486
- Publication type
Article
- DOI
10.1002/jrs.5997