TY  - JOUR
A1  - Kogikoski Junior, Sergio
A1  - Tapio, Kosti
A1  - Edler von Zander, Robert
A1  - Saalfrank, Peter
A1  - Bald, Ilko
T1  - Raman enhancement of nanoparticle dimers self-assembled using DNA origami nanotriangles
T2  - Molecules : a journal of synthetic chemistry and natural product chemistry / Molecular Diversity Preservation International
N2  - Surface-enhanced Raman scattering is a powerful approach to detect molecules at very low concentrations, even up to the single-molecule level. One important aspect of the materials used in such a technique is how much the signal is intensified, quantified by the enhancement factor (EF). Herein we obtained the EFs for gold nanoparticle dimers of 60 and 80 nm diameter, respectively, self-assembled using DNA origami nanotriangles. Cy5 and TAMRA were used as surface-enhanced Raman scattering (SERS) probes, which enable the observation of individual nanoparticles and dimers. EF distributions are determined at four distinct wavelengths based on the measurements of around 1000 individual dimer structures. The obtained results show that the EFs for the dimeric assemblies follow a log-normal distribution and are in the range of 10(6) at 633 nm and that the contribution of the molecular resonance effect to the EF is around 2, also showing that the plasmonic resonance is the main source of the observed signal. To support our studies, FDTD simulations of the nanoparticle's electromagnetic field enhancement has been carried out, as well as calculations of the resonance Raman spectra of the dyes using DFT. We observe a very close agreement between the experimental EF distribution and the simulated values.
KW  - surface-enhanced Raman scattering
KW  - DNA origami
KW  - resonance Raman
KW  - scattering
KW  - nanoparticle dimers
Y1  - 2021
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/60547
SN  - 1420-3049
VL  - 26
IS  - 6
PB  - MDPI
CY  - Basel
ER  -