scholarly journals DNA origami based Au–Ag-core–shell nanoparticle dimers with single-molecule SERS sensitivity

Nanoscale ◽  
2016 ◽  
Vol 8 (10) ◽  
pp. 5612-5620 ◽  
Author(s):  
J. Prinz ◽  
C. Heck ◽  
L. Ellerik ◽  
V. Merk ◽  
I. Bald
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Hot Spots ◽  
Dna Origami ◽  
Core Shell ◽  
Dye Molecules ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

DNA origami nanostructures are used to arrange gold nanoparticles into dimers with defined distance, which can be exploited as novel substrates for surface enhanced Raman scattering (SERS). Single dye molecules (TAMRA and Cy3) can be placed into the SERS hot spots, with Raman enhancement up to 1010, which is sufficient to detect single molecules by Raman scattering.

Probing the Structure of Single-Molecule Surface-Enhanced Raman Scattering Hot Spots

2008 ◽  
Vol 130 (38) ◽  
pp. 12616-12617 ◽  
Author(s):  
Jon P. Camden ◽  
Jon A. Dieringer ◽  
Yingmin Wang ◽  
David J. Masiello ◽  
Lawrence D. Marks ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Hot Spots ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Molecule Surface

scholarly journals Raman Enhancement of Nanoparticle Dimers Self-Assembled Using DNA Origami Nanotriangles

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1684
Author(s):  
Sergio Kogikoski ◽  
Kosti Tapio ◽  
Robert Edler von Zander ◽  
Peter Saalfrank ◽  
Ilko Bald
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Resonance Effect ◽  
Field Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Dna Origami ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Self Assembled

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 106 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.

scholarly journals Quantitative Single-Molecule Surface-Enhanced Raman Scattering by Optothermal Tuning of DNA Origami-Assembled Plasmonic Nanoantennas

ACS Nano ◽  
2016 ◽  
Vol 10 (11) ◽  
pp. 9809-9815 ◽  
Author(s):  
Sabrina Simoncelli ◽  
Eva-Maria Roller ◽  
Patrick Urban ◽  
Robert Schreiber ◽  
Andrew J. Turberfield ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Surface Enhanced Raman Scattering ◽  
Dna Origami ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Plasmonic Nanoantennas ◽  
Molecule Surface
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