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.

Self-Assembled Monolayer of Silver Nanorods for Surface-Enhanced Raman Scattering

2007 ◽  
Vol 336-338 ◽  
pp. 2146-2148
Author(s):  
Yong Yang ◽  
Masayuki Nogami
Keyword(s):  
Raman Scattering ◽  
Field Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Detection Sensitivity ◽  
Self Assembled Monolayer ◽  
Silver Nanorods ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Self Assembled

Surface-enhanced Raman scattering (SERS) integrates high levels of sensitivity with spectroscopic precision and thus has tremendous potential for chemical and biomolecular sensing. The key to the wider application of Raman spectroscopy using roughened metallic surfaces is the development of highly enhancing substrates for analytical purposes, i.e., for better detection sensitivity of tracing contaminants and pollutants. Controlled methods for preparing nano-structured metals may provide more useful correlations between surface structure and signal enhancement. Here, we self-assembled silver nanorods on glass substrates for sensitive SERS substrates. The enhanced surface Raman scattering signals were observed and mainly attributed to the local field enhancement.

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

scholarly journals Quantizing single-molecule surface-enhanced Raman scattering with DNA origami metamolecules

2019 ◽  
Vol 5 (9) ◽  
pp. eaau4506 ◽  
Author(s):  
Weina Fang ◽  
Sisi Jia ◽  
Jie Chao ◽  
Liqian Wang ◽  
Xiaoyang Duan ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Hot Spot ◽  
Surface Enhanced Raman Scattering ◽  
Dna Origami ◽  
Sers Spectrum ◽  
Metal Nanoclusters ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Tailored metal nanoclusters have been actively developed to manipulate light at the subwavelength scale for nanophotonic applications. Nevertheless, precise arrangement of molecules in a hot spot with fixed numbers and positions remains challenging. Here, we show that DNA origami metamolecules with Fano resonances (DMFR) can precisely localize single dye molecules and produce quantified surface-enhanced Raman scattering (SERS) responses. To enable tailored plasmonic permutations, we develop a general and programmable method for anchoring a set of large gold nanoparticles (L-AuNPs) on prescribed n-tuple docking sites of super-origami DNA frameworks. A tetrameric nanocluster with four spatially organized 80-nm L-AuNPs exhibits peak-and-dip Fano characteristics. The drastic enhancement at the wavelength of the Fano minimum allows the collection of prominent SERS spectrum for even a single dye molecule. We expect that DMFR provides physical insights into single-molecule SERS and opens new opportunities for developing plasmonic nanodevices for ultrasensitive sensing, nanocircuits, and nanophotonic lasers.

scholarly journals Mechanisms in Surface Enhanced Raman Scattering

2021 ◽  
Author(s):  
◽  
Matthias Meyer
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Rayleigh Scattering ◽  
Field Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Chemical Effect ◽  
Rigorous Approach ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

<p>This thesis focusses on a number of topics in surface enhanced Raman scattering (SERS). The aim of the undertaken research was to deepen the general understanding of the SERS effect and, thereby, to clarify some of the disputed issues, among them: What is the origin of the enhancement? What is the physical or chemical effect of 'salt activation' in SERS systems? Can we observe single-molecules using SERS? Can we determine the absorbate's orientation on the surface? In part one (chapters 1-3), as a general introduction, I start with a short overview of the Raman effect and its relation to other molecular spectroscopic effects (such as fluorescence, Rayleigh scattering, etc... ). Following these basic remarks, the surface enhancementmechanisms underlying SERS are explained (as a largely electromagnetic field enhancement) and are investigated theoretically on the canonicalmodel of a nanoscopic dimer of silver spheres. The second part (chapter 4) reports on the experimental investigation (electron microscopy, in-situ Raman measurements) of a typical real SERS system: Lee & Meisel silver colloids. An emphasis is put on the self-limiting aggregation kinetics which is observed in such systems after salt addition. This is also investigated and rationalised by means of Monte-Carlo simulations which are footed on empiric theoretical considerations for the interaction potential. Part three (chapter 5) contains a discussion of the early attempts on singlemolecule SERS and points out the shortcomings of the previously used ultra-lowconcentration approach. In response, an improved andmore rigorous approach is presented: Bi-Analyte SERS. Examplary applications of the technique are discussed. Within these experiments the capability of the technique to prove/disprove (with statistical soundness) single-molecule sensitivity in any SERS system is demonstrated, and single-molecule enhancement factors are derived. The last part (chapter 6) presents computational studies based on densityfunctional theory and its use in the context of Raman spectroscopy and SERS. Of particular interest here were the Raman tensors, their visual representation appropriate in the SERS case, their relation to the relative intensities of Raman peaks, and their modification when the photon energy approaches the electronic resonance of the molecule. Last, but not least, a conclusion chapter is presented, where I highlight what has contributed by the thesis to the general understanding of the SERS effect.</p>

scholarly journals Mechanisms in Surface Enhanced Raman Scattering

2021 ◽  
Author(s):  
◽  
Matthias Meyer
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Rayleigh Scattering ◽  
Field Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Chemical Effect ◽  
Rigorous Approach ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

<p>This thesis focusses on a number of topics in surface enhanced Raman scattering (SERS). The aim of the undertaken research was to deepen the general understanding of the SERS effect and, thereby, to clarify some of the disputed issues, among them: What is the origin of the enhancement? What is the physical or chemical effect of 'salt activation' in SERS systems? Can we observe single-molecules using SERS? Can we determine the absorbate's orientation on the surface? In part one (chapters 1-3), as a general introduction, I start with a short overview of the Raman effect and its relation to other molecular spectroscopic effects (such as fluorescence, Rayleigh scattering, etc... ). Following these basic remarks, the surface enhancementmechanisms underlying SERS are explained (as a largely electromagnetic field enhancement) and are investigated theoretically on the canonicalmodel of a nanoscopic dimer of silver spheres. The second part (chapter 4) reports on the experimental investigation (electron microscopy, in-situ Raman measurements) of a typical real SERS system: Lee & Meisel silver colloids. An emphasis is put on the self-limiting aggregation kinetics which is observed in such systems after salt addition. This is also investigated and rationalised by means of Monte-Carlo simulations which are footed on empiric theoretical considerations for the interaction potential. Part three (chapter 5) contains a discussion of the early attempts on singlemolecule SERS and points out the shortcomings of the previously used ultra-lowconcentration approach. In response, an improved andmore rigorous approach is presented: Bi-Analyte SERS. Examplary applications of the technique are discussed. Within these experiments the capability of the technique to prove/disprove (with statistical soundness) single-molecule sensitivity in any SERS system is demonstrated, and single-molecule enhancement factors are derived. The last part (chapter 6) presents computational studies based on densityfunctional theory and its use in the context of Raman spectroscopy and SERS. Of particular interest here were the Raman tensors, their visual representation appropriate in the SERS case, their relation to the relative intensities of Raman peaks, and their modification when the photon energy approaches the electronic resonance of the molecule. Last, but not least, a conclusion chapter is presented, where I highlight what has contributed by the thesis to the general understanding of the SERS effect.</p>

Effect of Interparticle Field Enhancement in Self-Assembled Silver Aggregates on Surface-Enhanced Raman Scattering

Plasmonics ◽  
2014 ◽  
Vol 9 (5) ◽  
pp. 993-999 ◽  
Author(s):  
Viktoryia I. Shautsova ◽  
Viktor A. Zhuravkov ◽  
Olga V. Korolik ◽  
Andrei G. Novikau ◽  
Gvidona P. Shevchenko ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Field Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Self Assembled
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