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

Shautsova, V.I.; Zhuravkov, V. A.; Королик, О. В.; Novikau, A. G.; Шевченко, Г. П.; Гайдук, П. И.

doi:10.1007/s11468-014-9706-3

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…At dipolar plasmon resonance, the plasmonic charges (SALC eigenstate) are distributed over two hemispheres of opposite signs aligned on the incident electric field direction. This theoretical result is in line with those (i) of the analytic description of a sphere in the quasi-static regime [53,54] and (ii) of the more sophisticated and demanding electromagnetic simulations conducted by FDTD [55,56], DDA [57] and BEM [49].…”

Section: 22supporting

confidence: 87%

Plasmonics of regular shape particles, a simple group theory approach

et al. 2020

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A simple hand calculation method based on group theory is proposed to predict the near field maps of finite metallic nanoparticles of canonical geometries: prism, cube, hexagon, disk, sphere, etc corresponding to low order localized surface plasmon resonance excitations. In this article, we report the principles of the group theory approach and demonstrate, through several examples, the general character of the group theory method which can be applied to describe the plasmonic response of particle of finite or infinite symmetry point groups. Experimental validation is achieved by collection of high-resolution subwavelength near-field maps by photoemission electron microscopy (PEEM) on a representative set of Au colloidal particles exhibiting either finite (hexagon) or infinite (disk, sphere) symmetry point groups.

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Section: 22supporting

confidence: 87%

Plasmonics of regular shape particles, a simple group theory approach

et al. 2020

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“…It is well known that a marked improvement of SERS sensitivity takes place within the nano gaps between metal nanoparticles due to electric field enhancement there. Thus, aggregation of the metal nanoparticles can give rise to hot spots for SERS [ 34 , 35 ]. For example, it has been shown that aggregation of colloidal silver nanoparticles into flakes using salts can considerably improve SERS reproducibility as well as the limit of detection as aggregation provides the necessary hot spots [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching

et al. 2021

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In this study, we developed highly sensitive substrates for Surface-Enhanced-Raman-Scattering (SERS) spectroscopy, consisting of silicon nanowires (SiNWs) decorated by silver nanostructures using single-step Metal Assisted Chemical Etching (MACE). One-step MACE was performed on p-type Si substrates by immersion in AgNO3/HF aqueous solutions resulting in the formation of SiNWs decorated by either silver aggregates or dendrites. Specifically, dendrites were formed during SiNWs’ growth in the etchant solution, whereas aggregates were grown after the removal of the dendrites from the SiNWs in HNO3 aqueous solution and subsequent re-immersion of the specimens in a AgNO3/HF aqueous solution by adjusting the growth time to achieve the desired density of silver nanostructures. The dendrites had much larger height than the aggregates. R6G was used as analyte to test the SERS activity of the substrates prepared by the two fabrication processes. The silver aggregates showed a considerably lower limit of detection (LOD) for SERS down to a R6G concentration of 10−13 M, and much better uniformity in terms of detection in comparison with the silver dendritic structures. Enhancement factors in the range 105–1010 were calculated, demonstrating very high SERS sensitivities for analytic applications.

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“…Intensification of the Brownian motion of the molecules in the pores of the primary silver nanoparticles promotes the moving apart of smaller silver nanoparticles that form a loose shell, and partial destruction of this shell-the primary porous nanoparticle starts to break up. An additional circumstance contributing to significant heating of the porous shell can be a huge gain of local fields, which is caused by the dense packing of small silver nanoparticles in the shell [14].…”

Section: Resultsmentioning

confidence: 99%

“…This reduces the efficiency of plasmonic nanostructures that would be used in highly sensitive spectroscopic techniques such as SERS and SEF and in solving problems of biosensor technique. The proposed method [12][13][14] of silver nanoparticle synthesis in the presence of ligands without silver ion reducing agent and polymer stabilizers is of interest in this regard.…”

Section: Introductionmentioning

confidence: 99%

Unusual transient absorption dynamics of silver nanoparticles in solutions of carboxylated amine complexons

Шевченко

Zhuravkov

Tret’yak

et al. 2016

Adv. Nat. Sci: Nanosci. Nanotechnol.

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We present the results of research on fast relaxation dynamics in the electronic excitation of silver nanoparticles synthesized in the presence of carboxylated amine complexons (NTA, Na 2 EDTA, DTPA) without any reductant or polymeric stabilizer. Unusual transient absorption dynamics in these objects after femtosecond laser irradiation was found, manifesting as the appearance of an additional long-lived bleaching band. The effect may be assigned to the inhomogeneous and porous shell of silver nanoparticles synthesized by such a procedure, as the consequence of a partial fragmentation of this shell due to heating under femtosecond laser excitation of plasmonic nanoparticles and subsequent electron-phonon energy relaxation.

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

Cited by 6 publications

References 36 publications

Plasmonics of regular shape particles, a simple group theory approach

Plasmonics of regular shape particles, a simple group theory approach

Improved Surface-Enhanced-Raman Scattering Sensitivity Using Si Nanowires/Silver Nanostructures by a Single Step Metal-Assisted Chemical Etching

Unusual transient absorption dynamics of silver nanoparticles in solutions of carboxylated amine complexons

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