Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

Toropov, N. A.; Parfenov, Peter S.; Vartanyan, T. A.

doi:10.1021/jp505234j

Cited by 27 publications

(12 citation statements)

References 28 publications

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“…It is due to the near fields of silver nanoparticles. In accordance to our assessments, the enhancement of the near fields for these particles reaches 400-fold depending on the shape of nanoparticles [6]. Also optical density of rhodamine molecules in proximity of nanoparticles is enhanced for rhodamine layer isolated by PMMA (sample 4) and rhodamine in PMMA matrix (sample 6).…”

Section: E Xperimentalsupporting

confidence: 88%

Photoluminescence of the polymer/dye composites with different geometry in the near fields of Ag nanostructures

Toropov

Vartanyan

Krutyakova

2014

2014 IEEE 9th Nanotechnology Materials and Devices Conference (NMDC)

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In this work we obtained a highly fluorescent planar material based on a mixture of organic molecules and Ag nanoparticles. Silver nanoparticles were vacuum-deposited on the sapphire surface. The morphology of these samples was characterized by SEM. Then, they were covered by rhodamine 6G and poly(methyl methacrylate) (PMMA) layers with different geometry. As a result, we observed the enhancement of rhodamine absorption in the near fields of Ag nanoparticles. On the other hand, the enhancement of the photoluminescence of rhodamine was only for the samples with an isolating PMMA layer and PMMA as a matrix for rhodamine molecules. In the latter case, the photoluminescence of the rhodamine 6G with silver nanoparticles was 22-fold more intense than on a substrate without nanoparticles.Metallic nanostructures, in particular, planar nanoparticles arrays, are widely used for development of novel photonic materials and devices such as sensors [1], photodetectors [2] etc. The main reason for that is the huge enhancement of the near fields around the nanoparticles provided the incident radiation is at resonance with the localized plasmon excitations. It is known that silver nanoparticles possess plasmon resonances in the visible range of spectrum. The field enhancement, in its turn, leads to an increase of absorption, fluorescence, and Raman scattering as well as to the initiation of photochemical reactions in organic molecules placed in the close proximity of metal nanoparticles [3,4]. While the increase of absorption and Raman scattering are rather robust effects, the increase of the fluorescence intensity is much more subtle. A number of authors have reported the fluorescence quenching of molecules on the metallic surface rather than the expected enhancement [5].In this work, we strive to obtain a highly fluorescent planar material based on a mixture of organic molecules and silver nanoparticles. II. E XPERIMENTALWe used three pairs of samples with different geometry. First of them was prepared from rhodamine 6G layers on the sapphire surface with and without inclusion of the silver nanoparticles (samples 2 and 3, see table I). For these purposes the solution of rhodamine 6G in alcohol was spread 145 over the substrate using evaporation technique. Silver nanoparticles (sample 1) were preliminary vacuum-deposited on the sapphire surface kept at the temperature of 220°C. The amount of deposited silver was equivalent to 5 nm thick continuous metal film. The morphology of these samples was characterized by SEM. The Ag nanoparticles were 10-30 nm size in diameter. Then, they were also covered by a rhodamine 6G layer.In order to isolate metal surface of nanoparticles we used poly(methyl methacrylate). PMMA layers were made by evaporation technique of the solution of PMMA in toluene. Thus, second pair of samples comprised the sapphire substrate with and without Ag nanoparticies covered by a 4-nm buffer layer of PMMA and rhodamine 6G layer (samples 4 and 5).The thickness of PMMA layer was verified by ellipsometry technique.For ...

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Section: E Xperimentalsupporting

confidence: 88%

Photoluminescence of the polymer/dye composites with different geometry in the near fields of Ag nanostructures

Toropov

Vartanyan

Krutyakova

2014

2014 IEEE 9th Nanotechnology Materials and Devices Conference (NMDC)

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“…After annealing, the reflection spectra narrowed as compared to non-annealed samples. This narrowing is due to the modification of the silver nanostructure morphology by surface diffusion of silver atoms on which the optical properties of metallic island films depends strongly (Kelly et al 2003;Toropov et al 2012Toropov et al , 2014Gladskikh et al 2014). …”

Section: Resultsmentioning

confidence: 99%

Correlation between structural, optical, and electrical properties of self-assembled plasmonic nanostructures on the GaAs surface

Gladskikh

Toropov

et al. 2015

J Nanopart Res

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Self-assembled silver nanostructures on the industry-grade monocrystalline GaAs (100) wafer surface were obtained via physical vapor deposition and characterized by optical reflection spectroscopy, scanning electron microscopy, and current-voltage curve measurements. Reflection spectra of the samples with Ag equivalent thicknesses of 5, 7.5, and 10 nm demonstrated wide plasmonic bands in the visible range of spectra. Thermal annealing of the nanostructures led to narrowing of the plasmonic bands caused by major transformations of the film morphology. While the As prepared films predominantly had a small-scale labyrinth structure, after annealing wellseparated silver nanoislands are formed on the gallium arsenide surface. A clear correlation between films morphology and their optical and electrical properties is elucidated. Annealing of the GaAs substrate with Ag nanostructures at 100°C under control of the resistivity allowed us to obtain and fix the structure at the percolation threshold. It is established that the samples at the percolation threshold possess the properties of resistance switching and hysteresis.

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“…8 The aforesaid ability of cyanines to self-organize is invaluable for many applications and has been extensively studied in solution, where dimers and higher-order H-or J-type aggregates were observed. [10][11][12][13][14][15][16][17][18] Moreover, the aggregation properties of several cyanine derivatives were also studied at liquid/water or air/water interfaces using surface second harmonic generation (SSHG). [19][20][21][22][23][24][25][26] Steady-state, time-resolved (TR) SSHG as well as SHG microscopy were applied to obtain information about their adsorption, orientation and dynamics properties.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent DNA probes at liquid/liquid interfaces studied by surface second harmonic generation

Licari

Brevet

Vauthey

2016

Phys. Chem. Chem. Phys.

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The properties of a series of oxazole yellow dyes, including the dicationic YOPRO-1 and its homodimeric parent YOYO-1 and two monocationic dyes (YOSAC-1 and YOSAC-3), have been investigated at the dodecane/water interface using stationary and time-resolved surface second harmonic generation (SSHG) combined with quantum chemical calculations. Whereas YOYO-1 exists predominantly as a H-dimer in aqueous solution, the stationary SSHG spectra reveal that such dimers are not formed at the interface. No significant H-aggregation was observed with YOPRO-1, neither in solution nor at the interface. In the case of the monocationic YOSAC dyes, a distinct SSHG band due to H-aggregates was measured at the interface, whereas only weak aggregation was found in solution. These distinct aggregation behaviors can be explained by the different orientations of the dyes at the interface, as revealed from the analysis of polarization-resolved experiments, the doubly-charged dyes lying more flat on the interface than the singly charged ones. Although YOYO-1 and YOPRO-1 do not form H-dimer/aggregates at the interface, time-resolved SSHG measurements point to the occurrence of intra- and intermolecular interactions, respectively, which inhibit the ultrafast non-radiative decay of the excited dyes via large amplitude motion, and lead to a nanosecond excited-state lifetime. The distinct behavior evidenced here for YOYO-1 and YOSAC dyes points to their potential use as fluorescent or SHG interfacial probes.

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Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

Cited by 27 publications

References 28 publications

Photoluminescence of the polymer/dye composites with different geometry in the near fields of Ag nanostructures

Photoluminescence of the polymer/dye composites with different geometry in the near fields of Ag nanostructures

Correlation between structural, optical, and electrical properties of self-assembled plasmonic nanostructures on the GaAs surface

Fluorescent DNA probes at liquid/liquid interfaces studied by surface second harmonic generation

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