Electrostatic interactions of cationic dyes with negatively charged polyelectrolytes in aqueous solution

Peyratout, Claire; Donath, Edwin; Daehne, Lars

doi:10.1016/s1010-6030(01)00490-7

Cited by 113 publications

(73 citation statements)

References 25 publications

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“…The density profiles along the Z direction (i.e., normal to the Au surface) as shown in Figure 5E and F confirm the close contact of dyes (15−20 Å) with opposite charges to the surface due to electrostatic attractions. 45 This MD simulation is consistent with our experimental results showing that the adsorption of counter-charged dyes could be as high as 91.2−92.6% ( Figure S12 and13). On the other hand, the dyes with the same charge as the surface would be 55−60 Å away from the surface, indicating unfavorable adsorption.…”

Section: Acs Applied Materials and Interfacessupporting

confidence: 90%

Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Sun

et al. 2016

ACS Appl. Mater. Interfaces

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Nanofabrication of multifunctional surface-enhanced Raman scattering (SERS) substrates is strongly desirable but currently remains a challenge. The motivation of this study was to design such a substrate, a versatile core−satellite Fe 3 O 4 @SiO 2 −Au (FA) hetero-nanostructure, and demonstrate its use for chargeselective detection of food dye molecules as an exemplary application. Our experimental results and three-dimensional finite difference time domain (FDTD) simulation suggest that tuning the Au nanoparticle (NP) gap to sub-10 nm, which could be readily accomplished, substantially enhanced the Raman signals. Further layer-by-layer deposition of a charged polyelectrolyte on this magnetic SERS substrate induced active adsorption and selective detection of food dye molecules of opposite charge on the substrates. Molecular dynamics (MD) simulations suggest that the selective SERS enhancement could be attributed to the high affinity and close contact (within a 20 Å range) between the substrate and molecules. Density function theory (DFT) calculations confirm the charge transfer from food dye molecules to Au NPs via the polyelectrolytes. This multifunctional SERS platform provides easy separation and selective detection of charged molecules from complex chemical mixtures.

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Section: Acs Applied Materials and Interfacessupporting

confidence: 90%

Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Sun

et al. 2016

ACS Appl. Mater. Interfaces

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“…By using fluorescence measurements Dähne and co-workers reported an optimum sulfonate/PIC molar ratio of approximately 1.8:1 for J-aggregation of PIC. [4] The difference in the optimal ratios may be related to dye counterion effects, as they used the bromide salt and we did our experiments with the iodide salt. Qualitatively, it is straightforward to understand the existence of an optimum sulfonate/dye ratio.…”

Section: Discussionmentioning

confidence: 99%

“…While J-aggregates are composed of dye molecules staggered in an edgeto-edge configuration, in H-aggregates the dye molecules align face-to-face, giving rise to a sandwich-like arrangement. [4] In solution, the extent of aggregation depends on the temperature, medium composition, and the structural features of the dye molecule, [5] but the literature contains only a few isolated attempts to control dye aggregation. For instance, Kim, Whitten and co-workers [6] have shown that the presence of excess carboxymethyl amylose leads to enhanced J-aggregation of a cyanine dye and formation of super-helical assemblies between amylose and the cyanine Jaggregates.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Formation of Cyanine Dye H‐ and J‐Aggregates with Cucurbituril Hosts in the Presence of Anionic Polyelectrolytes

Gadde

Batchelor

Kaifer

2009

Chemistry A European J

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The presence of anionic polyelectrolytes enhances the tendency of cationic cyanine dyes to form aggregates in aqueous media. In this work we investigate the interactions between two cyanine dyes, pseudoisocyanine (PIC) and pinacyanol (PIN), with polystyrenesulfonate (PSS) as the key additive to develop J- and H-aggregates. We also take advantage of the binding properties of the cucurbit[7]uril (CB7) host to control formation of these aggregates through its host-guest interactions with the dye molecules. UV/Vis absorption spectroscopic studies clearly demonstrate the PSS-enhanced formation of J-aggregates in the case of PIC and H-aggregates in the case of PIN. Electrostatic interactions between the cyanine dye molecules and the polyelectrolyte chains assist the formation of J- or H-aggregates at very low dye concentrations (ca. 10 microM). Optimum development of dye aggregates was observed at a sulfonate/dye molar ratio of about 3:1. Departures from this stoichiometric ratio seem to perturb the optimal aggregate structure. Furthermore, the presence of CB7 was found to effectively disrupt the interactions responsible for dye aggregation. Thus, CB7 completely disrupts the J-aggregates formed by PIC and the H-aggregates (as well as lower concentrations of J-aggregates) formed by PIN. UV/Vis and emission spectroscopic studies clearly indicate that binding of CB7 to both dye molecules removes them from the aggregate structures. Our spectroscopic data clearly indicate that regulation of the relative molar ratios of dye, CB7 host, and polyelectrolyte sulfonate groups leads to a quantitative control of dye aggregation, yielding variable amounts of PIC J- and PIN H-aggregates in these solutions.

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“…It was previously shown that the adsorption of PIC on PSS lead to efficient formation of J-aggregates [8]. While the monomeric PIC does not fluoresce (due to fast thermal deactivation by flip-flop motion of the two chinolyl ring system which are twisted against each other), the aggregates exhibit a narrow absorption J-band at 570 nm and strong fluorescence band with Stokes shift between them of only 3nm (Fig.…”

Section: Formation Of J-aggregates Triggered By Pssmentioning

confidence: 91%

Whispering gallery mode resonators with J-aggregates

Melnikau¹,

Savateeva²,

Hillenbrand³

et al. 2011

Opt. Express

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Abstract:We have studied the optical properties of a hybrid system consisting of cyanine dye J-aggregates attached to a spherical microcavity. A periodic structure of narrow peaks was observed in the photoluminescence spectrum of the J-aggregates, arising from the coupling between the emission of J-aggregates and the whispering gallery modes (WGMs) of the microcavity. The most striking result of our study is the observation of polarization sensitive mode damping caused by re-absorption of J-aggregate emission. This effect manifests itself in dominating emission from TM modes in the spectral region of J-aggregates absorption band where the TE modes are strongly suppressed. In contrast, the TE modes totally dominate emission spectrum in the region where absorption is negligible. We also demonstrate that the emission intensity can be further enhanced by depositing a hybrid layer of J-aggregates and Ag nanoparticles onto the spherical microcavity. Owing to the concerted action of WGMs and plasmonic hot spots in the Ag aggregates, we observe an enhanced Raman signal from the J-aggregates. Microcavities covered by Jaggregates and plasmonic nanoparticles could be thus useful for a variety of photonic applications in basic science and technology.

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Electrostatic interactions of cationic dyes with negatively charged polyelectrolytes in aqueous solution

Cited by 113 publications

References 25 publications

Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Controlling the Formation of Cyanine Dye H‐ and J‐Aggregates with Cucurbituril Hosts in the Presence of Anionic Polyelectrolytes

Whispering gallery mode resonators with J-aggregates

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Electrostatic interactions of cationic dyes with negatively charged polyelectrolytes in aqueous solution

Cited by 113 publications

References 25 publications

Multifunctional Fe3O4@SiO2–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Multifunctional Fe3O4@SiO2–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Controlling the Formation of Cyanine Dye H‐ and J‐Aggregates with Cucurbituril Hosts in the Presence of Anionic Polyelectrolytes

Whispering gallery mode resonators with J-aggregates

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Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes

Multifunctional Fe₃O₄@SiO₂–Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes