Optical characterization of Coumarin 334 hybrid with silver nanoparticles in imidazolium-based ionic liquid

AL-Aqmar, Dalal M.; Gohary, Zenat H. El; Othman, H. A.; Kana, Maram T.H. Abou

doi:10.1016/j.dyepig.2019.01.046

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…When the concentration of Ag@SiO 2 reaches 1.520 nM, the fluorescence of RF is quenched due to the concentration effect of plasmon nanoparticles. 32 This concentration-dependent behavior highlights the critical role of relative concentrations in mediating the interaction between metal nanoparticles and fluorophores, ultimately influencing fluorescence enhancement or quenching.…”

Section: Resultsmentioning

confidence: 99%

“…Higher concentrations of metal nanoparticles can intensify the LSPR, enhancing the interaction with nearby fluorophores and consequently increasing fluorescence signals. However, excessive concentrations of silver nanoparticles may lead to aggregation or clustering, causing spatial hindrance effects that diminish fluorescence enhancement or even induce quenching . To optimize the photoluminescence enhancement (PEF) effect of Ag@SiO 2 on RF fluorescence, the fluorescence spectra of Ag@SiO 2 -RF with varying concentrations of Ag@SiO 2 are presented in Figure c.…”

Section: Resultsmentioning

confidence: 99%

“…However, excessive concentrations of silver nanoparticles may lead to aggregation or clustering, causing spatial hindrance effects that diminish fluorescence enhancement or even induce quenching. 32 To optimize the photoluminescence enhancement (PEF) effect of Ag@SiO 2 on RF fluorescence, the fluorescence spectra of Ag@SiO 2 -RF with varying concentrations of Ag@SiO 2 are presented in Figure 3c. As the concentration of Ag@SiO 2 increases, the fluorescence intensity of RF initially rises and then declines.…”

Section: Fluorescence Enhancement Of Rf By Ag@siomentioning

confidence: 99%

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Dual-Mode Detection of Cysteamine Using Ag Nanoparticle-Riboflavin Composites

Song,

Liu,

Fan

et al. 2024

ACS Appl. Nano Mater.

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Riboflavin (RF) and cysteamine (Cys) are vital in clinical and other fields, but their detection is often intricate and reliant on costly equipment and materials. Plasmon-enhanced fluorescence (PEF) using plasmonic nanoparticles offers a solution to enhance the optical properties of fluorophores. Additionally, fluorescence quenching becomes apparent when the distance between the fluorophores and nanostructures shrinks to a few nanometers. Harnessing these effects holds tremendous promise for improved detection performance. In this study, the PEF of RF by Ag@SiO 2 nanoparticles was presented and used to improve RF detection. The fluorescence enhancement of RF was "turned off" in the presence of Cys because of the aggregation of Ag@SiO 2 nanoparticles caused by Cys, which can be used for the detection of Cys. On the other hand, the quenched fluorescence of RF caused by small Ag nanoparticles was "turned on" in the presence of Cys, which can further realize the detection of Cys with lower concentrations. Additionally, the color of the Ag NPs-RF composites changed in the presence of Cys, which can also be used for the colorimetric detection of Cys. A minimum detected concentration as low as 16.6 nM was realized by fluorescence and colorimetric dual-mode detection. Depending on the interactions between the plasmonic nanoparticles and Cys, the plasmonic nanoparticles show great potential for the dual-mode detection strategy in the sensitive evaluation of analytes. The dual-mode detection based on the Ag nanoparticles provides the feasibility of the nanoprobe in potential applications, which opens a promising avenue for simple, sensitive, and selective detection.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Fluorescence Enhancement Of Rf By Ag@siomentioning

confidence: 99%

See 1 more Smart Citation

Dual-Mode Detection of Cysteamine Using Ag Nanoparticle-Riboflavin Composites

Song,

Liu,

Fan

et al. 2024

ACS Appl. Nano Mater.

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“…1). For example, in AL-Aqmar et al 3 , the amount of the absorbance was equal to 1.42,1.57 for the concentration of 1x10 -4 M of Coumarin 334, and it was also equal to 2.5 of concentration 0.3x10 -4 M of Coumarin in Abhishek et al, study 17 , while it was equal to 0.07 of the concentration 3.39x10 -9 M of the same dye in the present study. Such difference is related to the technique that is applied to determine the absorbance spectra which is presented as a long path length leading to a reduction in the background scattering and absorption losses.…”

Section: Methodsmentioning

confidence: 99%

“…It generates higher fluorescence quantum yield, good solubility, inexpensive, available, relative ease of synthesis, and responsible stability 1,2 . The optical properties of Coumarin are studied using different types of spectrometers, such as: Camspec M 501 (UV-VIS) spectrophotometer and (PF-6300) spectrofluorometer 3 , JASCO V-630 UV-VIS spectrophotometer 4 , Perkin Elmer Lambda-35 UV-VIS spectrometer 5 and Shimadzu UV-1601 double beam spectrophotometer 6 . Considering all these types of the spectrometers, the low concentration one can be studied and its properties reach microscale.…”

Section: Introductionmentioning

confidence: 99%

Spectral Behaviour of the low concentrations of Coumarin 334 with Broadband Cavity Enhanced Absorption Spectroscopy

2022

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The current research is a spectroscopic study of Coumarin 334 dissolved in methanol. The range of concentrations of the prepared stock solution was (3.39x10 -9 to 2.03x10 -8 ) M. Some optical characteristics of this dye were investigated such as absorbance and transmission spectra, absorption coefficient, refractive and extinction coefficients, oscillation and dispersion energies, and energy band gap. The absorbance spectra were recorded at 452 nm using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) which depends on increasing the path length of the traveling light from the source to the detector. The minimum absorbance amount was 0.07 with a low concentration of 3.39x10 -9 M. As a result, the other optical properties were calculated on the basis of the lowest values of absorbance. The energy band gap, which is important to detect the electronic band structure of the material, was determined; it was found to be equal to ~2.55 eV. The low values of the concentration made less collision between the molecules in the materials and the incident light. This led to a reduction in the background noise and in the percentages of losses. Furthermore, the dispersion and single oscillator energies, which help to calculate the average strength of the inter-band optical transitions and to prepare the quantifiable information about the band structure of the material, were calculated to reduce with the increasing concentrations. The refractive and extinction coefficients were determined because they are considered important factors for the optical materials and found to increase with the increasing concentrations. As a result, the study of the optical behavior of Coumarin 334 highlighted the promising materials for photonics applications at very low concentrations. All these properties are considered the main factors to determine the usefulness of the materials in advanced applications and to develop the performance of the devices which depend on the optical characteristics.

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Contributions of conformations, vibronic coupling, and hydration to photoexcitation of coumarin 334 in aqueous solution

Savenko

Kostjukov²

2022

Chem. Pap.

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Optical characterization of Coumarin 334 hybrid with silver nanoparticles in imidazolium-based ionic liquid

Cited by 9 publications

References 27 publications

Dual-Mode Detection of Cysteamine Using Ag Nanoparticle-Riboflavin Composites

Dual-Mode Detection of Cysteamine Using Ag Nanoparticle-Riboflavin Composites

Spectral Behaviour of the low concentrations of Coumarin 334 with Broadband Cavity Enhanced Absorption Spectroscopy

Contributions of conformations, vibronic coupling, and hydration to photoexcitation of coumarin 334 in aqueous solution

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