Spectroscopic study of the interaction between rhodamine B and graphene

Raza, Syed Abbas; Naqvi, Syeda Qurat; Usman, Anwar; Jennings, James R.; Soon, Ying Woan

doi:10.1016/j.jphotochem.2021.113417

Cited by 19 publications

(18 citation statements)

References 34 publications

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“…It should be noted that the formation of emissive complexes with rhodamines is not a universal trend. In fact, previous studies have reported the formation of a nonemissive RhB-graphene complex through a combination of static and dynamic quenching mechanisms, as revealed by fluorescence quenching studies [52]. Finally, these results are consistent with an interaction between the excited DEA3HF in the inclusion complex, as well as in ethanol solution, and R6G, where the inner filter effect is believed not to be present.…”

Section: Resultssupporting

confidence: 84%

Spectroscopic Insights of an Emissive Complex between 4′-N,N-Diethylaminoflavonol in Octa-Acid Deep-Cavity Cavitand and Rhodamine 6G

et al. 2023

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Excited-state chemistry relies on the communication between molecules, making it a crucial aspect of the field. One important question that arises is whether intermolecular communication and its rate can be modified when a molecule is confined. To explore the interaction in such systems, we investigated the ground and excited states of 4′-N,N-diethylaminoflavonol (DEA3HF) in an octa acid-based (OA) confined medium and in ethanolic solution, both in the presence of Rhodamine 6G (R6G). Despite the observed spectral overlap between the flavonol emission and the R6G absorption, as well as the fluorescence quenching of the flavonol in the presence of R6G, the almost constant fluorescence lifetime at different amounts of R6G discards the presence of FRET in the studied systems. Steady-state and time-resolved fluorescence indicate the formation of an emissive complex between the proton transfer dye encapsulated within water-soluble supramolecular host octa acid (DEA3HF@(OA)2) and R6G. A similar result was observed between DEA3HF:R6G in ethanolic solution. The respective Stern–Volmer plots corroborate with these observations, suggesting a static quenching mechanism for both systems.

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Section: Resultssupporting

confidence: 84%

Spectroscopic Insights of an Emissive Complex between 4′-N,N-Diethylaminoflavonol in Octa-Acid Deep-Cavity Cavitand and Rhodamine 6G

et al. 2023

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“…In the time-dependent visible spectra obtained for the RhB aqueous solution during the catalytic and photocatalytic reactions over α-MnO 2 (Figure 11), it can be noticed that major changes in shape have occurred for the absorbance peaks with the maximum absorption at 556 nm and respectively at 498 nm. As shown in the inset of Figure 11, the rhodamine B solution displayed a large band in the visible region with the maximum absorbance at 553 nm, which can be ascribed to π→π* electronic transitions of the dye monomer and a shoulder at 515 nm corresponding to dimers [71,72]. In the acidic medium, a redshift occurred, from λ max = 553 nm to λ max = 556 nm, that was due to the carboxylic group dissociation as a result of interaction between RhB and the acid [73,74].…”

Section: Catalytic Experimentsmentioning

confidence: 99%

α-MnO2 Nanowire Structure Obtained at Low Temperature with Aspects in Environmental Remediation and Sustainable Energy Applications

et al. 2022

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Hydrothermally obtained α-MnO2 nanowire characterizations confirm the tetragonal crystalline structure that is several micrometers long and 20–30 nm in diameter with narrow distributions in their dimensions. The absorption calculated from diffuse reflectance of α-MnO2 occurred in the visible region ranging from 400 to 550 nm. The calculated band gap with Quantum Espresso using HSE approximation is ~2.4 eV for the ferromagnetic case, with a slightly larger gap of 2.7 eV for the antiferromagnetic case, which is blue-shifted as compared to the experimental. The current work also illustrates the transformations that occur in the material under heat treatment during TGA analysis, with the underlying mechanism. Electrochemical studies on graphite supports modified with α-MnO2 compositions revealed the modified electrode with the highest electric double-layer capacitance of 3.444 mF cm−2. The degradation rate of an organic dye—rhodamine B (RhB)—over the compound in an acidic medium was used to examine the catalytic and photocatalytic activities of α-MnO2. The peak shape changes in the time-dependent visible spectra of RhB during the photocatalytic reaction were more complex and progressive. In two hours, RhB degradation reached 97% under sun irradiation and 74% in the dark.

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“…41 where, τ D , τ DA , E TOT , E ET , and E CT designate the average PL lifetime of the donor only, the PL lifetime of the donor in the presence of an acceptor, the total efficiency, the energy transfer efficiency, and the electron (charge) transfer efficiency, respectively. 42 It is evident from eqn (6) that E ( E TOT ) solely depends on the difference between the PL decay lifetime of the donor–acceptor system and the donor alone. The values of K CT for various PBSA-ZnO QD dyads are estimated using the aforementioned eqn (5).…”

Section: Resultsmentioning

confidence: 99%

Exploring the photoexcited electron transfer dynamics in artificial sunscreen PBSA-coupled biocompatible ZnO quantum dots

et al. 2022

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Spectroscopic study of the interaction between rhodamine B and graphene

Cited by 19 publications

References 34 publications

Spectroscopic Insights of an Emissive Complex between 4′-N,N-Diethylaminoflavonol in Octa-Acid Deep-Cavity Cavitand and Rhodamine 6G

Spectroscopic Insights of an Emissive Complex between 4′-N,N-Diethylaminoflavonol in Octa-Acid Deep-Cavity Cavitand and Rhodamine 6G

α-MnO2 Nanowire Structure Obtained at Low Temperature with Aspects in Environmental Remediation and Sustainable Energy Applications

Exploring the photoexcited electron transfer dynamics in artificial sunscreen PBSA-coupled biocompatible ZnO quantum dots

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