Investigation of photophysical and binding properties of Rose Bengal dye on graphene oxide and polyethyleneimine-functionalized graphene oxide nanocomposites

Bayraktutan, Tuğba

doi:10.1007/s11696-020-01130-4

Cited by 12 publications

(12 citation statements)

References 49 publications

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“…Dye-sensitization of the film electrodes for 12, 18, and 24 hours duration has improved the absorbance but covers the same visible region respectively as shown in Figure 5 (2,6,15) . The overall absorption of the sensitized films appears different as compared to that of the bare as-grown and annealed films.…”

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 69%

“…It has been reported that the refractive index of thin films decreases as the porosity increases (8,14) . This lowering of the refractive index may be due to the trapping of air (refractive index of air is unity) from the ambient atmosphere by the porous centers in the as-grown films (15) . A slight increase of particle size from 4 nm to 6 nm on annealing might have reduced the void spaces in the film and as a result, annealed films are relatively less porous and exhibit a higher refractive index.…”

Section: Optical and Electrical Propertiesmentioning

confidence: 99%

“…Photo-induced transfer of charge carrier occurs only when there is a favorable energy difference between LUMO of the RB dye and the conduction band of SnO 2 (16,17) . Electrochemical data gives the necessary information and lets the estimation of relative positions of HOMO and LUMO levels of the materials used (15,16,18) . RB has an oxidation potential (E ox ) of 1.10 V, reduction potential (E red ) of -0.95 V, HOMO potential level of -5.85 eV, and LUMO potential level of -3.82 eV (15) .…”

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 99%

“…Electrochemical data gives the necessary information and lets the estimation of relative positions of HOMO and LUMO levels of the materials used (15,16,18) . RB has an oxidation potential (E ox ) of 1.10 V, reduction potential (E red ) of -0.95 V, HOMO potential level of -5.85 eV, and LUMO potential level of -3.82 eV (15) . With this valuable information, the energy level diagram of SnO 2 /RB constructed is shown in Figure 4.…”

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 99%

“…The excited state level of the photo-sensitizer RB is higher in energy than the conduction band edge of the n-type semiconductor SnO 2 film electrode used. Therefore, an efficient electron transfer process between the excited dye and conduction band of the semiconductor will take place (6,15,18) . Absorption spectra of the dye-sensitized as-grown and annealed SnO 2 films for 12, 18, and 24-hour duration together and the bare as-grown and annealed films are shown inFigure 5.…”

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 99%

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Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

Murali¹,

Arts²,

Remadevi³

2021

IJST

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Objectives: To develop organic dye sensitized film electrodes from highly porous tin oxide (SnO 2 ) thin films prepared at room temperature using the SILAR technique. Methods/Analysis: SnO 2 films were fabricated by the successive ionic layer adsorption and reaction (SILAR) technique at room temperature and its sensitization was done using the organic dye Rose Bengal (RB). The effect of sensitization on the as-grown and annealed film electrodes was investigated. Findings: Crystalline films with cauliflower-like morphology exhibit a large inherent adsorptive surface area and exhibit steady transmittance of 60-80% in the visible region. As-grown SnO 2 films possess higher porosity and lower refractive index than that of the annealed films. SnO 2 films have a resistivity in the range of 10 -2 -10 -3 Ωcm. The dye adsorbed SnO 2 film electrodes have much higher absorbance and cover a broad visible region compared to the bare SnO 2 film electrodes. RB sensitization leads to an accelerated improvement in absorbed photon energy through the visible region of the spectrum extending from 2 to 3.75 eV. Novelty: Contrary to the sophisticated methods of preparation in the reported literature, highly porous crystalline SnO 2 thin films were prepared at room temperature, using glacial acetic acid and hydrogen peroxide by a cost-effective simple wet chemical method. Work demonstrates that SnO 2 films sensitized with RB act as an excellent dye-sensitized electrode, which can absorb almost half the visible spectrum (400-600 nm) of solar radiations. We believe that this is the unique report of surface modification of wet chemically prepared SnO 2 electrodes by the photo-sensitizer RB.

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Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 69%

Section: Optical and Electrical Propertiesmentioning

confidence: 99%

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 99%

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 99%

Section: Photo-characteristics Of Sensitized Sno 2 Filmsmentioning

confidence: 99%

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Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

Murali¹,

Arts²,

Remadevi³

2021

IJST

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Detection of protamine based on competitive adsorption onto the surface of functionalized multi‐walled carbon nanotubes

Yiğit,

Bayraktutan

2023

Luminescence

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In this study, an adsorption‐based determination system was designed for protamine. A multi‐walled carbon nanotube (MWCNT), which is a strong adsorbent, was used. The competitive adsorption process between dyes and protamine formed the basis of the sensor system. The adsorption process was followed over the dyes by UV‐vis absorption spectroscopy. The achievability of this sensor system was supported by the thermodynamic parameters. Transmission electron microscopy (TEM) and Fourier Transform infrared spectroscopy (FTIR) techniques were used for characterization of the sensor system. It was determined that the sensor system remained stable at physiological temperature and pH range. Limit of detection (LOD) values of PyB‐COO—MWCNT and PyY‐COO—MWCNT systems were calculated as 1.32 and 1.12 ngml‐1, respectively. The applicability of the sensor systems was demonstrated by operating in bovine serum solutions.

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Molecular Insights on the Modulated Acetylcholinesterase Inhibition Activity of Tacrine Adsorbed on Biocompatible Graphene Oxide

et al. 2023

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Graphene oxide (GO) based nano‐formulation has gained much attention because of its carbonaceous composition with biologically benign properties. In this study, the interactions of GO with tacrine (TAC), an FDA approved Alzheimer's disease (AD) drug, are explored using various analytical tools and theoretical modeling techniques. Furthermore, the modulatory effect of these nano‐conjugates toward the in‐vitro catalytic activity of the neurodegenerative enzyme acetylcholinesterase (AChE) is also quantified. The maximal rate for enzyme inhibition in presence of the nanoconjugate decreases up to an extent of 16 and 34 % in comparison with TAC and GO, respectively. Interestingly, these results are in sharp contrast to the increased AChE activity on adsorption into spherical gold and silver nanoparticles. The current findings demonstrate the synergistic use of TAC−GO hybrid material with augmented AChE inhibition efficacy towards the treatment of Alzheimer's disease (AD). Additionally, GO presents a sustainable alternative for biomedical applications to inorganic equivalents.

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Investigation of photophysical and binding properties of Rose Bengal dye on graphene oxide and polyethyleneimine-functionalized graphene oxide nanocomposites

Cited by 12 publications

References 49 publications

Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

Detection of protamine based on competitive adsorption onto the surface of functionalized multi‐walled carbon nanotubes

Molecular Insights on the Modulated Acetylcholinesterase Inhibition Activity of Tacrine Adsorbed on Biocompatible Graphene Oxide

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