Site spectroscopy of Eu3+ doped- ZnS nanocrystals embedded in sodium carboxymethyl cellulose matrix

Ahemen, I.; Meludu, Osita C.; Dejene, F.B.; Viana, Bruno

doi:10.1016/j.optmat.2016.07.036

Cited by 13 publications

(3 citation statements)

References 38 publications

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“…The chelation with the two metals is affirmed with the new sharp absorption bands at values were represented in Table 2 , which assigned to the M–O (metal–oxygen) and M–Cl (metal–chloride) bonds. [ 33,57 ] The reduction of the intensity of CO band at 1600 cm −1 for the CMC–M complex confirms the sharing of carboxylate group in complexes formation. This observation emphasized the data of molar conductivity.…”

Section: Resultsmentioning

confidence: 64%

“…For the CMC, the characteristic bands near 1640 and 1425 are assigned to symmetric and asymmetric modes of stretching vibration of carbonyl (of COO) group; while the bands near 1164 cm −1 assigned to vibrations of the glucosidic COC bond. [ 57 ] With regard to St‐AG, the bands at 1634, 1414, 1154, 930, 780, and 577 cm −1 were assigned to CO bending associated with OH group, CH 2 bending, glucosidic COC, skeletal mode vibrations of α 1→4 skeletal glycoside bonds, CC stretch and skeletal modes of the pyranose ring. [ 58 ] The band at wave‐number range 1500–1000 cm −1 is assigned to out‐of‐plane bending vibration of CH group of CMC (at about 1060 cm −1 ), [ 33 ] while the appearance of two bands (1048 and 1022 cm −1 ) in case of aerogel assigned to the crystalline and amorphous content regions.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis, Characterization, Speciation, and Biological Studies on Metal Chelates of Carbohydrates with Molecular Docking Investigation

Khalf‐Alla

Basta

Lotfy

et al. 2020

Macro Materials & Eng

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The role of starch aerogel (St‐AG) and carboxymethyl cellulose (CMC) as biolgical active compounds, when they subjected for complexation with metal ions, is assessed in this work. The complexation is carried out with palladium(II) and copper(II) ions, in solid state. Different tools of analysis are carried out to characterize and elucidate the structures of these complexes, namely: elemental analysis, IR, thermal analysis, magnetic measurement and molar conductance techniques. All synthesized complexes are formed with 1:2 (metal:ligand) stoichiometry except the case of aerogel starch 1:1 (Pd:starch). All isolated complexes show a satisfactory cytotoxic effect results against colon cancer cell lines HCT11. Additionally, these complexes are screened for their antibacterial activities against two types of Gram positive and negative bacteria. Molecular docking investigation confirmed the cytotoxicity and antibacterial results. Proton–ligands association constants and their complex formation constants with some bivalent metal ions, using potentiometric method show that the complexes formed in solution have a stoichiometry of 1:1 [metal:ligand]. The effects of metal ion, ionic radius, electronegativity and nature of ligand on the formation constants are discussed. The formation constants of the complexes with 3D transition metals followed the order Mn2+ < Co2+ < Ni2+ < Cu2+ > Zn2+.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, Speciation, and Biological Studies on Metal Chelates of Carbohydrates with Molecular Docking Investigation

Khalf‐Alla

Basta

Lotfy

et al. 2020

Macro Materials & Eng

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show abstract

“…Emission peak at 384 nm of zinc sulfide QDs is due to lattice defect. Also, the emission peak at 715 nm is related to the Eu 3+ ion due to the transition of 5 D 0 to 7 F 4 [35][36][37][38][39]. Fig.…”

Section: Pl and Ftir Analysismentioning

confidence: 99%

Synthesis, feasibility study of production of singlet oxygen and hydroxyl radical and performance in antibacterial activity of ZnS:Eu QDs

Karimi

Sadeghi

Zahedifar

2022

jcc

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Eu doped zinc sulfide quantum dots (QDs) were prepared by the chemical Co-precipitation method. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and infrared Fourier transform (FT-IR) analysis were used to characterize the quantum dots. The size of nano-crystals was estimated using a Williamson Hall equation.Then, the synthesized nanoparticles were studied to investigate the antibacterial effect, containing different strains of pathogenic bacteria, and the lowest inhibitory concentration and halo diameter were calculated. WilliamsonHall equation of about 6 nm with a strain of 0.7 nm, which is match with the reported size of the SEM image.The photoluminescence spectrum (PL) of ZnS:Eu QD in excitation wavelength of 280 nm shows two emission peaks at 384 and 715 nm. In order to use these QDs as photosensitizer in photodynamic therapy, anthracene and methylene blue chemical detectors were used for detection of singlet oxygen and hydroxyl radical, respectively.The significant point for these quantum dots is that, in addition to production of hydroxyl radical, they also have the ability to produce singlet oxygen with UVC radiation. The antimicrobial effect of ZnS:Eu QDs was also investigated using a disc diffusion method on 11 microbial strains. The results of this test showed that Two microorganisms S.dysenteriae, Serotype that were resistant to the antibiotic nystatin and showed the highest sensitivity to ZnS:Eu QDs.

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Structural and optical characterization of novel [ZnKCMC]TF for optoelectronic device applications

Ibrahim

Bourezgui

Abd-Elmageed

et al. 2020

J Mater Sci: Mater Electron

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Site spectroscopy of Eu3+ doped- ZnS nanocrystals embedded in sodium carboxymethyl cellulose matrix

Cited by 13 publications

References 38 publications

Synthesis, Characterization, Speciation, and Biological Studies on Metal Chelates of Carbohydrates with Molecular Docking Investigation

Synthesis, Characterization, Speciation, and Biological Studies on Metal Chelates of Carbohydrates with Molecular Docking Investigation

Synthesis, feasibility study of production of singlet oxygen and hydroxyl radical and performance in antibacterial activity of ZnS:Eu QDs

Structural and optical characterization of novel [ZnKCMC]TF for optoelectronic device applications

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