Synthesis and characterization of CdS nanoparticles prepared by precipitation in the presence of span 20 as surfactant

Waly, S. A.; Shehata, M.M.; Mahmoud, Hazem H.

doi:10.1134/s1070427217020203

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…Specifically, EDS analysis of the nanoparticles obtained from Cys showed signals associated to Cd and S elements, while the XRD taken from the nanoparticles synthesized from Cys and Met as sole sulfur source, indicated the formation of cubic nanocrystals of CdS, which are related to the diffraction of the crystalline planes (111), (220), and (311). The same XRD pattern has been reported for the CdS QDs obtained via chemical (Waly et al, 2017; Bharti et al, 2018; Wang et al, 2018) and biological synthesis (Sankhla et al, 2016; Chakraborty et al, 2018). XPS analysis was developed in the 1960 by Siegbahn’s research group and, since then, it has been widely used to determine the chemical composition and state of elements present on a sample surface (Siegbahn et al, 1967).…”

Section: Discussionsupporting

confidence: 74%

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

et al. 2019

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Previously we reported the biosynthesis of intracellular cadmium sulfide quantum dots (CdS QDs) at low temperatures by the Antarctic strain Pseudomonas fragi GC01. Here we studied the role of volatile sulfur compounds (VSCs) in the biosynthesis of CdS QDs by P. fragi GC01. The biosynthesis of nanoparticles was evaluated in the presence of sulfate, sulfite, thiosulfate, sulfide, cysteine and methionine as sole sulfur sources. Intracellular biosynthesis occurred with all sulfur sources tested. However, extracellular biosynthesis was observed only in cultures amended with cysteine (Cys) and methionine (Met). Extracellular nanoparticles were characterized by dynamic light scattering, absorption and emission spectra, energy dispersive X-ray, atomic force microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Purified QDs correspond to cubic nanocrystals of CdS with sizes between 2 and 16 nm. The analysis of VSCs revealed that P. fragi GC01 produced hydrogen sulfide (H 2 S), methanethiol (MeSH) and dimethyl sulfide (DMS) in the presence of sulfate, Met or Cys. Dimethyl disulfide (DMDS) was only detected in the presence of Met. Interestingly, MeSH was the main VSC produced in this condition. In addition, MeSH was the only VSC for which the concentration decreased in the presence of cadmium (Cd) of all the sulfur sources tested, suggesting that this gas interacts with Cd to form nanoparticles. The role of MeSH and DMS on Cds QDs biosynthesis was evaluated in two mutants of the Antarctic strain Pseudomonas deceptionensis M1 T : megL – (unable to produce MeSH from Met) and mddA – (unable to generate DMS from MeSH). No biosynthesis of QDs was observed in the megL – strain, confirming the importance of MeSH in QD biosynthesis. In addition, the production of QDs in the mddA – strain was not affected, indicating that DMS is not a substrate for the biosynthesis of nanoparticles. Here, we confirm a link between MeSH production and CdS QDs biosynthesis when Met is used as sole sulfur source. This work represents the first report that directly associates the production of MeSH with the bacterial synthesis of QDs, thus revealing the importance of different VSCs in the biological generation of metal sulfide nanostructures.

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Section: Discussionsupporting

confidence: 74%

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

et al. 2019

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“…Because of every wavelength under 350 nm, it can be used as an optical filter. Band gap energy is obtained by plotting Tauc's plot [45]. Using the Tauc's relation, the absorption co-efficient for direct band gap indicates α = A (hʋ-Eg) n /hʋ here, A is a constant α is absorption co efficient, Eg is band gap energy, hʋ implies incident photon energy n=1/2 to straight permitted transition.…”

Section: Optical Studiesmentioning

confidence: 99%

Phase transition in ZnS nanoparticles: electrical, thermal, structural, optical, morphological, antibacterial and photocatalytic properties

Rose¹,

Christy²,

Benitta³

et al. 2022

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Zinc Sulphide nanoparticles (ZnS-NPs) are synthesized by microwave assisted chemical precipitation method. The as-synthesized nanoparticles are identified by X ray diffraction and electrical studies to examine the structural transition. The HT-XRD at 1000 C (373 K) and 2000 C (473 K) of ZnS-NPs also confirms structural transition of cubic to hexagonal phase. Thermal properties of the ZnS sample is also studied using thermo gravimetricdifferential thermal analysis (TG-DTA). From D.C. electrical resistance, a discontinuity occurs in the temperature resistance curve of the ZnS-NPs due to phase transition around 450 K. The energy dispersed x-ray analysis and Raman spectra of the ZnS-NPs confirm the presence of zinc and sulphur. The optical studies of the prepared ZnS-NPs are confirmed by its UV-vis and PL spectra. The TEM image of cubic ZnS-NPs reveals the well distribution of spherical shaped particles with mean size of 12.52 nm with standard deviation of 9.326 nm. According to the photocatalytic results of ZnS-NPs for the degradation of methylene blue (MB) have the highest degradation efficiency of 93.24% under UV irradiation within 80 min. Antibacterial effects of ZnS-NPs nanoparticles against some pathogens, like gram-negative, gram-positive, E. coli (Escherichia coli), S. aureus (Staphylococcus aureus) bacteria.

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Crystallographic, Energy Gap, Photoluminescence and Photo-Catalytic Investigation of Cu Doped Cd0.9Zn0.1S Nanostructures by Co-precipitation Method

Prabu

Jesuraj

Muthukumaran³

2021

J Inorg Organomet Polym

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The controlled synthesis of Cd 0.9 Zn 0.1 S, Cd 0.89 Zn 0.1 Cu 0.01 S and Cd 0.87 Zn 0.1 Cu 0.03 S nanostructures by simple chemical co-precipitation technique was reported. The XRD investigation con rmed the basic CdS cubic structure on Zn-doped CdS and also Zn, Cu dual doped CdS with no secondary/impurity related phases. No modi cation in cubic structure was detected during the addition of Zn/Cu into CdS. The reduction of crystallite size from 63 Å to 40 Å and the changes in lattice parameter con rmed the incorporation of Cu into Cd 0.9 Zn 0.1 S and generation of Cu related defects. The shift of absorption edge along upper wavelength region and elevated absorption intensity by Cu doping can be accredited to the collective consequence of quantization and the generation of defect associated states. The enhanced optical absorbance and the reduced energy gap recommended that Cd 0.87 Zn 0.1 Cu 0.03 S nanostructure is useful to enhance the e ciency of opto-electronic devices. The presence of Cd-S / Zn-Cd-S /Zn/Cu-Cd-S chemical bonding were con rmed by Fourier transform infrared investigation. The elevated green emissions by Cu incorporation was explained by decrease of crystallite size and creation of more defects.Zn, Cu dual doped CdS nanostructures are recognized as the possible and also e cient photo-catalyst for the removal dyes like methylene blue. The enhanced photo-catalytic behaviour of Zn, Cu dual doped CdS is the collective consequences of high density electron-hole pairs creation, enhanced absorbance in the visible wavelength, surface area enhancement, reduced energy gap and the formation of novel defect associated states. The stability measurement signi ed that Cu doped Cd 0.9 Zn 0.1 S exhibits superior dye removal ability and better stability even after 6 repetitive runs with limited photo-corrosion.

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Synthesis and characterization of CdS nanoparticles prepared by precipitation in the presence of span 20 as surfactant

Cited by 13 publications

References 22 publications

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

Phase transition in ZnS nanoparticles: electrical, thermal, structural, optical, morphological, antibacterial and photocatalytic properties

Crystallographic, Energy Gap, Photoluminescence and Photo-Catalytic Investigation of Cu Doped Cd0.9Zn0.1S Nanostructures by Co-precipitation Method

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