جستجوی مقالات مرتبط با کلیدواژه « Zinc sulfide » در نشریات گروه « شیمی »

Electrosynthesis of zinc sulfide nanoparticles doped with copper and chlorine has been investigated in this study. For the electrosynthesis of ZnS, a constant current pulse of 200 mA cm-2 was applied to zinc nitrate and sodium thiosulfate solution containing 1 M hydrochloric acid in an electrochemical cell. The thin film of zinc sulfide nanoparticles was placed on a graphite electrode. For doping Cl- and Cu+ on ZnS, the modified electrode was placed in copper sulfate solution containing 0.1 M potassium chlorate under a constant potential of -0.9 V for 3 minutes. By changing the concentration of potassium chlorate from 0.1 to 0.01 and 0.0001 M, the amount of doped Cl was variable, therefore; nanoparticles with different luminescence properties were achieved. Based on the X-ray diffraction pattern average crystallite size for nanocomposites is the same and about 34-64 nm. Using scanning electron microscopy imaging it was observed that synthesized nanocomposites have appropriate uniformity. Characterization was performed using XRD and FT-IR methods. The morphology and luminescence properties of these nanoparticles were studied using SEM and UV-Visible.

Zinc sulphide (ZnS) nanoparticles were synthesized by simple aqueous chemical reaction of zinc chloride and sodium sulphide in an aqueous solution. The main advantage of ZnS nanoparticles of diameter 29 nm was that the sample could be prepared by using of cheap precursors in a cost effective and eco-friendly manner.  Structural, morphological and chemical composition of the prepared  nanoparticles were investigated by X-Ray Diffraction(XRD),Scanning Electron Microscopy(SEM) with energy dispersion X-ray dispersive fluorescence spectroscopy (EDAX) and Fourier transform infrared (FTIR) spectroscopy. The antimicrobial effects of the zinc sulphide (ZnS) nanocrystals   and the anticarcinogenic agent imatinib were studied by spot inoculation technique and also by well diffusion technique against twelve pathogenic bacterial strains.  Nanoparticles of ZnS showed antimicrobial activity against both Gram positive and Gram negative strains except Shigella sonnei. The anticancer drug imatinib was inhibitory for only Gram positive organisms, Bacillus subtilis and Staphyloccus aureus. Synergism between imatinib and ZnS nanoparticles was distinctly observed in all the Gram positive strains.

Recently, different significant efforts have been made to fabricate an effectively modified electrode for replying to the growing requests for enhanced performance electrodes for electrochemical sensors. Herein, we introduced an organic material along with a composite of the zinc sulfide (ZnS) particles distributed in the substrate of carbon nanotubes (CNTs)/reduced graphene oxide (RGO) nanosheets by using an inexpensive, simple, and one-step fabrication method, as an effectively modified electrode for the determination of hydrazine as an analyte. This electrode represents a great electrochemical performance with a large linear range (0.01 μM-60.0 μM) and a proper limit of detection value (0.006 µM) for determination of hydrazine. Good recovery percentage values for the proposed sensor confirm its excellent ability to measure hydrazine.

In this work, PP+CdS/ZnS transparent hybrid polymer nanocomposites were synthesized and studied. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive (EDS), and UV-spectroscopy analysis. It was found that the bandgap of PP+1%CdS/ZnS; PP+3%CdS/ZnS, and PP+5%CdS/ZnS; PP+10%CdS/ZnS nanocomposites is 5.2 eV, 5.1 eV, 4.6 eV, respectively. SEM analysis showed that the ZnS and CdS nanoparticles are evenly distributed in the polymer matrix. Furthermore, the average size of nanoparticles in the PP+3%CdS/ZnS, PP+5%CdS/ZnS nanocomposite is 40-54 nm, 29-56 nm, respectively. Photoluminescence properties of hybrid PP+CdS/ZnS nanocomposites were also investigated. It was established that introduction of ZnS and CdS semiconductor nanoparticles into the polypropylene matrix leads to expanding the region of the spectral sensitivity of hybrid nanocomposites. The photosensitivity of PP+CdS/ZnS nanocomposite films was also investigated.

Hybrid polyaniline (PANI) based composites incorporating zinc sulfide (ZnS) nanoparticles (NPs) have been synthesized by using chemical oxidation technique. Schottky junction is constructed by depositing Polyaniline-zinc sulfide nanocomposite (PANI-ZnS NCs) on Au electrode. The results were compared with pure polyaniline. The I–V characteristics of the PANI-ZnS NCs heterojunction have shown the rectifying behavior. The detailed electrical measurement of the devices is performed under the different ratio of ZnS nanoparticles. An abnormal increase in the barrier height and decrease in the ideality factor with increasing 10 wt.% ZnS nanoparticles have been shown. The ideality factor (h) and barrier height (fb) of the heterojunction diode at room temperature are found to be 3.41 and 0.82 eV, respectively. These results showed the interaction between ZnS nanoparticles and PANI molecular chains.

Biological synthesis of zinc sulfide (ZnS) nanoparticles (NPs) was prepared by a simple co-precipitation method using methanol plant extracts of Tridax procumbens, Phyllanthusniruri, and Syzygium aromaticum. The as-prepared ZnS NPs was examined by several physiochemical techniques such as X-Ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-Visible spectroscopy, Fourier Transform infrared spectroscopy analysis (FTIR). The disk diffusion method was used to screen the antimicrobial activity of Pure and Plant extracts doped ZnS NPs against different gram positive, gram-negative bacteria and fungus culture. From this investigation synthesized ZnS NPs have a potential antimicrobial agent where showed a hot zone of inhibition (ZOI) at different concentration against all tested microorganisms. Biosynthesized ZnS NPs Photocatalytic degradation also evaluated for Methylene Blue Dye (MBD) and Methyl Orange Dye (MOD) degradation in aqueous solution under UV Light irradiation. Due to the smaller particles size, narrowing optical band gap and antimicrobial properties of synthesised ZnS NPs were improve the photocatalytic activity. Here we first time reported Syzygium aromaticum methanol extracts ZnS NPs exhibited excellent efficiency in Methylene Blue Dye (MBD) and Methyl Orange Dye (MOD) degradation with comparing other ZnS NPs.

In this research zinc sulfide (ZnS) nanoparticles and nanocomposites powders were prepared by chemical precipitation method using zinc acetate and various sulfur sources. The ZnS nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet-visible and fourier transform infra-red. The structure of nanoparticles was studied using X-ray diffraction pattern. The crystallite size of ZnS nanoparticles was calculated by Debye–Scherrer formula. Morphology of nano-crystals was observed and investigated using the scanning electron microscopy. The grain size of zinc sulfide nanoparticles were in suitable agreement with the crystalline size calculated by X-ray diffraction results. The optical properties of particles were studied with ultraviolet-visible absorption spectrum.

Electrosynthesis process has been used for preparation of zinc sulfide nanoparticles. Zinc sulfide nanoparticles in different size and shapes were electrodeposited by electrolysis of zinc plate as anode in sodium sulfide solution. Effects of several reaction variables, such as electrolysis voltage, sulfide ion concentration as reactant, stirring rate of electrolyte solution and temperature on particle size of prepared zinc sulfide were investigated. The significance of these parameters in tuning the size of zinc sulfide particles was quantitatively evaluated by analysis of variance (ANOVA). Also, optimum conditions for synthesis of zinc sulfide nanoparticles via electrosynthesis reaction were proposed. The structure and composition of prepared nanoparticles under optimum condition was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-Vis spectrophotometry techniques.

ZnS nanoparticles were synthesized via a simple surfactant free microwave route. In this synthesis, thioacetamide was used as sulfur source. The effects of different parameters such as type of zinc precursor, time and power of irradiation on the morphology and particle size of the products have been investigated. The nanostructures were characterized by means of X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and photoluminescence (PL) spectroscopy.