Size Of ZnS Nanoparticles Research Articles

Analytical Study of Zinc Sulphide Electrode Prepared from Nano material

Zinc Sulphide nanoparticles (NPs) has been prepared from raw material by microwave method. ZnS NPs were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), The size of ZnS NPs were about (3.15nm) calculated from the Scherer formula from the most intense XRD peak, The calculated product for ZnS was about 94.4%.Zn2+-selective electrode based on poly vinyl chloride (PVC) was prepared by using ZnS Nanoparticles (NPs) powders and di-butyl phthalate, and were compared The analytical specifications of ZnS NPs and ZnS Microparticles (Non- NPs ) electrode. ZnS NPs electrode and ZnS Non- NPs electrode give linear range upon (10-5-10-2)M and (10-4-10-2)M, Nernstain slope of (30.35 mV/decade) and (30.84 mV/decade), correlation coefficient of (0.9999) and (0.9995), detection limit of (1.733x10-7)M and (2.486x10-6)M, quantitative limit of (5.77x10-7)M and (7.07x10-6)M, the response time of (9-39) second and (13-36) second, respectively. The lifetime for each electrode was 15 days. The optimum conditions for each electrode were (5-7), (20-30 ̊C) and (10-4) M for pH, temperature and concentration of filling solution respectively. The selectivity of electrodes were measured using mixed solutions method, the results showed that the selectivity coefficient values for all interferences ions are less than one.

Synthesis, Characterization of Nano Zinc Sulphide and Evaluation of DNA Binding Interactions

In recent years Bio-Nanotechnology is a new multidisciplinary field of research and development that has offered wide spectrum of potential applications in the medical field. Several hyperproliferative diseases such as cancer are treated by inhibiting DNA synthesis. For the innovative design and implementation of DNA applications in biological systems, it is extremely important to understand how DNA interacts with nanoparticles or small molecules. The ZnS NPs have been synthesized by solvothermal approach by refluxing an aqueous solution of zinc nitrate and Thiourea in presence of EDTA as chelating agent. The interactions of zinc sulfide nanoparticles with calf thymus DNA were investigated and the structural characterization of ZnS nanoparticles was performed using XRD, FTIR, FE-SEM. The average grain size of ZnS nanoparticles were determined from XRD was found to be nearly 3 nm. Binding interaction studies of nanoparticles with CT DNA were carried out using UV–Visible and fluorescence spectroscopy. The binding efficiency was evaluated and the binding constant (Kb) of ZnS was observed to be 1.6x 105M-1 indicating ZnS NPs binds to DNA. The fluorescence quenching investigation revealed that the fluorescence of ZnS Nps was quenched by CT DNA via a static quenching mechanism. The binding studies research on Zns NPs and CT DNA interactions provide new horizons in biomedical applications which may be beneficial for drug designing.

Highly improved nonlinear optical responses of reduced graphene oxide via the decoration of Ni doped ZnS nanoparticles

The application of graphene and graphene-like materials in photonics has attracted extensive attention in recent years. However, their nonlinear optical (NLO) properties need to be improved urgently. Herein, we demonstrate a method to improve the NLO properties of reduced graphene oxide (RGO) via the decoration of Ni transition element doped ZnS nanoparticles on RGO sheet. The samples of Ni doped ZnS decorated RGO (Ni-ZnS/RGO) composites with different Ni doping concentrations and ZnS particles sizes were synthesized via a facile solvothermal method. The NLO responses of Ni-ZnS/RGO composites were investigated via the Z-scan technique under a picosecond laser at 1064 nm. The results indicated that Ni-ZnS/RGO composites exhibited saturation absorption and positive nonlinear refraction properties, and they could be adjusted by controlling the doping concentration of Ni and the size of ZnS nanoparticles. The maximum saturation absorption coefficient, nonlinear susceptibility and nonlinear refractive index of Ni-ZnS/RGO among all the samples were obtained to be − 2.5 × 10−10 mW−1, 3.2 × 10−13cm2/W and 14.1 × 10−14cm2/W, which were 25, 18 and 23 times of those of RGO, and 3.6, 11.7 and 4.2 times of those of ZnS doped with 2.5%Ni, respectively. They were also much greater than those of the direct sum of the two independent units, RGO and Ni-doped ZnS. These highly improved NLO responses of Ni-ZnS/RGO composites were ascribed to the inhibition of the direct electron-hole recombination due to the introduction of Ni doped impurity energy levels within the band gap of ZnS, as well as the charge transfer and synergism between ZnS and RGO. The results of this investigation may promote the development and applications of Ni-ZnS/RGO materials in photonic devices.

Synthesis and Characterization of (Ag2S)x(ZnS) Heteronanostructures

(Ag2S)x(ZnS) heteronanostructures were synthesized by two-stage chemical codeposition of silver and zinc sulfides using aqueous solutions of zinc nitrate, silver nitrate, sodium sulfide, trisodium citrate and Trilon B. Prepared heteronanostructures were characterized for phase composition and nanoparticles size using X-ray diffraction and the high-resolution transmission electron microscopy. The size of Ag2S nanoparticles in the obtained heteronanostructures depends on the ratios of reagent concentrations and ranges from 9 to 30 nm, the size of ZnS nanoparticles is equal to 4-5 nm.

Synthesis and optical properties of nanostructured ZnS and heteronanostructures based on zinc and silver sulfides

Abstract ZnS nanopowders have been synthesized by chemical deposition from aqueous solutions of zinc nitrate and sodium sulfide in the presence of sodium citrate or Trilon B. Ag2S/ZnS heteronanostructures have been prepared by co-deposition of zinc and silver sulfides. The size of nanoparticles in the deposited powders has been estimated by X-ray diffraction and transmission electron microscopy. A change in the ratio between the concentrations of reagents in the reaction mixtures made it possible to obtain ZnS nanopowders with an average particle size of 2–10 nm. The size of the nanoparticles in the prepared heteronanostructures is 8–10 nm. The diffuse reflection spectra have been measured and the corresponding absorption spectra of nanostructured ZnS and Ag2S/ZnS heteronanostructures have been analyzed using Tauc plots. The optical band gap Eg of the studied sulfide nanostructures has been estimated. A blue shift of the optical absorption edge and an increase in the Eg values from 3.59 to 3.72 eV are observed with a decrease in the size of ZnS nanoparticles. An increase in the Ag2S content in Ag2S/ZnS heteronanostructures leads to a decrease in the optical band gap. Pulsed cathodoluminescence of nanostructured ZnS and Ag2S/ZnS heteronanostructures have been investigated. It is found that the maxima of the luminescence spectra of nanostructured zinc sulfide are located at about 450 nm. Prepared samples of nanostructured ZnS possess a very short decay time and thanks to this property the prepared ZnS nanostructures can be used as a material for scintillation detectors.

Оптические свойства нанопорошков сульфида цинка и гетеронаноструктур ZnS/Ag-=SUB=-2-=/SUB=-S

ZnS nanopowders and ZnS/Ag2S heteronanostructures have been synthesized by chemical deposition from aqueous solutions. A change in the ratio between the concentrations of reagents in the reaction mixtures made it possible to obtain ZnS nanopowders with an average particle size of 2 to 10 nm. The size of Ag2S nanoparticles in the prepared heteronanostructures is 9-30 nm, the thickness of ZnS surface layer is 4-5 nm. The diffuse reflection spectra of nanostructured ZnS and ZnS/Ag2S heteronanostructures have been measured. By the analysis of measured spectra, the width of band gap Eg in studied sulfide nanostructures is estimated. The optical band gap Eg of the studied sulfide nanostructures has been estimated. An increase in the Eg values from 3.17 to 3.36 eV is observed with a decrease in the size of ZnS nanoparticles from 10 to 2 nm. An increase in the Ag2S content in ZnS/Ag2S heteronanostructures leads to a decrease in the optical band gap and decreasing the luminescence intensity.

Effect of annealed ZnS nanoparticles on the structural and optical properties of PVA polymer nanocomposite

PVA/ZnS nano-composites were prepared by both thermolysis and casting procedures. The influence of annealing temperature of ZnS nano filler on the structure properties of composite films was studied by x-ray diffraction and Fourier transform infrared (FTIR) techniques. X-ray analysis revealed that ZnS can be obtained by changing the annealing temperature up to 500 °C, above this temperature ZnS converted into ZnO. Moreover, the crystallite size of ZnS increased from 4 to 10 nm as the annealing temperature rose from 300 to 500 °C. The effect of crystallite size of nano filler on extinction coefficient, refractive index, band gap, dielectric constant, single-oscillator and the dispersion energies was studied in details using UV–vis. spectrophotometer technique. The photoluminescence technique (PL) showed that, PVA/annealed ZnS nano-composite films exhibited five sub-emissions spectra for ZnS annealed at 300 °C and 400 °C while the sample contained ZnS annealed at 500 °C displayed two sub-emissions. PL intensity enhanced with increasing the crystallite size of ZnS nano particles.

Controlled Growth from ZnS Nanoparticles to ZnS–CdS Nanoparticle Hybrids with Enhanced Photoactivity

Chalcogenide nanostructures and nanocomposites have been the focus of semiconductor nanomaterial research due to their remarkable optoelectronic and photocatalytic properties and potential application in photodegrading enviromental pollutions. However, currently available synthesizing methods tend to be costly and inefficient. In this paper, we propose a facile two‐step solution‐phase method to synthesize well‐defined monodisperse ZnS–CdS nanocomposites. The morphology and size of ZnS nanoparticles can be easily controlled by adjusting the amount of the source of sulfur. After surface modification with tiny CdS nanoparticles through natural electrostatic attraction, uniform ZnS–CdS nanocomposites are obtained, which has been further confirmed by transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). The photocatalytic activities of various ZnS samples and ZnS–CdS nanocomposites have been investigated by degrading Rhodamine B under UV‐light. Compared with pure ZnS nanoparticles and ZnS powders, the as‐obtained ZnS–CdS nanocomposites exhibit excellent photocatalytic performances due to the effective charge separation and increased specific surface area by the attachment of CdS. Moreover, resulting from the effective passivation of surface electronic states, the photoluminescence intensity of the ZnS–CdS nanocomposites is also significantly improved relative to plain ZnS.

Effect of pH on Size of ZnS Nanoparticles and Its Application for Dye Degradation

This paper presents the results from a study related to the effect of solution pH on particle size and photocatalytic properties of ZnS nanoparticles (NPs). ZnS NPs capped with 2-Mercaptoethanol (2-ME) have been synthesized via chemical precipitation route at different pH values, i.e., 8, 10, and 12. Effect of solution pH on particle size of NPs has been studied by the Dynamic Light Scattering (DLS) technique. A comparison of the results obtained from the DLS technique for ZnS NPs synthesized at different pH values showed narrower particle size distribution as we go from higher pH value, i.e., 12, to lower pH value, i.e., 8. Fourier Transform Infrared Spectroscopy (FTIR) has been carried out to study the presence of hydroxyl groups and 2-ME on the surface of NPs. Comparative photocatalytic study of these NPs has also been carried out using Ponceau S dye.

One pot synthesis and characterization of ZnS nanoparticles in the mixed surfactant system

The hydrophilic monodisperse ZnS nanoparticles were synthesized in the mixed surfactant system (oleic acid OLA and sodium dodecyl sulfate SDS). X-ray powder diffraction (XRD), UV–Vis absorption spectra, transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy were used to characterize ZnS nanoparticles. The sizes of ZnS nanoparticles were determined to be about 5 nm using XRD. The photoluminescence properties indicated that ZnS nanoparticles exhibited a strong luminescent at 450 nm. It was found that PL and absorption intensity of ZnS nanoparticles increased with the increase of OLA/SDS molar ratio, and showed a maximum when ratio was 1:2. If SDS concentration continued to increase, the PL intensity would decrease. In addition, the results of the contact angle demonstrated that the hydrophilicity of ZnS nanoparticles have been improved greatly.

Spectroscopy of Nickel-Doped Zinc Sulfide Nanoparticles

ABSTRACT In the present study, Zn1−xNixS (x = 0.0–0.8 mol%) nanoparticles were prepared through the chemical route and the synthesis involved the mixing and drying of zinc acetate and sodium sulphide in an appropriate ratio with the addition of Ni2+ at a proper concentration. The structural and spectroscopic studies are investigated by X-ray diffraction (XRD), absorption spectra, emission and excitation spectra, and Raman spectra. Compared with that of the pristine materials, the absorption band-edge demonstrates an apparently blue shift, which is attributed to the quantum size effect. The average particle size of ZnS nanoparticles is in the range of 2–4 nm deduced from the XRD line broadening. Excited at about 330 nm, a blue emission band at 425 nm can be observed, which corresponds to Ni2+ luminescent center; this result is consistent with the postulation that Ni2+ replaced the Zn2+ ions in the lattice of ZnS nanocrystals. Excitation spectra also confirm the above postulation. The effect of different concentrations of nickel is also studied by Raman spectra.

Influence of Polyvinyl Alcohol and Alpha-Methacrylic Acid as Capping Agents on Particle Size of ZnS Nanoparticles

ZnS nanoparticles were synthesized successfully by wet chemical route using two capping agents, polyvinyl alcohol (PVA) and alpha-methacrylic acid (MA) to control particle growth. Optical property and the morphology of the synthesized ZnS nanoparticles revealed the influence of the capping agents in the formation of nanosize ZnS semiconductor. Particle sizes estimated from X-Ray Diffraction (XRD) analysis are 3.75 nm and 2.60 nm for ZnS/PVA and ZnS/MA respectively. The estimated energy band gap of the capped ZnS nanoparticles showed blue shift of 0.60 eV and 1.00 eV for ZnS/PVA and ZnS/MA respectively. The vibrational modes associated with OH-stretching and –COOH from the Fourier transform infrared spectroscopy (FTIR) measurements confirm the presence of the capping agents.

Effect of Cationic Surfactant Head Groups on Synthesis, Growth and Agglomeration Behavior of ZnS Nanoparticles

Colloidal nanodispersions of ZnS have been prepared using aqueous micellar solution of two cationic surfactants of trimethylammonium/pyridinium series with different head groups i.e., cetyltrimethylammonium chloride (CTAC) and cetyltrimethylpyridinium chloride (CPyC). The role of these surfactants in controlling size, agglomeration behavior and photophysical properties of ZnS nanoparticles has been discussed. UV–visible spectroscopy has been carried out for determination of optical band gap and size of ZnS nanoparticles. Transmission electron microscopy and dynamic light scattering were used to measure sizes and size distribution of ZnS nanoparticles. Powder X-ray analysis (Powder XRD) reveals the cubic structure of nanocrystallite in powdered sample. The photoluminescence emission band exhibits red shift for ZnS nanoparticles in CTAC compared to those in CPyC. The aggregation behavior in two surfactants has been compared using turbidity measurements after redispersing the nanoparticles in water. In situ evolution and growth of ZnS nanoparticles in two different surfactants have been compared through time-dependent absorption behavior and UV irradiation studies. Electrical conductivity measurements reveal that CPyC micelles better stabilize the nanoparticles than that of CTAC.

Microwave-assisted synthesis and luminescent properties of pure and doped ZnS nanoparticles

Pure and doped ZnS nanoparticles have been successfully synthesized via microwave irradiation. X-ray diffraction (XRD) analysis shows that the crystal size of the pure ZnS particles is about 6.5 nm. The ultraviolet–visible (UV–vis) absorption spectra of the samples indicate that the irradiation time shows no significant influence on the size of ZnS nanoparticles. It is also found that the luminescent properties of ZnS nanoparticles are greatly affected by either the microwave irradiation time or dopants of various metallic ions (Ag +, Cu 2+, Ce 3+ and Sn 4+). The intensity of photoluminescence (PL) emission reaches its maximum and then decreases with prolonging the microwave irradiation time. The luminescence intensity of ZnS nanoparticles doped with 0.2% cerium, which is stronger than that of other dopants, is about two times that of sample doped with 0.2% Ag + and 1.6 times that of pure ZnS nanoparticles. But when the amount of doped cerium reaches 0.4%, the emission efficiency is lower than that of pure ZnS. All peak emission wavelength is 450 nm, indicating that the luminescent centers of various metallic ions are not formed within the doped ZnS nanoparticles.

Spectro-Optical and Photochemical Properties of ZnS Nanoparticles

The spectro-optical properties of nanoparticles of ZnS have been studied and the structure of the long wavelength edge of the absorption bands of the semiconductor has been analyzed. The influence of the synthesis conditions on the size and optical properties of the nanoparticles of ZnS formed has been investigated. It has been established that oxidative photo-corrosion of zinc sulfide colloids is accompanied by a decrease in the average size of ZnS nanoparticles and an increase in the defectiveness of their surfaces.

Lubrication of the mixed system of Triton X-100/ n-C 10H 21OH/H 2O lamellar liquid crystal and ZnS nanoparticles

ZnS nanoparticles could be synthesized, when two kinds of Triton X-100/ n-C 10H 21OH/H 2O lamellar liquid crystal were mixed, in which Zn(CH 3COO) 2 and Na 2S were dissolved in the solvent layer, respectively. The size of ZnS nanoparticles was about 10 nm and limited by the thickness of the solvent layer of the lamellar liquid crystal. The lubrication properties of the mixed system of Triton X-100/ n-C 10H 21OH/H 2O lamellar liquid crystal and ZnS nanoparticles were determined. The results showed that the presence of ZnS nanoparticles could improve the anti-wear ability of the Triton X-100/ n-C 10H 21OH/H 2O lamellar liquid crystal and decrease its friction coefficient.