Properties Of Zinc Sulfide Nanoparticles Research Articles

Effect of Cu2+ and Cr3+ doping on structural, morphological, optical and electrical properties of zinc sulfide nanoparticles for optoelectronic applications

Effect of Cu2+ and Cr3+ doping on structural, morphological, optical and electrical properties of zinc sulfide nanoparticles for optoelectronic applications

Impact of surfactant (EDTA) on the properties of zinc sulphide nanoparticles and their antibacterial activity

In the present study solvothermal route is chosen to synthesize uncapped and EDTA capped zinc sulphide (ZnS) nanoparticles. X-ray diffraction studies confirmed the zinc-blende crystal structure with crystallite size lying between 6 and 16 nm. Scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) show the prominent decrease in agglomeration of capped nanoparticles than that of uncapped nanoparticles while the elemental analysis confirmed the presence of Zinc and Sulphur. The optical band gap increased with decrease in particle size as calculated by UV-visible absorption spectroscopy. The photoluminescence spectroscopy (PL) shows that the blue-visible emission peaks are shifted to higher wavelength region for uncapped nanoparticles than that of EDTA capped nanoparticles. The presence of different organic and inorganic functional groups and encapsulation of EDTA in the prepared samples are confirmed by Fourier Transform Infrared Spectroscopy (FTIR). The synthesized nanoparticles are found to be good antibacterial agents of Escherichia coli and Staphylococcus aureus. The objective of the present work is to show that the EDTA capped nanoparticles are found more resistant towards the bacterial strains than that of uncapped nanoparticles which is the novelty of our work and the activity increases with increase in the concentration of nanoparticles. Thus, they may be used for biological and medicinal purposes such as an antiseptic, photo corrosion, antioxidant, antifungal etc.

Green synthesis of zinc sulfide nanoparticles-organic heterocyclic polyol system as eco-friendly anti corrosion and anti-bacterial corrosion inhibitor for steel in acidic environment

ABSTRACT Green synthesis, characterization and evaluation of nanoscale zinc sulfide (ZnS) by precipitation chemical method. The zinc sulfide nanoparticles were prepared by chemical precipitation method using heterocyclic polyvinyl alcohol, PVA as a sensitizer. The prepared heterocyclic compounds system ZnS nanoparticles, PVA, EG were used as anti-bacterial corrosion towards sulfate-reducing bacteria (SRB) and anti-corrosion for carbon steel substrate in sulfuric acid and hydrogen sulfide bacterial corrosive environment using chemical, analytical, and electrochemical techniques. Effect of adding PVA, and ethylene glycol, EG to ZnS nanoparticles were studied. Effect of ZnS nanoparticles concentrations and the reaction temperature on the corrosion inhibition efficiency were studied. The inhibition due to adsorption of nanoparticles on steel surface, the adsorption agree well with Langmuir isotherm with suggested chemical adsorption mechanism. Potentiodynamic polarization (PD) and Electrochemical impedance spectroscopy (EIS) data explain that the used inhibitor is mixed-type and improves polarization resistance and inhibition performance by adhering to metal/electrolyte interface. The cathodic and anodic reactions are delayed when inhibitor molecules are added to an aggressive medium, which results in a negative shift in the open circuit potential. Addition of both PVA, and EG as organic polyol materials enhance the adsorption and inhibition properties of zinc sulfide nanoparticles on steel surface.

Doping effect of Ni2+ ion on structural, morphological and optical properties of Zinc sulfide nanoparticles synthesized by microwave assisted method

The synthesis of Ni2+ ion doped ZnS nanoparticles is processed via microwave assisted solvothermal method and its structure, morphology and optical properties are explored for various applications. The as synthesized samples were characterized via XRD, SEM, EDX, HRTEM, FTIR, PL and UV Visible Spectroscopy. The structural analysis of pure and Ni2+ ion doped ZnS nanoparticles confirms the cubic structure as well as crystalinity of the sample. The average crystallite size estimated via Scherrer equation was found to be in the range of 4−8 nm for doped and undoped ZnS nanoparticles. The doping of Ni2+ ion is confirmed via EDX spectra and mapping. TEM results are found to be in accordance with that of XRD report. The involvement of various functional groups are detected by FTIR spectra. The bandgap estimated via Tauc plot reveals the dependency of bandgap on the doping concentration of Ni2+ ion. The optical energy bandgap determined using UV–vis spectra is 3.70, 3.74, 3.77, 3.82 and 3.98 eV for pure and various concentration of Ni2+ ion doped ZnS.

A novel green synthesis approach for improved photocatalytic activity and antibacterial properties of zinc sulfide nanoparticles using plant extract of Acalypha indica and Tridax procumbens

In this present work, improved photocatalytic activity and antibacterial properties of zinc sulfide (ZnS) nanoparticles using plant extract of Acalypha indica (A:ZnS) and Tridax procumbens (T:ZnS) via novel green synthesis route had been reported. X-ray diffraction (XRD), transmission electron microscopy (TEM), and Energy dispersive X-ray spectroscopy (EDX) were used to investigate the crystal structure, surface morphology, and elemental composition analysis, respectively. The optical properties and functional group analysis of the samples were done using UV–visible, photoluminescence, and Fourier transform infrared spectroscopy (FTIR). The influence of Acalypha indica (A:ZnS) and Tridax procumbens (T:ZnS) plant extract concentration on the structural, surface morphology, optical, antibacterial, and photocatalytic activity has been systematically investigated. XRD results are suggested that ZnS hexagonal wurtzite crystal structure formed during biosynthesis process. TEM and SAED images show the hexagonal- and spherical-shaped structure in morphology with average diameter around 5–20 nm which is good agreement with the grain size calculated from XRD. Optical properties were found to have considerable red shift in the absorption edge and decreasing band gap was observed for A:ZnS/T:ZnS (2.96 eV) when compared to pure ZnS (3.36 eV). The antibacterial properties of ZnS/A:ZnS/T:ZnS nanoparticles were investigated using in vitro disk diffusion method against human pathogenic microorganisms. The inhibition zone of biosynthesized ZnS nanoparticles increased by increasing plant extracts concentration. This result conformed that A:ZnS/T:ZnS nanoparticles have more potential as antibiotic when compared with pure ZnS. Besides, Biosynthesized T:ZnS (40 ml) nanoparticles showed high surface area (131.84 m2/g) and larger pore size (12.15 nm) than pure ZnS sample; this high surface area may offer more active sites to enhance photocatalytic ability. The dye degradation properties of methylene blue dye (MBD) were investigated using the ZnS/A:ZnS/T:ZnS nanoparticles under visible light irradiation. The results show that T:ZnS (40 ml) has excellent photocatalytic performance towards MBD such as high degradation efficiency (98%) and more cyclic stability than other ZnS samples. The role of plant extract on dye degradation properties was discussed based on the possible inhibition of photogenerated electron–hole pair recombination during dye degradation under visible light irradiation.

Effect of the Number Shots of Laser on Structural Transformations and Optical Properties of ZnS Nanoparticles Thin Films

Effects of the number of shots of laser and annealing temperature on the structural, morphological, and optical properties of zinc sulfide nanoparticles (ZnS NPs) thin films, prepared by pulsed laser deposition technique (PLD), were investigated. XRD results show that ZnS NPs exhibit a hexagonal phase at 623k. Transformation in the shape of nanoparticles to nanoflowers and nanorods appeared with increasing number of shots of laser at the same annealing temperature (623K) was observed from scanning electron microscopy (SEM) images. The optical properties were studied from all transmittance data. The experimental results show that the as-deposited ZnS NPs film exhibit a cubic structure and the crystallinity increased in the annealed films. It is also found that the grain size of the as grown samples at 300K, rises linearly from 9 to 11 nm with increasing the number of shots from 1000 to 3000 and rapidly from 10 to 18 nm after annealing at 623K. Additionally, the increase of the number of shots from 1000 to 3000 leads to a decrease in the energy gap values and increases their values after heat treatment keeping their behavior decreasing as the number of shots of laser increases. Also, photoluminescence (PL) measurements explained quenching its value after annealing temperature.

Antimicrobial Activity and Photocatalytic Degradation Properties of Zinc Sulfide Nanoparticles Synthesized by Using Plant Extracts

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.

The influence of Triton X-100 surfactant on the morphology and properties of zinc sulfide nanoparticles for applications in azo dyes degradation

Herein we report the synthesis, by two different routes, of ZnS nanoparticles capped with Triton X-100 (TX), which were characterized by X-ray diffraction, transmission electron microscopy, high resolution electron microscopy, selected area electron diffraction, energy dispersive X-ray spectroscopy, FTIR spectroscopy, UV–visible spectroscopy, photoluminescence spectroscopy, and surface area measurements. The TX-capped ZnS nanopowders have a very good photocatalytic activity and high specific surface area, depending on the synthesis route; e.g. an azo dye solution is almost complete photobleached in only 60 min (a photocatalytic activity of 97.79%) using TX-capped ZnS nanopowder, with specific surface area of 191 m2/g, and further a photocatalytic activity of 99.75% was achieved in 120 min. Based on the photocatalytic results, the ZnS nanopowders can be considered suitable catalysts for a green, very efficient and quick strategy for removing of organic pollutants from wastewaters.

Structural and optical properties of zinc sulphide nanoparticles synthesized via solid state reaction method

Pure Zinc sulfide nanoparticles were synthesized by an inexpensive Solid state reaction method using zinc acetate and thiourea at different temperatures (250–450 °C). The structural, functional, optical and morphological properties were characterized by using X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, UV–Vis spectroscopy, Photoluminescence (PL) spectroscopy and Scanning electron microscopy (SEM) with Energy dispersive X-ray analysis. XRD patterns confirmed the crystalline nature and cubic structure of the prepared products. Crystallite size, microstrain and dislocation density were also evaluated from the XRD data. The functional groups present in the samples were investigated by FTIR study. A blue shift in the absorption edges was noticed in the UV–Vis spectra. The PL spectra showed three emission peaks corresponding to both UV and visible emissions. SEM revealed the abundance of spherical shaped particles and the elements Zn and S alone are identified from EDS.

Zeta Potential, Size, and Semiconductor Properties of Zinc Sulfide Nanoparticles in a Stable Aqueous Colloid Solution

A stable aqueous colloid solution of zinc sulfide (ZnS) nanoparticles was obtained by chemical condensation using ethylenediaminetetraacetic acid disodium salt. The mechanism of prolonged aggregative stability of solution at pH 7–8 with ~7-nm nanoparticles was determined as a result of the zeta potential measurements by dynamic light scattering. The blue and red shifts of the fundamental absorption edge of zinc sulfide semiconductor nanoparticles associated with the small size of nanoparticles and the defective state of their surface were found by optical spectrophotometry.

Cytotoxic effect of ZnS nanoparticles on primary mouse retinal pigment epithelial cells

The multiple properties of zinc sulphide nanoparticles (ZnS-NPs) are attracting great attention in the field of chemical and biological research. ZnS-NPs also find their application in biosensor and photocatalysis. Zinc is an important metal ion in retina and its deficiency leads to age-related macular degeneration. As of now, not much research is available on bio-interaction of ZnS as nanoform with retinal pigment epithelial (RPE) cells. RPE cells in the retina help in maintaining normal photoreceptor function and vision. To begin with, ZnS-NPs were synthesized and characterized using UV-visible spectra, X-ray diffraction, Fourier transform infrared spectrum, transmission electron microscopy and dynamic light scattering. Followed by the confirmation of nanoparticles, our study extended to investigate the impact of ZnS-NPs in primary mouse RPE (MRPE) cells at different concentrations. ZnS-NPs showed dose-dependent cytotoxicity in MRPE cells and no changes were observed in cells’ tight intactness at minimal concentration. In addition, exposure to ZnS-NPs increased cellular permeability in dose- and time-dependent manner in MRPE cells. The findings from DCFH-DA analysis revealed that ZnS-NPs-treated cells had elevated level of reactive oxygen species and partial activation of cell apoptosis was identified after exposure to ZnS-NPs at higher concentration. Furthermore, pre-treatment of the primary MRPE cells with ZnS-NPs led to phosphorylation of Akt (Ser 473), which indicates the crucial role of ZnS-NPs in regulating cell survival at minimal concentration. Altogether, this study enumerates requisite dose of using ZnS-NPs to maintain healthy RPE cells and contributes to future studies in development of therapeutic drug and drug carrier for ocular-related disorders.

Structural and Optical Properties of Zinc Sulphide Nanoparticles and Its Potential Application

Structural and Optical Properties of Zinc Sulphide Nanoparticles and Its Potential Application

Synthesis and photoluminescence properties of zinc sulfide nanoparticles doped with copper using effective surfactants

Zinc sulfide (ZnS), various concentrations of Cu2+ (0.25%–1.25%)-doped ZnS and ZnS:Cu2+ nanoparticles capped with various surfactants have been successfully synthesized by a chemical precipitation method in ambient air at 80˚C. The synthesized particles were characterized by UV–visible absorption (UV–vis), X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared (FT-IR) and photoluminescence (PL) spectroscopy. The absorption peaks of the synthesized nanoparticles were noticeably blue-shifted from the bulk material. The XRD analysis confirmed the formation of a cubic phase for all samples. The average size of the particles ranged from 3.2 to 5.3nm. The TEM analysis showed that the particles were highly monodispersed and spherical in shape. Particles with increased Cu2+ concentrations had a red shift in their PL emission spectra. Enhanced PL emissions were observed for surfactant-capped particles. The experimental results indicate that, as expected, the PL spectrum confirms the presence of Cu2+ ions in the ZnS nanoparticles.

Mechanochemical synthesis, characterization and optical properties of zinc sulphide nanoparticles

Nanosized zinc sulphide (ZnS) was synthesized by the mechanochemical route using zinc acetate and sodium sulphide as source materials in a high energy planetary ball mill (Retsch PM 400/2) for 30–90 min at rotation speed of 300 rpm and vial rotation speed of 600 rpm with ball to powder ratio 5:1. The milled powder was washed with methanol to remove impurity and heat treated at 100–400 °C. ZnS nanoparticles then characterized by using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), UV–Vis–NIR spectrophotometer and fluorescence spectrophotometer. The crystallite size of the synthesized ZnS nanoparticles is found to be in 3–9 nm range. FESEM morphology shows the formation of nanostructure of ZnS samples. The value of optical band gap has been found to be in the range 3.87–4.66 eV. Room temperature photoluminescence spectrum of ZnS samples exhibit a blue emission peaked at 466 nm under UV excitation.

Structure and Photoluminescence Properties of Zinc Sulfide Nanoparticles Prepared in a Clay Suspension

Structure and Photoluminescence Properties of Zinc Sulfide Nanoparticles Prepared in a Clay Suspension

Structure and Photoluminescence Properties of Zinc Sulfide Nanoparticles Prepared in a Clay Suspension

Zinc sulfide nanoparticles (ZnS NPs) were prepared under several precursor concentration conditions in Laponite XLG suspension as clay stabilizer to prevent the aggregation of ZnS NPs and to enhance their photoluminescence (PL). We measured their properties such as PL, UV−vis absorption, X-ray diffraction, and the particle image by transmission electron microscopy. The results of the measurements showed that ZnS NPs prepared in the presence of the clay particles were monocrystalline particles, since the dispersed Laponite XLG clay particles had a stabilizing effect on ZnS NPs. ZnS NPs prepared without clay were the aggregated particles of multicrystalline particle. When the precursor concentration of ZnS NPs increased, the particle diameter of ZnS NPs increased. These results agreed with von Weimarn’s law. PL originating from the defect level on the ZnS NPs surface was observed. The PL intensity was enhanced due to the increase of the particle surface area, as the clay particles existed or the particle di...

Effects of Time Elapsed after Preparation on Photoluminescence Properties of Zinc Sulfide Nanoparticles Doped with Manganese

Manganese-doped zinc sulfide (ZnS:Mn) nanoparticles were synthesized by mixing aqueous solutions of zinc nitrate and manganese nitrate with sodium sulfide. The photoluminescence (PL) of ZnS:Mn nanoparticles (NPs) dispersed in the aqueous solution was observed at 590 nm using extinction light 320 nm in wavelength. When the S and Zn ion concentrations were equal (equimolar condition), the Mn content in NPs increased with the molar ratio Mn/Zn in the feed solution. PL intensity and PL quantum efficiency were proportional to the Mn content in NPs. The particle size of ZnS:Mn increased with the time elapsed after preparation, although the Mn content was constant. NP absorbance at 320 nm increased with elapsed time due to increasing NP size so that PL intensity increased because of increasing absorbed light energy. However, the quantum efficiency remained almost constant. When the S ion concentration exceeded the Zn ion concentration (excess S ion condition), the particle size and absorbance at 320 nm increased with elapsed time, exhibiting trends similar to those observed in NPs prepared under the equimolar condition. On the other hand, the quantum efficiency under an excess S ion condition increased with the elapsed time.

Properties of zinc sulphide nanoparticles stabilized in silica

Zinc sulphide nanoparticles have been synthesized in silica matrix using sol-gel method. It is observed that silica could be loaded with zinc sulphide over a very wide range of concentration without changing the nanoparticle size. A strongly luminescent zinc sulphide-silica composite, thermally stable even upto ∼700°C was thus obtained. Several techniques like UV absorption, photoluminescence, x-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetry and photoelectron spectroscopy have been performed to analyse the ZnS-silica composites.