Doped Zinc Sulfide Nanoparticles Research Articles

Investigation of antibacterial and anticancer activities of copper, aluminum and nickel doped zinc sulfide nanoparticles

First time compared the different metals doped ZnS nanoparticles for antibacterial and liver cancer cell line. In this study, copper, aluminum and nickel doped ZnS NPs were synthesized via co-precipitation method. The XRD analysis was confirmed the presence of cubic crystal structure and crystallite size decreased from 6 to 3 nm with doping elements. While as SEM micro-grains were revealed slightly irregular and agglomerated morphology with the presence of dopant elements. The presence of different dopant elements such as Cu, Al and Ni in ZnS NPs was identified via EDX analysis. The FTIR results demonstrate various vibrational stretching and bending modes attached to the surface of ZnS nanomaterials. After that the well diffusion method was used to conduct in-vitro bioassays for evaluation of antibacterial and anticancer activities against E.coli and B.cereus, as well as HepG2 liver cancer cell line. Our findings unveil exceptional results with maximum inhibition zone of approximately 9 to 23 mm observed against E.coli and 12 to 27 mm against B.cereus, respectively. In addition, the significant reduction in cell viability was achieved against the HepG2 liver cancer cell line. These favorable results highlight the potential of Ni doped ZnS NPs for various biomedical applications. In future, the doped ZnS nanomaterials will be suitable for hyperthermia therapy and wound healing process.

Supremacy of l-glutamic acid on cerium doped ZnS nanoparticles for enhanced structural, morphological, optical properties and their applications in antimicrobial activity with efficient detection of latent fingerprints

The pure Zinc Sulphide (ZnS) and l-Glutamic acid capped Cerium doped Zinc Sulphide nanoparticles of different concentrations (0, 5, 10 & 15 mol %) was developed via a simple chemical co-precipitation strategy. l-Glutamic acid is the a minimum hazardous, non-essential amino acid group, and its capped properties are optimal for semiconducting nanoparticles that include ZnS. It also has a considerable effect on enhancing the structural, optical, and photoluminescent properties of Ce-doped ZnS nanoparticles. The produced nanoparticles were examined using X-ray diffraction (XRD), dynamic light scattering (DLS), Field emission scanning electron microscope (FESEM), Fourier transform Infrared spectroscopy (FT-IR), Photoluminescence (PL), and UV–Vis spectrometer. The XRD pattern revealed that all of the generated nanostructures have a cubic form with diffraction planes (111), (220), and (311), and the dimensions of the crystallite ranging from 1.685 nm to 2.144 nm. Its morphological view of nanoparticles was investigated utilizing FESEM. DLS testing demonstrated that the particle sizes were less than 30 nm. The functional groups of nanoparticles have been identified using FTIR investigations. PL investigations suggested the existence of substantial emission bands. The ultraviolet–visible scrutiny exhibited an optical band gap that spans 3.12–3.77 eV. The antimicrobial activity analysis was examined by the gram-positive and gram-negative bacteria in pure ZnS, l-glutamic acid-capped ZnS, and glutamic-capped 15 mol% Ce-doped ZnS, with their inhibitory zones also verified. Finally, it was ascertained that this type of nanoparticles was highly effective to reveal the fingerprints detection purposes in forensic applications.

Structural, Optical, and Bioactivity Properties of Silver-Doped Zinc Sulfide Nanoparticles Synthesized Using Plectranthus barbatus Leaf Extract

Aqueous leaf extract of Plectranthus barbatus was used, for the first time, for preparation of (2, 6 mol%) silver (Ag)-doped zinc sulfide nanoparticles (ZnS NPs), acting as a stabilizing and capping agent for NPs’ production. The obtained metal oxides were characterized by FTIR, UV-visible, XRD, and SEM methods. The results revealed that 0.02 and 0.06% Ag-doped ZnS had optical bandgaps of 3.20 and 3.03 eV. The XRD evinced the crystalline nature, while the FTIR confirmed the doped structure of the prepared oxides. The bioactivity investigations revealed that the biosynthesized Ag-doped ZnS NPs are more active against S. aureus than E. coli. Furthermore, the hemolytic tests indicated no potential harm to red blood cells if utilized at a low dose. Such enhanced optical and biological properties of Ag-doped ZnS may promote its prospective use in electronics and as an antibacterial agent.

Microwave-assisted synthesis and characterization of undoped and manganese doped zinc sulfide nanoparticles

Undoped and Mn-doped ZnS nanocrystals were produced by the microwave-assisted solvothermal method and characterized by X-ray diffraction, photoluminescence spectroscopy and scanning electron microscopy with energy-dispersive X-ray spectroscopy. All samples have the cubic zinc blende structure with the lattice parameter in the range of a = 5.406–5.411 Å, and the average size of crystallites is in the range of 6–9 nm. These nanoparticles agglomerate and form large grains with an average size of up to 180 nm. The photoluminescence of the undoped ZnS sample shows a broad emission band located at 530 nm, attributed to the defects at the surface of nanoparticles. In all Mn-doped samples, the emission peak at 598 nm was observed assigned to the characteristic forbidden transition between excited (4T1) and ground (6A1) levels of Mn2+. Synchrotron radiation X-ray absorption spectroscopy at the Zn and Mn K-edges combined with reverse Monte Carlo (RMC) simulations based on the evolutionary algorithm confirms that manganese ions substitute zinc ions. However, the difference in the ion sizes (R(Mn2+(IV)) = 0.66 Å and R(Zn2+(IV)) = 0.60 Å) is responsible for the larger interatomic distances Mn–S (2.40(2) Å) compared to Zn–S (2.33(2) Å). The static structural relaxations in ZnS:Mn nanoparticles are responsible for the large values of the mean-square displacements factors for Zn, S and Mn atoms obtained by RMC simulations.

Enhanced photodegradation of methylene blue from aqueous solution using Al-doped ZnS nanoparticles.

The post-transition semiconducting material of pure zinc sulfide (ZnS) and various concentrations of aluminum (Al) (2.5 wt%, 5.0% wt, 7.5 wt%, and 10% calcined at 200 °C) doped ZnS nanoparticles (NPs) were synthesized by sol-gel procedure. The crystal-like nature and phase structure of the product were examined by powder XRD analysis. This analysis shows that the pure ZnS nanoparticle does not form any secondary phase. The functional group of synthesized materials was analyzed by FTIR examination. The energy gap of the materials is calculated using electro-optic analysis and the Kubelka-Munk equation varies from 3.04 nm to 3.63 nm. The photoluminescence studies show the wide emissions (blue to green) for pure ZnS and Al-doped ZnS nanomaterials. The SEM images show the spherical structure and the agglomerated nanostructures. The presence of Zn, S, and Al are confirmed by EDAX spectra. From HR-TEM studies, pure ZnS and Al-doped ZnS nanoparticles exhibit uniform particle sizes. The rate of degradation was observed using MB dye. MB dye has maximum wavelength (λmax) of 664 nm. The dye degradation efficiency was improved as the dye ratio increased. Photocatalytic activities studies show the intensity of photocatalytic activities decreased for the maximum time interval. Doping of Al in ZnS boosts the photocatalytic activity. Hence, Al-doped ZnS appears to be better decomposing MB dye when exposed to visible light.

One-Pot Synthesis of Biocompatible Glycine Protected Chromium Doped ZnS Nanoparticles and their Optical Properties

Here in, we report the synthesis and characterization of Chromium doped Zinc Sulfide nanoparticles (ZnS NPs). Initially, ZnS NPs are synthesized by bio-compatible glycine cap using simple one-pot co-precipitate method, and further it is doped by Chromium. The structure and morphology of these ZnS NPs was confirmed by X-Ray Diffractometry (XRD) and Scanning Electron Microscope with Elementary Dispersive Spectrum (SEM with EDS) techniques. The optical characterization techniques reveal that the Chromium doping affected the absorption and photoluminescence properties of the NPs. Photoluminescence of these NPs shifts from 384 nm to 428 nm upon Chromium doping. By using Tauc plot we obtained the energy band gap of 4.7 eV and it reduces to 3.9 eV for Chromium dope. The resultant ZnS NPs have size of 2.17nm and 1.86nm (with Chromium doping), also it gives Cubic Zinc blend phase as proved by XRD. The instrumentation techniques SEM with EDS, XRD, FTIR confirms that high purity Chromium doped ZnS NPs can be obtained by the proposed simple, low cost and highly effective method.

Structural, optical and antimicrobial activity of Ferric doped zinc sulphide (ZnS) nanoparticles

The current study focuses on the preparation of pure and Ferric doped zinc sulphide (ZnS) using a wet chemical process. The formation of cubic ZnS was verified by X-ray diffraction (XRD) analysis of all prepared samples. The average crystallite particle size of pure and Fe (3%) and Fe (5%) doped ZnS is 33.95 nm, 23.50 nm, and 15.18 nm, respectively. With increasing Fe ion doping concentration, the optical band gap of doped ZnS nanoparticles decreases. Fourier transform infrared spectra confirmed the existence of chemical bonding. The antimicrobial tests were tested against standard bacterial strains.

Synthesis, characterization and applications of Gadolinium doped ZnS nanoparticles as photocatalysts for the degradation of dyes (Malachite Green and Rhodamine B) and as antioxidants

The paper reports the synthesis and characterization of PVP capped doped Zinc sulphide nanoparticles using Gadolinium as a doped metal by bottom up chemical co-precipitation method. The spectroscopic techniques used for the characterization of nanoparticles are Fourier Transform infra-red spectroscopy, X-ray diffraction, energy dispersive X-ray fluorescence spectroscopy and High Resolution Transmission electron microscopy. Optical Studies are done with UV-Visible absorption spectroscopy to determine the band gap energy of nanoparticles. Photocatalytic degradation of Malachite Green and Rhodamine B dyes in aqueous medium are studied in UV and sunlight irradiation with synthesized nanoparticles as catalysts. The synthesized nanoparticles are also evaluated as antioxidants using DPPH assay method. Statistical analysis is done to find the extent of linear fitting of scavenging efficiency with concentration of synthesized compounds.

Investigating the luminescent property of transition metal doped ZnS nanoparticles synthesised by co-precipitation method

The group II-IV nanoparticles have excellent semiconducting properties having a possibility of tuning it by changing the size, shape and precursors. This makes them an ideal candidate for their applications in the field of science and technology. Amongst several semiconductor nanoparticles, zinc sulphide (ZnS) nanoparticles are promising material because of chemical stability, low toxicity and better optical properties. Introducing transition metal impurities in ZnS nanoparticles further improves the physical properties like optical and magnetic. The synthesis and optical properties of transition metal doped ZnS nanoparticles with varying doping percentage is reported. The doping of ZnS with the transition metal with variable doping concentration improves the luminescence in comparison of pure ZnS. The photoluminescence spectrum has a single major peak at 780nm, and the intensity increases with the type and concentration of the impurity but at higher concentration the luminescence is quenching. This paper tries to give a comprehensive study of photoluminescence of ZnS nanoparticles doped with different transition metal with varying concentration.

Optical characterization of CTAB assisted Ni doped ZnS nanoparticles

Ni doped zinc sulphide nanoparticles at different concentration of CTAB have been prepared via solvothermal route. The structural characterization of the ZnS:Ni nanoparticles has been made using XRD technique and it reveals cubic zinc blende structure of ZnS. The crystallite size calculated from the XRD pattern is in close agreement to that estimated from the TEM image. The UV-Vis study of ZnS:Ni nanoparticles indicates the red shift in the absorption peak as compared to bulk ZnS. The emission spectra ZnS:Ni sample at 5 mmol CTAB concentration has been fitted into three Gaussian peaks.

Effect of thermal treatment on synthesized Cu doped ZnS nanoparticles

Abstract Zinc sulphide (ZnS) nanoparticles are well known as one of the important inorganic semiconductors. Bandgap, shape, size and synthesis processes are the important parameters which decide the properties of NPs. Therefore the properties of nanoparticles (NPs) can be modified for a specific application by engineering it bandgap and size. In this paper ZnS and Cu doped ZnS (Cu-ZnS) nanoparticles were synthesized by chemical co-precipitation method. The Effect of thermal treatment on Cu-ZnS nanoparticles have been investigated via various characterization techniques. XRD studies confirm the formation of ZnS and Cu-ZnS NPs. Desulphurization of synthesized Cu-ZnS NPs has been observed at temperature 450 °C and above. From UV–Vis spectra, we observed the absorption wavelength of as synthesized ZnS and Cu-ZnS NPs around 215 nm and 218 nm respectively. Red shift in the bandgap of Cu-ZnS NPs has been observed due to annealing. There is a lack of reports on the effect of annealing temperature on magnetism in transition metal doped ZnS nanoparticles. Therefore Magnetic behaviour of synthesized sample has been studied via Vibrating Sample Magnetometer measurement. We have observed that the Cu-ZnS NPs exhibit ferromagnetism. We have reported the increased saturation magnetization at 450 °C. Maximum coercivity of 270 Oe has been observed for Cu-ZnS samples annealed at 350 °C. Thus this paper highlights the effect of annealing temperature of optical, structural and magnetic properties of Cu doped ZnS nanoparticles.

Enhanced antibacterial activity of Ag-doped ZnS nanoparticles synthesised by a microwave-assisted polyol method

ABSTRACT Silver doped zinc sulphide nanoparticles were synthesised by a microwave-assisted polyol method. Characterisation of nanoparticles was performed using XRD, FESEM-EDXand UV-visible spectroscopy to investigate chemical structure, crystalline phase, particle size and surface morphology. Antibacterial properties of synthesised nanoparticles were investigated by determining their MIC and MBC values and kinetic of bactericidal activity against Staphylococcus aureus(ATCC 6538) and Escherichia coli(ATCC 25922). Characterisation of the synthesised nanoparticles showed formation of single phase of hexagonal wurtzite ZnS structure with Ag+ substitution at 1.6% Zn/Ag molar ratio. MIC values were determined as 250 and 500 µg/ml against Staphylococcus aureus and Escherichia coli, respectively and time kill profiles showed efficient and rapid bactericidal activity of the synthesised Ag-doped ZnS nanoparticles. Results of this study suggest a synthesis strategy for Ag-doped ZnS nanoparticles with potent and broad spectrum antibacterial properties that can widen the range of applications of these nanoparticles.

Luminescence study on Mn,Ni co-doped zinc sulfide nanocrystals.

Zinc sulfide (ZnS) doped with transition metal has been used as phosphor for various optoelectronic applications. In the present report, ZnS:Mn doped and ZnS:Mn,Ni co-doped were prepared using chemical co-precipitation method using polyvinyl pyrolidone as a surfactant. The structural studies were carried out using an X-ray diffraction technique; optical studies have been performed using ultraviolet-visible light absorption and photoluminescence (PL) spectroscopy. The presences of functional groups were confirmed using Fourier transform infrared spectroscopy. The X-ray diffraction study and Reitveld analysis confirms the formation of cubic phase with crystalline size 2-3 nm for undoped and doped ZnS nanoparticles. A novel and enhanced luminescence characteristic have been observed in PL spectra. The luminescence intensity of Mn,Ni co-doped ZnS in the blue region is much higher of that of ZnS. The PL results indicate that the doping of Ni creates shallow trap states or luminescence centres in the forbidden energy gap, which quenches the Mn states emission. Concentration quenching has been observed in Mn-doped ZnS nanoparticles. From CIE coordinates, it is seen that the yellow and blue light emission of ZnS:Mn,Ni co-doped nanophosphor may be a promising candidate for display devices and phosphor converted light-emitting diode applications.

Synthesis, characterization and photoluminescence studies of samarium doped zinc sulfide nanophosphors

Nanoparticles of zinc sulfide doped with samarium ions of different molar concentrations from 1 to 5 mol% were synthesized by co-precipitation method. Various metrological tools were used to characterize the as-synthesized nanoparticles for their structural, nanostructural, chemical, optical and photoluminescence characteristics. The results of powder x-ray diffraction pattern and high-resolution transmission electron microscopic images revealed the presence of samarium inside the zinc sulfide nanoparticles, with particle size between 3 and 7 nm. The purity of the ZnS:Sm nanoparticles were obtained from Fourier transform infrared spectral profiles. Large agglomeration of fine particles was shown by the scanning electron microscope images. The UV–Vis diffuse reflectance spectroscopy was used to study the optical absorption properties of the as-prepared ZnS:Sm sample. Photoluminescence studies of samarium doped zinc sulfide nanoparticles showed two major emission peaks when excited at 365 nm, one in the orange region (603 nm) and the other one in the red region (701 nm) due to f-f transitions of the Sm3+ in the 4f5configuration.

Biogenic Control of Manganese Doping in Zinc Sulfide Nanomaterial Using Shewanella oneidensis MR-1.

Bacteria naturally alter the redox state of many compounds and perform atom-by-atom nanomaterial synthesis to create many inorganic materials. Recent advancements in synthetic biology have spurred interest in using biological systems to manufacture nanomaterials, implementing biological strategies to specify the nanomaterial characteristics such as size, shape, and optical properties. Here, we combine the natural synthetic capabilities of microbes with engineered genetic control circuits toward biogenically synthesized semiconductor nanomaterials. Using an engineered strain of Shewanella oneindensis with inducible expression of the cytochrome complex MtrCAB, we control the reduction of manganese (IV) oxide. Cytochrome expression levels were regulated using an inducer molecule, which enabled precise modulation of dopant incorporation into manganese doped zinc sulfide nanoparticles (Mn:ZnS). Thereby, a synthetic gene circuit controlled the optical properties of biogenic quantum dots. These biogenically assembled nanomaterials have similar physical and optoelectronic properties to chemically synthesized particles. Our results demonstrate the promise of implementing synthetic gene circuits for tunable control of nanomaterials made by biological systems.

A novel approach to the synthesis of Zn2SiO4:Mn luminescent nanoparticles

In this study, manganese doped zinc sulfide nanoparticles with luminescence properties (Mn2+ ions) were synthesized together with silica-aerogel particles. The effect of temperature variations on the optical properties of the composite was investigated. X-ray diffraction patterns (XRD) showed the transformation of ZnS (sphalerite) to Zn2SiO4 (willemite) after heat treatment. Both silica aerogel and as-deposited SiO2–ZnS:Mn nanocomposites contained nanoparticles with emission wavelength of up to 30 nm. The heat treatment caused an obvious increase in the particle size to nanometer scale. Photoluminescence (PL) spectra revealed that ZnS:Mn possesses an emission peak at 590 nm, which was quenched by increasing the Mn content above 2.5% mol. In the as-deposited SiO2–ZnS:Mn spectra, an extra peak in the blue region was observed which is related to the silica structure. However, the heat treatment led to the appearance of strong green emission peak at 527 nm due to the formation of willemite which was quenched at higher temperatures due to the change of structure from willemite to tridymite. Finally, two luminescent inks were produced by as-deposited and heat treated SiO2–ZnS:Mn nanocomposites in water-based solvents as security inks.

Structural, morphological and antimicrobial activity of pure and aluminum doped zinc sulfide nanoparticles


 
 
 Undoped and Aluminum (Al) doped Zinc Sulphide (ZnS) Nanoparticles (NPs) has been prepared by chemical co- precipitation method using plant zinc sulphate, Aluminum sulphate and Thiourea . The X-Ray Powder Diffraction (XRD) studies reveals Cubic structure for undoped and Aluminum doped ZnS NPs. Scanning Electron Microscopy (SEM) images shows formation of smooth surfaced ZnS NPs and average particles size was found in the range of 17 nm from the result the Aluminum doped ZnS were influenced to increase ZnS NPs particle size. The disk diffusion method was used to screen the antimicrobial activity of Aluminum doped ZnS NPs against different gram positive, gram negative bacterial and fungus culture from this investigation Aluminum doped ZnS NPs have potential antimicrobial agent which was show excellent zone of inhibition (ZoI) at different concentration against all tested microorganisms.
 
 

Study the Antifungal Activity of ZnS:Mn Nanoparticles Against Some Isolated Pathogenic Fungi

An aqueous chemical reaction has been used to prepare antifungal ZnS: Mn nanostructures, from manganese chloride, zinc acetate and thioacetamide in aqueous solution. The nanoparticle size has been controlled using thioglycolic acid as a capping factor. The major feature of the ZnS:Mn nanoparticles of average diameter ∼ 2.73 nm is that possible preparing the sample from sources non-toxic precursors. The manufactured ZnS:Mn nanoparticles were identified and characterized to investigate the structure, morphology, composition of components of the nanoparticles and optical properties using (XRD, SEM, EDS and UV-Vis spectroscopy) techniques respectively. The agar dilution mechanism used to evaluate of the antifungal activity using ZnS:Mn nanoparticles which showed an efficient antifungal activity against four fungal models Aspergillus fumigatus, Aspergillus falvus, Trichophyton mentagrophyte, and Microsporum audonii the inhibition increase with the increase of nanoparticle concentration. The antifungal property of manganese doped zinc sulphide nanoparticles creates from the interaction between nanoparticles and water led to generation the interactive oxygen species. Perturbation of the cell membranes due to the existence of Zn ions and S affecting on inhibition rate. the study aimed to evaluation the Antifungal Activity of ZnS:Mn Nanoparticles Against Some Isolated Pathogenic Fungi.

Facile Microwave-assisted Synthesis Manganese Doped Zinc Sulfide Nanoparticles

Undoped and manganese doped zinc sulfide nanoparticles were produced by a fast, one-step and two-component microwave-assisted synthesis method. The solid phase retains around 78% of the initial Mn concentration, as revealed by Particle Induced X-ray Emission analysis. X-ray diffraction patterns confirmed zinc blende structure and in the transmission electron microscopy images, nanoparticles with triangular prism and cube shapes were observed, respectively with an average particle size around 7 nm and 13 nm. Dried powders of zinc sulfide nanoparticles, doped with 0.1 mol% and 0.7 mol% of Mn ions, show highest brilliance of luminescence under UV light. Increasing dopant levels resulted in a diminishing emission that vanishes above 4% of dopant concentration. The synthesis of ZnS was monitored and two main events were detected, one at 145 °C corresponding to the sol-gel phase formation and another after ~3 min at 300 °C where the precipitation of the zinc sulfide nanoparticles occurs.

Synthesis of pure and Cr doped Zinc Sulfide nanoparticles for charge transport layers applications

Pure Zinc Sulfide (ZnS) and Chromium doped Zinc Sulfide (Cr-ZnS) nanoparticles have been prepared by chemical precipitation method. The XRD patterns of Pure ZnS and Cr doped ZnS nanoparticles exhibit zinc blende and Hexagonal wurtzite phases with the average grain size of about 10 nm. The elemental composition of pure ZnS and Cr doped ZnS was confirmed by Energy Dispersive X-ray Analysis (EDX). The optical band gap of pure ZnS and Cr doped ZnS was found to be 3.4 eV and 3.25 eV respectively. The surface morphology of the pure ZnS reveals the formation of agglomeration the nanoparticles and Cr doped ZnS nanoparticles leads to nanopetals like structures.