Properties Of ZnS Nanoparticles Research Articles

Optimization of Synthesis Temperature and Study the Structural and Optical Properties of ZnS Nanoparticles via Simple Chemical Precipitation Method

Optimization of Synthesis Temperature and Study the Structural and Optical Properties of ZnS Nanoparticles via Simple Chemical Precipitation Method

Preparation and characterization of ZnS nanoparticles prepared by hydrothermal method

ZnS nanoparticles were prepared by hydrothermal method using zinc nitrate [Zn(NO[Formula: see text] ⋅ 6H2O] and thiourea [SC(NH[Formula: see text]] as sources of Zn[Formula: see text] and S[Formula: see text] ions and cetyltrimethyl ammonium bromide [CH3(CH2)[Formula: see text]N[Formula: see text](CH3)3 ⋅ Br[Formula: see text]; CTAB] as a surface active agent. The structural, surface morphology and optical properties of ZnS nanoparticles as a function of growth temperature were investigated. The studies show that ZnS nanoparticles have high transmittance over 70% in the visible light range of 400–800 nm, and it has a strong green emission band at about 520 nm which originates from the recombination of electrons from the energy level of sulfur vacancies with the holes from the energy level of zinc vacancies. With the increase of the growth temperature, the XRD peak intensity and the size of ZnS nanoparticles increase, while the green emission intensity firstly increases and then decreases.

Synthesis and properties of ZnS nanoparticles by solvothermal and pyrolysis routes using the Zn dithiocarbamate complex as novel single source precursor

ABSTRACTIn this work, the synthesis and characterization of ZnS nanoparticles prepared via two approaches, involving the thermal decomposition of the precursor complex in a furnace (pyrolysis) and by solvothermal process in the presence of hexadecylamine (HDA-ZnS), are reported. The precursor complex, Zinc (II) bis (N,N-diallyl dithiocarbamate), was synthesized and characterized by spectroscopic and single-crystal X-ray techniques. The spectroscopic analyses of the complex indicated a symmetrical bidentate coordination of the dithio ligand through the S-atoms. The single-crystal X-ray structure revealed a distorted square pyramidal coordinate geometry with S atoms around the Zn ion. The optical properties and the morphology of the as-prepared nanoparticles were studied by UV-Vis and photoluminescense spectroscopy, and transmission electron microscopy (TEM), respectively. HDA-ZnS are spherical and monodispersed with an average size of 4.5 nm, as estimated from the optical absorption spectrum and the TEM image. The ZnS nanoparticles obtained via pyrolysis in a furnace yielded the hexagonal wurtzite phase, whereas the HDA-ZnS nanoparticles showed a mixture of wurtzite and cubic phase with the cubic phase being dominant.

Correction to “Surface Properties of ZnS Nanoparticles: A Combined DFT and Experimental Study”

Correction to “Surface Properties of ZnS Nanoparticles: A Combined DFT and Experimental Study”

Influence of thiol capping on the photoluminescence properties of L‐cysteine‐, mercaptoethanol‐ and mercaptopropionic acid‐capped ZnS nanoparticles

Mercaptoethanol (ME), mercaptopropionic acid (MPA) and L-cysteine (L-Cys) having -SH functional groups were used as surface passivating agents for the wet chemical synthesis of ZnS nanoparticles. The effect of the thiol group on the optical and photoluminescence (PL) properties of ZnS nanoparticles was studied. L-Cysteine-capped ZnS nanoparticles showed the highest PL intensity among the studied capping agents, with a PL emission peak at 455 nm. The PL intensity was found to be dependent on the concentration of Zn(2+) and S(2-) precursors. The effect of buffer on the PL intensity of L-Cys-capped ZnS nanoparticles was also studied. UV/Vis spectra showed blue shifting of the absorption edge.

Computational study of the optical properties of ZnS nanoparticles

ABSTRACTUsing the density functional theory (DFT) and time dependent DFT, within the generalized gradient approximation (GGA), the electronic and optical properties of stoichiometric (ZnS)n nanoparticles (NP) were calculated. The dependence of the gap on the size (n) of the nanoparticle will be presented. The effect of replacing S atoms with P, Se or Te atoms in the (ZnS)n nanoparticles and its influence in the gap will be also shown.

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.

Photoluminescence spectra of ZnS:X− (X = F and I) nanoparticles synthesized via a solid-state reaction

ZnS:X− (X=F and I) nanoparticles have been prepared successfully via a solid-state method at low temperature, and the effects of doping with X− on the photoluminescence (PL) properties of ZnS nanoparticles have been investigated. X-ray powder diffraction (XRD), energy-dispersive X-ray spectrum (EDS), transmission electron microscope (TEM), ultraviolet–visible diffusion reflection spectra, and emission and excitation spectra were used to characterize the crystal structure, chemical compositions, diameter, surface states, and optical properties of ZnS:X− (X=F and I) nanoparticles. XRD studies showed the phase singularity of ZnS:X− particles having zinc-blende (cubic) structure with an average crystallite size 4.7–11.0nm. The results indicated that the PL of doping halogen ZnS nanoparticles can be enhanced remarkably by controlling suitable halogen doping, and the most intense emission was obtained when X/Zn=0.3 and 0.45 under 387nm excitation corresponding to X=F and I, respectively. The emission intensity of ZnS:F− (F/Zn=0.3) nanoparticles was higher than that of ZnS:I− (I/Zn=0.45), and exhibited strong emission with an intensity about 9 times higher than the undoped nanoparticles. It was found that the PL of ZnS nanoparticles doped with various halogens was decreased with the increase of the halogen ion radius.

Modification of the luminescent properties of ZnS nanoparticles by the adsorbed species

Abstract We report the modification of the luminescent properties of ZnS nanoparticles by the adsorbed chemical species. ZnS nanoparticles were prepared via microwave-assisted synthesis. The effects of the concentrations of citrate and SO4 2− ions on the optical properties were analyzed by means of UV-Vis and photoluminescence spectrophotometries, and Fourier-transform IR spectroscopy. ZnS nanoparticles were also analyzed by means of X-ray diffraction and transmission electron microscopy. The results confirm that the luminescent properties of the synthesized particles are affected by the adsorbed chemical species (citrate and SO4 2− ions). ZnS nanoparticles synthesized with 30 and 45 mM Na2SO4, and 2 mM trisodium citrate exhibit higher intensity of luminescence than those synthesized with 15 mM Na2SO4. The average diameter of the ZnS nanoparticles synthesized under these last experimental conditions is about 20 nm.

Synthesis and Optical Properties of ZnS Nanoparticles Using Multi-Mercaptan-Terminated Thio Ether as Surface Modifier

ZnS nanoparticles have been prepared by using 2, 3-dimercaptoethylthiopropanethiol (BES) as the coordinating modifier reagent to form Zn-thiol complex at low reaction temperatures. By controlling the experimental conditions, the diameter of the ZnS nanopaticles can be tuned from 43 nm to 115 nm. Systematic experiments were carried out to investigate the factors such as the amounts of the reagents (thiourea and BES) and the temperature, which have great influence on the sizes of the products. And when the content of BES is much higher, ZnS nanopaticles with mercapto surface modification were synthesized. In addition, massive blue shift in UV-vis spectra has been observed and the photoluminescence spectra of the ZnS show a strong emission at approximate 432 nm and 527 nm. Therefore, the preparation and properties studies of different ZnS sizes will offer great opportunities to explore the dependence of a material’s properties and find many interesting applications in the optical devices.

Study of Crystallization and Spectral Properties of Zinc Sulfide Nanoparticles in Mesoporous Matrix

The aim of this work is to report the optical and structural properties of ZnS nanoparticles in mesoporous matrix. The samples were obtained by sulfidation of the Zn2+ ion-exchange mesopore in a Na2S solution at room temperature. The final product (ZnS/MCM-41) was characterized by X-ray diffraction (XRD) pattern, transmission electron microscopy, scanning electron microscopy (SEM), infrared spectrometry and UV–Vis spectroscopy. Its crystalline structure and morphology was studied by XRD and SEM. Exciton absorption peaks at higher energy than the fundamental absorption edge of bulk ZnS indicates quantum confinement effects in nanoparticles as a consequence of their small size.