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Velázquez, Josian Luciano, i Sonia J. Bailón-Ruiz. "Generation of ZnS Nanostructures with Modified Chemical Surface". MRS Advances 4, nr 38-39 (2019): 2095–102. http://dx.doi.org/10.1557/adv.2019.226.
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ABSTRACTSemiconductor nanomaterials like zinc sulphide have interesting potential applications, consequent to their size-dependent optical properties. These nanostructures can be used on optoelectronic, photocatalysis, solar cells, and fluorescence microscopy, among others. Due to the great use of these nanoparticles in society, there is great concern in the scientific community about the potential negative interaction of these nanomaterials in aquatic environments. The present research was conducted on generation of nanostructures of ZnS with modified surface. This work had three goals: 1) morphological, compositional, and optical characterization of ZnS nanoparticles; 2) surface chemical modification of ZnS nanoparticles with biocompatible molecules; and 3) interaction studies of ZnS nanoparticle. A main absorption peak at ∼365-375nm range and a trap emission peak at ∼425nm were observed in the emission spectrum of ZnS nanoparticles synthesized at 160°C and 180°C and 30 minutes of reaction. The morphology and the size of ZnS were carried out by High Resolution Transmission Electron Microscopy (HR-TEM). In this way, nanoparticles were spherical and with a size less than 10nm. Energy Dispersive X-Ray Spectroscopy evidenced the chemical composition of produced nanostructures. The chemical modification of ZnS nanostructures was corroborated by Infrared Spectroscopy Analysis. The interaction studies of ZnS nanoparticles were studied in aquatic systems in presence of marine organisms. The concentrations of nanoparticles for these studies ranged from 0ppm to 300ppm and the contacting time with the living organisms was 24 and 48 hours. Also, Zn2+ (as Zinc nitrate and Zinc sulphate) was used as comparison purposes. Zinc sulphide nanoparticles covered with thioglycolic acid and L-cysteine evidenced a negative interaction at concentrations higher than 10ppm.
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Chatterjee, Nilanjana, i Baibaswata Bhattacharjee. "An Analytic Contemplation of the Conspicuous Vicissitudes in the Histomorphology of Corpuscles of Stannius of a Freshwater CatfishMystus tengara(Hamilton, 1822) due to the Exposure of ZnS Nanoparticles". Scientifica 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/697053.
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Enhanced surface photooxidation property associated with the ZnS nanoparticles caused the reduction of dissolved oxygen content in water in a dose dependent manner, when ZnS nanoparticles of different sizes are exposed to the water in various concentrations. This property was more prominent for ZnS nanoparticles with smaller sizes.Mystus tengara, exposed to ZnS nanoparticles, responded to hypoxia with varied behavioural, physiological, and cellular responses in order to maintain homeostasis and organ function in an oxygen-depleted environment. The histomorphology of corpuscles of Stannius of the fish showed conspicuous vicissitudes under exposure of ZnS nanoparticles. The population of the cell type with granular cytoplasm showed significant increase at the expense of the other that consisted of agranular cytoplasm with increasing nanoparticle concentration. This can be explained as the defence mechanism of the fish against ZnS nanoparticle induced hypoxia and environmental acidification. The altering histomorphology has been studied employing an analytical approach.
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Huang, Hsin-Liang, H. Paul Wang, Edward M. Eyring i Juu-En Chang. "Recovery of nanosize zinc from phosphor wastes with an ionic liquid". Environmental Chemistry 6, nr 3 (2009): 268. http://dx.doi.org/10.1071/en08098.
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Environmental context. Very fine phosphor ashes are discharged from particulate collection systems (such as bag houses) in the cathode ray tube or television disassembling processes. Effective recovery of ZnO and ZnS nanoparticles from the phosphor ash can be achieved by extraction with a room temperature ionic liquid. By synchrotron radiation X-ray absorption spectroscopy, the obtained molecular scale data turn out to be very useful in revealing speciation of zinc in the extraction process, which also facilitates the development of a simple nanoparticle recovery method. Abstract. An effective, simple method has been developed for the recovery of ZnO and ZnS nanoparticles from hazardous phosphor ash waste. Experimentally, zinc (77%) in the phosphor ash (that contains mainly zinc (91%)) can be recovered by extraction with a room temperature ionic liquid (RTIL) ([C4mim][PF6], 1-butyl-3-methylimidazolium hexafluorophosphate). Component fitted X-ray absorption near edge structure (XANES) spectra of zinc indicate that metallic zinc (Zn) (9%) in the phosphor ash can be dissolved to form a Zn2+–1-methylimidazole ([mim]) complex during extraction with the RTIL. ZnS and ZnO nanoparticles (60–61%) can also be extracted from the phosphor. Over the 298–523 K temperature range, desired ZnO/ZnS ratios (0.3–0.6) can be obtained since interconversion of ZnS to ZnO in the RTIL is temperature dependent. The Fourier transformed extended X-ray absorption fine structure (EXAFS) data also show that the nanosize ZnS extracted in the RTIL possesses a Zn–S bond distance of 2.33 Å with coordination numbers (CNs) of 3.6–3.7. At 523 K, in the RTIL, ~30% of the ZnS is oxidised to form octahedral ZnO (with a bond distance of 2.10 Å and a CN of 6.1) that may coat the surfaces of the ZnS nanoparticles. This work exemplifies the utilisation of X-ray absorption spectroscopy (EXAFS and XANES) to reveal speciation and possible reaction pathways in a nanoparticle extraction process (with a RTIL) in detail.
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Mirnaya, Tatiana, Galina Yaremchuk i Alexander Kosheliev. "SYNTHESIS AND OPTICAL PROPERTIES OF MESOMORPHIC GLASSY NANOCOMPOSITES BASED ON CADMIUM CAPRYLATE WITH CdSe / ZnS HETERONANOPARTICLES". Ukrainian Chemistry Journal 85, nr 1 (15.02.2019): 13–18. http://dx.doi.org/10.33609/0041-6045.85.1.2019.13-18.
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The paper presents on the synthesis and optical properties of mesomorphic composites, based on a glassy liquid-crystalline caprylate matrix, with CdSе/ZnS hetero-nanoparticles. The synthesis of complex core-shell semiconductor nanoparticles was carried out by fusing together a cadmium caprylate composite with CdSе nanoparticles and zinc caprylate composite with ZnS nanoparticles. The cadmium and zinc chalcogenide nanoparticles have been synthesized in molten cadmium caprylate and zinc caprylate respectively.
It has been found by optical spectroscopy that the have hetero-nanoparticles a core-shell structure. The effect of the composition (molar ratio of the components) of CdSе/ZnS hetero-nanoparticles on their spectral characteristics has been studied. It has been shown that the nanocomposites with hetero-nanoparticles are characterized by a more intense exciton fluorescence band than composites with individual CdSе or ZnS nanoparticles. It has been found that by varying the hetero-nanoparticle composition, one can change the core-shell thickness ratio and adjust thereby the absorption and emission band edge. As the number of ZnS nanoparticles in CdSе/ZnS hetero-nanoparticles increases some narrowing of the long- wavelength emission region first takes plase, which may be attributed to a reduction in the recombination of the smaller number of surface trapped exciton, and then, at a large ZnS content, a broadening of the long- wavelength emission region takes plase due to the extended CdSе/ZnS surface.
It has been found that the main contribution to the exciton fluorescence of nanocomposites with CdSе/ZnS hetero-nanoparticles is made by cadmium selenide nanoparticles, and that zinc sulfide nanoparticles enhance exciton fluorescence, also due to decrease in surface emission. It has been shown that the nanocomposites with hetero-nanoparticles are characterized by a more intense exciton fluorescence band that the nanocomposites with individual CdSе. The highest emission is observed in the case of the 35-55 % ZnS content of the shell, and at a smaller or larger amount of ZnS, emission intensity decreases.
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Hu, Siyi, Yu Ren, Yue Wang, Jinhua Li, Junle Qu, Liwei Liu, Hanbin Ma i Yuguo Tang. "Surface plasmon resonance enhancement of photoluminescence intensity and bioimaging application of gold nanorod@CdSe/ZnS quantum dots". Beilstein Journal of Nanotechnology 10 (3.01.2019): 22–31. http://dx.doi.org/10.3762/bjnano.10.3.
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Biological applications of core/shell near-infrared quantum dots (QDs) have attracted broad interest due to their unique optical and chemical properties. Additionally, the use of multifunctional nanomaterials with near-infrared QDs and plasmonic functional nanoparticles are promising for applications in electronics, bioimaging, energy, and environmental-related studies. In this work, we experimentally demonstrate how to construct a multifunctional nanoparticle comprised of CdSe/ZnS QDs and gold nanorods (GNRs) where the GNRs were applied to enhance the photoluminescence (PL) of the CdSe/ZnS QDs. In particular, we have obtained the scattering PL spectrum of a single CdSe/ZnS QD and GNR@CdSe/ZnS nanoparticle and comparison results show that the CdSe/ZnS QDs have an apparent PL enhancement of four-times after binding with GNRs. In addition, in vitro experimental results show that the biostability of the GNR@CdSe/ZnS nanoparticles can be improved by using folic acid. A bioimaging study has also been performed where GNR@CdSe/ZnS nanoparticles were used as an optical process for MCF-7 breast cancer cells.
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Bhattacharjee, Baibaswata, Nilanjana Chatterjee i Chung-Hsin Lu. "Harmful Impact of ZnS Nanoparticles on Daphnia sp. in the Western Part (Districts of Bankura and Purulia) of West Bengal, India". ISRN Nanomaterials 2013 (16.09.2013): 1–7. http://dx.doi.org/10.1155/2013/207239.
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ZnS nanoparticles of different sizes are synthesized employing a simple wet chemical method. These nanoparticles are used to study their impact on the Daphnia sp. through traditional toxicity tests. The percentage of mortality is found to increase initially with increasing nanoparticle concentration or exposure time and is finally found to saturate for higher concentrations or exposure times. Mortality is found to be higher for smaller particles. Hopping frequency and heart rate are also found to increase with increasing nanoparticle exposure time for a fixed nanoparticle concentration. These observations can be attributed to the enhanced surface photooxidation property of the ZnS nanoparticles. Thus the present study will help people to understand the hitherto unknown harmful impact of ZnS nanoparticles on aquatic organisms in the western part of West Bengal (Bankura and Purulia districts), India.
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I. Korsunskiy, Vladimir, Reinhard B. Neder, Andreas Hofmann, Sofia Dembski, Christina Graf i Eckart Rühl. "Aspects of the modelling of the radial distribution function for small nanoparticles". Journal of Applied Crystallography 40, nr 6 (10.11.2007): 975–85. http://dx.doi.org/10.1107/s0021889807038174.
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An approach to modelling radial distribution functions (RDFs) of nanoparticle samples over a wide range of interatomic distances is presented. Two different types of contribution to the model RDF are calculated. The first explicitly reflects the structure of the nanoparticle parts with more or less crystalline atomic structure. It can be calculated precisely and contains comparatively sharp peaks, which are produced by the set of discrete interatomic distances. The second includes RDF contributions from distances between weakly correlated atoms positioned within different nanoparticles or within different parts of a nanoparticle model. The calculation is performed using the approximation of a uniform distribution of atoms and utilizes the ideas of the characteristic functions of the particle shape known in small-angle scattering theory. This second RDF contribution is represented by slowly varying functions of interatomic distancer. The relative magnitude of this essential part of the model RDF increases with increasingrcompared with the part that represents the ordered structure. The method is applied to test several spherical and core/shell models of semiconductor nanoparticles stabilized with organic ligands. The experimental RDFs of ZnSe and CdSe/ZnS nanoparticle samples were obtained by high-energy X-ray diffraction at beamline BW5, HASYLAB, DESY. The ZnSe nanoparticles have a spherical core with approximately 26 Å diameter and zincblende structure. The RDF of the CdSe/ZnS nanoparticle sample shows resolved peaks of the first- and the second-neighbour distances characteristic for CdSe (2.62 and 4.27 Å) and for ZnS (2.33 and 3.86 Å) and for the first time clearly confirms the presence of CdSe and ZnS nanophases in such objects. The diameters of the CdSe and ZnS spherical cores are estimated as 27 and 15 Å. CdSe and ZnS are present in the sample for the most part as independent nanoparticles. A smaller amount of ZnS forms an irregularly shaped shell around the CdSe cores, which consists of small independently oriented ZnS particles.
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Vasan, R., F. Gao, M. O. Manasreh i C. D. Heyes. "Investigation of charge transport between nickel oxide nanoparticles and CdSe/ZnS alloyed nanocrystals". MRS Advances 2, nr 51 (2017): 2935–41. http://dx.doi.org/10.1557/adv.2017.488.
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ABSTRACTCharge transport between nickel oxide nanoparticles and CdSe/ZnS alloyed core/shell nanocrystals is investigated. The crystal structure and composition of the nickel oxide nanoparticles are evaluated using X-ray diffraction, Raman and X-ray photoelectron spectroscopies. The nanoparticles are near-stoichiometric with very low defect densities. The optical properties of the materials are studied by measuring the absorbance and time resolved photoluminescence spectra. The band gap of the nickel oxide nanoparticles is around 4.42 eV. The CdSe/ZnS nanocrystals exhibit shorter average lifetimes when mixed with nickel oxide nanoparticle powder. The lifetime quenching can be attributed to the efficient charge transport from the CdSe/ZnS nanocrystals to nickel oxide nanoparticles due to the relative valence band alignment.
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Sunatkari, Swarnalata. "Study of structural and spectroscopic characterization of co-doped ZnS Nanoparticles capped with L-Arginine". Journal of Physics: Conference Series 2426, nr 1 (1.02.2023): 012036. http://dx.doi.org/10.1088/1742-6596/2426/1/012036.
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Abstract The aim of the present study was to prepare ZnS nanoparticles co-doped with Li+-Cs+, were synthesized using a chemical co-precipitation method. The ZnS-(Li+-Cs+) nanoparticle’s were capped with L- Arginine and reduced using sodium sulphide. The main advantage of this method is to synthesized semiconductor nanomaterial with wide band gap and nanoparticles are chemically stable over a long time. The as prepared nanoparticles were characterised by X-Ray Diffraction technique for phase analysis of the sample. Particle size is found in the range of 2 to 4 nm calculated by Debye Scherer method. XRD confirms the evolution of stable cubic zinc blend phase of ZnS nanoparticles. The strong interaction between the capping agent L- arginine, Zn and S is revealed from the Fourier Transform Infrared (FTIR) spectrum.
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Rai, S., i R. Kothari. "Synthesis and Spectroscopic Characterization of Zinc Sulphide nanoparticles using Microwave irradiation of Zinc complex of Thiosemicarbazone ligand as a Single Molecular precursor : Pharmacological activities". Digest Journal of Nanomaterials and Biostructures 18, nr 1 (styczeń 2023): 31–45. http://dx.doi.org/10.15251/djnb.2023.181.31.
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Single molecular precursors are appropriate starting materials for synthesis of semiconductor nanoparticles (NPs), which allow for the control of atomic ratio, monodispersity, composition and particle size of nanoscaled metallic sulfide nanoparticles. In the present study, we have reported the synthesis of nanostructured chalcogenides pharmacologically active active zinc sulfide nanoparticles (ZnS NPs) using Zn (II) ion inserted thiosemicarbazone ligand as a single molecular precursor .The precursors were thermally pyrolysized using high energy microwave radiations to obtain very fine ZnS nanoparticles. In this synthesis, we use DMSO as a nonpolar solvent for the synthesis of all compounds. The heating of Zinc complex in the non- aqueous environment of DMSO plays a very crucial role in decreasing reaction time, reducing the chances of side reactions and proper conversion of Zn complex into ZnS nanoparticles. In this reaction Zn complex of thiosemicarbazone ligand provides both Zn2+ and S2- ions for synthesis of ZnS nanoparticles. The microwave synthesis of ZnS NPs from Zn complex is a very simple, fast, highly effective, efficient and low cost method. All synthesized compounds were characterized by various structural, electronic, vibrational, optical, morphological and pharmacological characterizations. The prepared ZnS NPs were found to crystallize in cubic phase, which generally forms at low temperatures, with the dimensions dependent upon the molar ratio of molecular precursors used. Synthesized ZnS nanomaterials had surface sulfur vacancies that extend their absorption spectra towards the visible region and decreased the bond gap. This allowed ZnS nanoparticles to demonstrate various pharmacological activities like antibacterial, antioxidant and anti-inflammatory activities under normal conditions. Powered X-ray diffraction studies confirms the formation of well -defined equispaced crystalline ZnS NPS. TEM and FE SEM microscopic studies confirmed the elongated tubules structure of ZnS NPs with an average particle size of 60 nm. Sharpe electronic absorption band at 390 nm indicates the synthesis of good quality ZnS NPs. The FT-IR spectral studies confirmed the presence of Zn-S stretching, N-H bending and C=N stretching, vibrations in molecular precursor as Zn(II) complex. The thermal analysis of molecular precursor was performed to investigate the thermal stability of zinc complex. The Zn complex was stable up-to 3800 c. All synthesized compounds demonstrated excellent pharmacological activities like antibacterial, antioxidant and antiinflammatory activities as compared to standards used in analysis of compounds. The microwave synthesis of ZnS nanoparticles via single molecular precursor in proper stoichiometric ratios is an excellent and an efficient method for synthesizing highly effective bioactive agents which can be considered as good drug candidate for the treatment of various diseases in future
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Maswanganye, Mpho W., Guy L. Kabongo i Mokhotjwa S. Dhlamini. "Modulating Charge Mobility in Microwave Synthesized Ti-doped ZnS Nanoparticles for Potential Photoanode Applications". Nanomaterials 13, nr 1 (23.12.2022): 77. http://dx.doi.org/10.3390/nano13010077.
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Doping ZnS nanoparticles with different metal and/or non-metal ions is one of the ways to improve their properties. That is because dopants introduce strain into the lattice of the ZnS nanoparticles. The influence of Ti on the ZnS nanoparticles was investigated on the structural properties, optical properties, and also electrical impedance spectroscopy (EIS). The presence of Ti in the crystal lattice of the ZnS introduced strain into the crystal structure, hence causing a lattice expansion and reducing the crystallite sizes of the ZnS nanoparticles. Ti doping was observed to increase the energy band gap of ZnS nanoparticles and also reduce the charge carrier recombination. Doping Ti into ZnS was observed to decrease the charge transfer resistance of ZnS nanoparticles with an increase in dopant concentration indicating an improved charge transfer mobility owing to the presence of strain in the crystal lattice.
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KAREEM, T. ABDUL, i A. ANU KALIANI. "I-V characteristics and the synthesis of ZnS nanoparticles by glow discharge at the metal–ionic liquid interface". Journal of Plasma Physics 78, nr 2 (21.12.2011): 189–97. http://dx.doi.org/10.1017/s0022377811000560.
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AbstractA plasma chamber was constructed for the synthesis of ZnS nanoparticles in ionic liquid by glow discharge electrolysis method. Current and voltage (I-V) characteristics of the discharge at the metal–ionic liquid interface showed that the curve follows Ohm's law up to a particular voltage only so that the ZnS nanoparticle preparation was performed after the critical voltage. X-ray diffraction and energy dispersive spectral analysis showed that the samples contain ZnS nanoparticles and also found that tungsten from the metal electrode dissolved in the BMIM[BF4] ionic liquid under plasma and formed tungstic oxide by accepting atmospheric oxygen.
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Manjulavalli, T. E., i A. G. Kannan. "Structural and Optical Characterization of Pure and Mn2+ -Doped ZnS Nanoparticles Prepared by Solvothermal Method". Advanced Materials Research 678 (marzec 2013): 61–66. http://dx.doi.org/10.4028/www.scientific.net/amr.678.61.
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ZnS and Mn2+doped ZnS nanoparticles are synthesized through a simple solvothermal method. The structural and optical properties of pure and doped ZnS nanoparticles were studied using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorption and photoluminescence spectroscopy (PL). X-ray diffraction analysis reveals that undoped and Mn2+doped ZnS crystallizes in cubic structures. The average grain size of the nanoparticles lies in the range of 2.2 to 4.8 nm. The SEM image shows that pure and doped nanoparticles are in spherical shape. The optical absorption spectrum exhibits a clear blue shift for ZnS and Mn2+doped ZnS nanoparticles when compared with bulk ZnS. Photoluminescence spectra recorded for ZnS nanoparticles exhibits an emission peak centered around 428 nm for an excitation wavelength of 330 nm. However, for Mn2+doped samples, an yellow–orange emission is observed along with the blue emission.
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Murali, G., D. Amaranatha Reddy, R. P. Vijayalakshmi i R. Venugopal. "Structural and Optical Characteristics of Ni Doped ZnS Nanoparticles". Advanced Materials Research 678 (marzec 2013): 159–62. http://dx.doi.org/10.4028/www.scientific.net/amr.678.159.
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Nanocrystalline ZnS and Ni doped ZnS powders were synthesized by a simple chemical co-precipitation method at room temperature using sodium sulfide and acetates of Zinc and Nickel. 2-Mercapto ethanol is used as a capping agent. Structural and optical properties of as prepared samples were characterized using X-Ray diffraction (XRD), Scanning electron microscopy (SEM), Energy Dispersive Analysis using X-rays (EDAX) and Photoluminescence studies (PL). EDAX measurements confirmed the presence of Zn, Ni and S in the prepared samples. XRD analysis reveals that the Zn1-xNixS (x= 0.00 and 0.01) nanoparticles crystallized in zincblende structure. The average particle sizes of the nanoparticles are in the range of 2-3 nm. Shifting of photo luminescence peak to higher wavelength along with intensity quenching is observed for doped ZnS nanocrystals (NCs).
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Расмагин, С. И., i И. К. Новиков. "Оптические свойства наночастиц CdSe/ZnS в пленках термообработанного поливинилхлорида". Журнал технической физики 53, nr 4 (2019): 508. http://dx.doi.org/10.21883/ftp.2019.04.47450.9016.
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AbstractComposites based on polyvinylchloride with incorporated CdSe/ZnS nanoparticles are produced. The optical and electrical properties of the polymer composites containing CdSe/ZnS nanoparticles are studied. The absorption and photoluminescence spectra of the composites are recorded, and their bulk resistivities are measured. The CdSe nanoparticle dimensions are determined. It is established that, upon short-term heat treatment, the photoluminescence intensity increases, whereas upon heating for a long time, the photoluminescence intensity substantially decreases.
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Wang, H. Y., Yi Yang Zhao, Z. Y. Li, Xiao Feng Lu, C. Wang i Yen Wei. "Preparation and Characterization of Poly(Vinyl Alcohol) Nanofibers Containing ZnS Nanopaticles via Electrospinning". Solid State Phenomena 121-123 (marzec 2007): 641–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.641.
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Poly(vinyl alcohol) (PVA) nanofibers containing functional ZnS nanoparticles have been successfully prepared by electrospinning technique. The ZnS/PVA mixture solution for electrospinning was obtained by reacting Zn(Ac)2 with Na2S in the PVA aqueous solution. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses revealed that the morphology of the ZnS/PVA nanofibers consists of the dispersion of ZnS nanopaticles with cubic structure in PVA nanofibers. The coordinations between –OH and Zn2+ were characterized by infrared spectroscopy. The photoluminescence spectroscopy studies showed that the ZnS/PVA nanofibers had a strong blue-violet emission band at 450 nm, which may be associated with defect-related emission of the ZnS.
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ANAND, K. VIJAI, R. MOHAN, R. MOHAN KUMAR, M. KARL CHINNU i R. JAYAVEL. "CONTROLLED SYNTHESIS AND CHARACTERIZATION OF CERIUM-DOPED ZnS NANOPARTICLES IN HMTA MATRIX". International Journal of Nanoscience 10, nr 03 (czerwiec 2011): 487–93. http://dx.doi.org/10.1142/s0219581x11008253.
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Cerium-doped ZnS nanoparticles have been synthesized through hydrothermal method. The nanoparticles were stabilized using hexamethylenetetramine (HMTA) as surfactant in aqueous solution. The average particle size of the prepared samples is about 2 nm. The structure of the as-prepared ZnS nanoparticles is cubic (zinc blende) as demonstrated by X-ray powder diffraction (XRD) and selected area electron diffraction (SAED) analysis. TEM results showed that the synthesized nanoparticles were uniformly dispersed in the HMTA matrix without aggregation. The UV–Vis absorption spectra of the prepared ZnS nanoparticles show a considerable blueshift in the absorption band edge compared to bulk ZnS indicating a strong quantum confinement effect. Formation of HMTA-capped ZnS nanoparticles was confirmed by FTIR studies. Photoluminescence studies showed that the relative emission intensity of Ce3+ -doped ZnS nanoparticles is higher than that of undoped ZnS nanoparticles, which is due to the enhancement of radiative recombination in the luminescence process. The PL spectra showed two emission peaks at around 420 nm and 442 nm, which may be attributed to deep-trap emission or defect-related emission of ZnS and presence of various surface states.
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Fan, Xiao Hui, Hong Juan Liu, Yan Ming Chen i Ting Sun. "Synthesis and Characterization of ZnS Nanoparticles by Using Polyvinylpyrrolidone as Stabilizer". Advanced Materials Research 625 (grudzień 2012): 269–72. http://dx.doi.org/10.4028/www.scientific.net/amr.625.269.
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A simple synthesis method of PVP (polyvinylpyrrolidone) coated ZnS QDS has been developed. The optical properties and morphology for the as-synthesized ZnS nanoparticles were characterized by UV-Vis absorption spectroscopies and transmission electron microscopy (TEM). The results show that PVP could act as a better stabilizer for the formation of ZnS nanoparticles in N, N-dimethylformamide. The obtained ZnS nanoparticles have spherical morphology and a narrow size distribution. ZnS nanoparticles could give an apparent extionic absorption peaks and quantum confinement effects.
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L, Priya. "Synthesis and Characterization of Photoluminescent PVA/ZnS: Mn2+ Nanocomposites". Mapana - Journal of Sciences 12, nr 1 (22.01.2013): 31–37. http://dx.doi.org/10.12723/mjs.24.4.
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A ZnS nanoparticle doped with Mn2+ is synthesized in aqueous media and PVA using chemical co-precipitation method. This colloid was analyzed using uv-vis spectrophotometry. It is observed that the absorption peak blue shifts as compared to the bulk absorption of ZnS suggesting the nanoparticle formation. The energy gaps of these nanoparticles were calculated from the uv-vis spectra. The average particle size analysis is carried out using XRD. Photoluminescence of PVA/ ZnS:Mn2+ is studied. It is observed that the composite sample exhibits an orange emission peak as is reported for pure ZnS: Mn2+.
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Gopalakrishnan, M., Issac P. Nelson i Solomon Jeevaraj A. Kingson. "Synthesis and Characterization of Pure and Mn Doped Zinc Sulphide Nanoparticles and Nanofluids". Advanced Materials Research 1086 (luty 2015): 101–6. http://dx.doi.org/10.4028/www.scientific.net/amr.1086.101.
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In this work, pure ZnS and Mn doped ZnS nanoparticles are synthesized by simple chemical precipitation method. The structure of pure zinc sulphide and Mn doped zinc sulphide sample are analyzed by X-ray diffraction technique. The morphological structure of zinc sulphide and Mn2+doped zinc sulphide nanoparticles are studied using scanning electron microscope (SEM). The average particle sizes of pure ZnS nanoparticles are determined to be from 29 nm to 44 nm and Mn doped ZnS nanoparticles are determined to be from 99 nm to 135 nm. The optical properties of pure and Mn doped ZnS nanoparticles have been investigated by photoluminescence (PL) spectroscopy. The emission spectrum of Mn2+doped with ZnS particles of the present study shows blue shift of the yellow-orange emission peak at 590 nm. Nanofluids are prepared for six different concentrations by dispersing pure and Mn2+doped ZnS nanoparticles in de-ionized water. Thermal conductivity studies are carried out for both nanofluid systems and the results are discussed.
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Wang, Zhen-Hua, Dian-Yu Geng, Da Li i Zhi-Dong Zhang. "Cluster spin-glasslike behavior in nanoparticles of diluted magnetic semiconductors ZnS:Mn". Journal of Materials Research 22, nr 9 (wrzesień 2007): 2376–83. http://dx.doi.org/10.1557/jmr.2007.0317.
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Zn1−xMnxS nanoparticles with x = 0.08, 0.16, and 0.32 were synthesized by a coprecipitation reaction between nitrate and sodium sulfide at room temperature in air. The magnetic properties of the Zn1−xMnxS nanoparticles were investigated by alternating-current (ac) susceptibility and direct-current (dc) magnetization measurements. The Mn3O4 phase was observed to exist in the Zn1−xMnxS nanoparticles as x ⩾ 0.16. The actual concentrations (x) of Mn-doped ZnS nanoparticles were determined by energy-dispersive x-ray analysis (EDAX) to be 0.06, 0.11, and 0.20, respectively, corresponding to the initial concentrations x = 0.08, 0.16, and 0.32. All the nanoparticles had the cubic structure and the lattice constant of Zn1−xMnxS phase increased with increasing Mn dopant concentration. For the Zn0.68Mn0.32S nanoparticles, there was evidence for appearance of cluster spin-glasslike behavior, as indicated by two maxima around 15 and 25 K in temperature dependence of ac susceptibility. The frequency independence of the peak at higher temperature is related to the intracluster ferromagnetic (FM) interactions, and the frequency dependence of the peak at lower temperature is associated with the spin glass. All the results revealed that the concentration of Mn2+ in Mn–ZnS and the amount of Mn3O4 were crucial for the cluster spin-glass behavior, which was not found when the real concentration (x) was unequal to 0.20 in Zn1−xMnxS.
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Ali I . Khaleel, Khalaf F. Al-Samarrai i Marwan A. mahmood. "Analytical Study of Zinc Sulphide Electrode Prepared from Nano material". Tikrit Journal of Pure Science 21, nr 6 (8.02.2023): 61–66. http://dx.doi.org/10.25130/tjps.v21i6.1080.
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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.
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Othman, Razhan S., Rebaz A. Omar, Karzan A. Omar, Aqeel I. Gheni, Rekar Q. Ahmad, Sheyma M. Salih i Avan N. Hassan. "Synthesis of Zinc Sulfide Nanoparticles by Chemical Coprecipitation Method and its Bactericidal Activity Application". Polytechnic Journal 9, nr 2 (1.12.2019): 156–60. http://dx.doi.org/10.25156/ptj.v9n2y2019.pp156-160.
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A particle of zinc sulfide (ZnS) was synthesized by the chemical coprecipitation method using zinc sulfate heptahydrate (ZnSO4), ammonium sulfate (NH4)2SO4 as a reactant, and thiourea as a stabilizer and capping agent. The optioned product characterized by electron dispersive X-ray spectroscopy that exhibits the presence of Zn and S elements. The average particle size of the ZnS nanoparticles determined using X-ray diffraction is about 4.9 nm. The ultraviolet–visible spectroscopy showed the blue shift in wavelength and the band gap was 4.33 eV, the surface morphology of the synthesized ZnS nanoparticles powder was studied by scan electron microscopy which was showed the irregular and some spherical shapes of ZnS in a nanosized range. The Fourier-transform infrared spectroscopy observed an absorption peck at 657.73 and 613.36 cm−1 that were assigned to the stretching mods of the Zn-S band. The different amounts of ZnS nanoparticle were applied as bactericidal against Staphylococcus aureus by disk diffusion method. It displayed activity against S. aureus bacteria, which was carried out in the absence of irradiation.
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Kovář, Petr, Petr Praus, Miroslav Pospísil i Richard Dvorský. "Molecular modelling of zinc sulphide nanoparticles stabilized by cetyltrimethylammonium bromide". Journal of the Serbian Chemical Society 79, nr 12 (2014): 1545–59. http://dx.doi.org/10.2298/jsc131115050k.
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ZnS nanoparticles stabilized by cetyltrimethylammonium bromide (CTAB) were modelled in the Materials Studio environment. Four types of models with different distances between ZnS nanoparticles and different amounts of CTA cations without water and in water environment were built and characterized by calculated sublimation energies. The results of molecular modelling without water showed that the most favourable model consisted of two ZnS nanoparticles with a distance of 8-9 nm separated without immersing of CTAs. On the contrary, the most favourable model in water environment was composed of ZnS nanoparticles that nearly touched each other. CTA cations exhibited tendency to be located on the ZnS surface forming sparse covers. Size distributions of ZnS-CTA particles obtained by TEM measurements well agreed with molecular modelling results.
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Chatterjee, Nilanjana, i Baibaswata Bhattacharjee. "Revelation of ZnS Nanoparticles Induces Follicular Atresia and Apoptosis in the Ovarian Preovulatory Follicles in the CatfishMystus tengara(Hamilton, 1822)". Scientifica 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3927340.
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Important physicochemical characteristics of water like dissolved oxygen content, pH, and so forth were found to change in a dose dependent manner, showing a negative correlation with the nanoparticle concentration, when ZnS nanoparticle (NP) was exposed to water. This observation could be attributed to the enhanced photooxidation property associated with ZnS in its NP form. Under this situation, the catfishMystus tengarawas forced to live in hypoxia in its habitat. This condition was found to hamper the natural oogenesis process of the fish. Due to exposure at relatively lower concentration of ZnS NPs (250 μg/L), most of the maturing follicles ofM. tengarafailed to complete the process of vitellogenesis properly and underwent preovulatory atresia followed by oocytic apoptosis. For relatively higher concentration of ZnS nanoparticles (500 μg/L), the previtellogenic process continued with increasing number of apoptotic cells; however the vitellogenic process was found to be totally blocked. This unusual reproductive behaviour in femaleM. tengaracan be attributed to the decreased metabolism of the fishes under ZnS nanoparticle induced hypoxia.
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Chen, Wei, Zhanguo Wang, Zhaojun Lin i Lanying Lin. "Thermoluminescence of ZnS nanoparticles". Applied Physics Letters 70, nr 11 (17.03.1997): 1465–67. http://dx.doi.org/10.1063/1.118563.
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Tang, Luping, Chen Liao, Yingqing Guo i Yangyang Zhang. "Controllable Preparation of Ag-SiO2 Composite Nanoparticles and Their Applications in Fluorescence Enhancement". Materials 16, nr 1 (26.12.2022): 201. http://dx.doi.org/10.3390/ma16010201.
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Metal nanoparticles have attracted a great deal of interest due to their unique properties of surface plasmon resonance. Metal nanoparticles can enhance the fluorescence emission intensity of quantum dots (QDs) through the local surface plasmon resonance effect, which is mainly determined by the distance between them. Therefore, it is very important to achieve controllable distance between metal and QDs, and study fluorescence enhancement. In this work, the controllable adjustment of the distance between metal nanoparticles and QDs was successfully realized by controlling the thickness of the SiO2 shell of Ag@SiO2 nanoparticles. Firstly, Ag nanoparticles with uniform size distribution and relatively high concentration were prepared, and then the thickness of the SiO2 shell was controlled by controlling the amount of tetra-ethyl orthosilicate (TEOS) in the hydrolysis of TEOS reaction. (3-aminopropyl) triethoxysilane (APS) was used to connect CdS/ZnS QDs with Ag@SiO2 nanoparticles to form Ag@SiO2@CdS/ZnS QD composite nanoparticles. The fluorescence spectra shows that the fluorescence intensity of the Ag@SiO2@CdS/ZnS QD composite nanoparticles is significantly enhanced. Photoexcitation spectra and fluorescence spectra of CdS/ZnS QD and Ag@SiO2@CdS/ZnS QD composite nanoparticles, measured under different energy excitation conditions, indicate that the existence of Ag nanoparticles can enhance the fluorescence intensity of CdS/ZnS QDs. Finally, a further physical mechanism of fluorescence enhancement is revealed.
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Poornaprakash, B., P. T. Puneetha, M. S. P. Reddy i Y. L. Kim. "Structural, optical, and photocatalytic activity of ZnS:Er nanoparticles". Chalcogenide Letters 20, nr 2 (23.02.2023): 85–90. http://dx.doi.org/10.15251/cl.2023.202.85.
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ZnS and Er (2 at%) doped ZnS nanoparticles (NPs) were synthesized through coprecipitation process. EDAX analysis confirmed that the presence of Er (III) ions in the prepared sample with an anticipated stoichiometry. TEM analyses displayed that the prepared NPs showed near spheroid shapes with an average size ranging from 4.8 to 5.2 nm. XRD measurements confirmed the authentic incorporation of Er (III) ions in the ZnS lattice. DRS measurements certified that Er (III) doping declines the ZnS bandgap from 3.72 to 3.56 eV. Magnetic measurements revealed that the Er-doped ZnS NPs displayed soft ferromagnetism and became better at higher doping concentrations. The Er (2 at%) doped ZnS NPs exhibited a higher rhodamine B dye degradation rate than the ZnS. Hence, the Er doped ZnS NPs are promising materials for dye degradation and optoelectronics.
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Vijai Anand, K., G. Vinitha, M. Karl Chinnu, R. Mohan i R. Jayavel. "Enhanced third-order nonlinear optical properties of high purity ZnS nanoparticles". Journal of Nonlinear Optical Physics & Materials 24, nr 02 (czerwiec 2015): 1550016. http://dx.doi.org/10.1142/s0218863515500162.
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This paper reports on the preparation of high purity ZnS nanoparticles by a facile single step solvent-free route via thermal decomposition of zinc acetate dihydrate and thiourea in air atmosphere. The third-order optical nonlinearity of the prepared ZnS nanoparticles were measured by Z-scan technique using continuous wave 532-nm diode pumped Nd:YAG laser. From nonlinear optical (NLO) measurements, the prepared ZnS nanoparticles possess negative nonlinearity i.e., self-defocusing. Open aperture Z-scan measurement shows saturable absorption within the medium. These results show that the prepared ZnS nanoparticles are promising candidate for various potential applications in the field of nonlinear optics.
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Xu, Xiaojie, Linfeng Hu, Nan Gao, Shaoxiong Liu, Swelm Wageh, Ahmed A. Al-Ghamdi, Ahmed Alshahrie i Xiaosheng Fang. "Controlled Growth from ZnS Nanoparticles to ZnS-CdS Nanoparticle Hybrids with Enhanced Photoactivity". Advanced Functional Materials 25, nr 3 (11.11.2014): 445–54. http://dx.doi.org/10.1002/adfm.201403065.
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Xaba, Thokozani. "Green synthesis of ZnS nanoparticles and fabrication of ZnS–chitosan nanocomposites for the removal of Cr(vi) ion from wastewater". Green Processing and Synthesis 10, nr 1 (1.01.2021): 374–83. http://dx.doi.org/10.1515/gps-2021-0026.
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Abstract A modified homogeneous precipitation method has been used to synthesize ZnS nanoparticles. Starch and polyvinyl alcohol (PVA) were utilized as capping molecules, and later, the ZnS–PVA-capped nanoparticles were then incorporated with chitosan to form ZnS–chitosan nanocomposites for the removal of Cr(vi) ion from wastewater. The optical measurements of the synthesized ZnS nanoparticles showed the band gap which was blue-shifted when compared with the bulk ZnS material. The crystalline structures were determined by X-ray diffraction, and the crystalline sizes were estimated from the Scherer formula. XRD spectra confirmed the formation of hexagonal phase for the uncapped ZnS nanoparticles with an average crystalline size of 3.71 nm whereas the starch- and PVA-capped ZnS nanoparticles showed the formation of cubic phase structures with crystalline sizes of 3.26 and 2.88 nm. The TEM image showed spherical particles with regular morphologies and significantly narrow size distributions. The calculated average particle diameters were in good agreement with the estimated XRD result. The removal of Cr(vi) ion from wastewater was studied through the adsorption process. The effect of pH, dosage, and contact time was investigated. More than 95% of the metal ion recovery was achieved through using ZnS–chitosan nanocomposites.
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Gayou, V. L., B. Salazar-Hernández, M. Rojas-López, C. Zúñiga Islas i Jorge Antonio Ascencio. "Study of Fluorescence of Yttrium Doped Zinc Sulfide Nanoparticles". Journal of Nano Research 9 (luty 2010): 139–43. http://dx.doi.org/10.4028/www.scientific.net/jnanor.9.139.
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Doped ZnS nanocrystals have attracted attention since 1994. Previous results suggest that doped semiconductor nanocrystals form a new class of luminescent materials, which have a wide range of applications in displays, lighting, sensors and lasers. In this work we synthesized Y3+ doped ZnS nanoparticles by a chemical precipitation method. The reaction was performed with ZnSO4, Na2S, phosphates and Yttrium acetate in aqueous solution. Fluorescence (FL) studies of these nanoparticles have been carried out. FL analysis reveals that the incorporation of Yttrium and phosphates to colloidal solution of ZnS nanoparticles enhances the FL signal by 6-7 times of magnitude compared with uncapped ZnS nanoparticles.
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Asadi, Asadollah, i Arash Abdolmaleki. "Toxicity and Teratogenic Effects of Zinc Sulfide Nanoparticles on Chick Embryo and Chick Fibroblast Cell Culture". Quarterly of the Horizon of Medical Sciences 25, nr 4 (1.10.2019): 270–81. http://dx.doi.org/10.32598/hms.25.4.270.
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Aims Nanoparticles (particles with a diameter of 10-500 nm) are currently used in the cosmetics industry as well as for pharmaceuticals, diagnostic imaging, and tissue engineering. Since these nanoparticles are used in industry and drug delivery, they can also be used by pregnant women. Thus, the current study investigated the teratogenic and cytotoxic effects of Zinc Sulfide (ZnS) nanoparticles on the embryo and their fibroblastic cell culture. Methods & Materials Zinc sulfide (ZnS) nanoparticles were synthesized. Then, nanoparticles at the concentrations of 5, 10, 15, 30, and 40 mg/mL/egg were injected into the air sac of the eggs in three replicates on the third day of incubation. Next, the treated and control eggs, on day 19 of incubation were opened, and embryos were weighted, and the relevant mortality rate was recorded. Fibroblast cells were isolated, cultured, and treated from the control embryo, and morphological changes and cell survival percentages were recorded. Findings The obtained results revealed that the embryos’ survival rate depends on the nanoparticle concentration. As a result, at the highest concentration, only 36.32% of the embryos survived, and the lethal dose 50% (LD50) was equal to 32.47 mg/egg. Morphological study of the treated embryos club foot and skeletal staining suggested the deletion of caudal vertebrate. The cytotoxicity study results of ZnS nanoparticles on fibroblastic cells indicated the survival fractions of 88.45%, 68.75%, and 49.32%, respectively, and its IC50 value was measured aas1460 μM. Conclusion The present study results suggested that ZnS nanoparticles had no significant toxic effects on the embryos and culture of chicken fibroblastic cells at low concentrations.
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Huang, Hua, Hai Hu Yu, Ling De Zhou, Er Dan Gu i De Sheng Jiang. "Preparation and Characterization of Hybrid Graphene-ZnS Nanoparticles". Materials Science Forum 663-665 (listopad 2010): 894–97. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.894.
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Hybrid Graphene-ZnS nanopaticles (G-ZnS NPs) were prepared by using a solvothermal method. A dispersion of graphite oxide (GO) and zinc acetate dihydrate (Zn(CH3COO)2.2H2O) in dimethl sulfoxide (DMSO) reacted at 180 °C for 12 h in a Telfon-lined stainless steel autoclave. In the reaction, DMSO serves as a sulphide source as well as a reducing agent, resulting formation of the hybrid G-ZnS NPs in one-step. Hybrid G-ZnS NPs were characterized by using a powder X-ray diffractometer, a Fourier-transform infrared spectrometer, a transmission electron microscope, a UV-vis spectrophotometer and a fluorescence spectrophotometer, respectively. In the FTIR spectra, the GO related stretching bands of C-O and carboxyl groups are not observed in the spectra of G-ZnS, suggesting that the GO sheets were reduced to graphene sheets. In the TEM images, it is observed that the ZnS nanoparticles with an average size of 23 nm are attached onto the graphene sheets. The UV-vis absorption spectrum of the G-ZnS NPs dispersed in ethanol has an absorption peak of G at 261 nm and a weak shoulder of ZnS NPs around 320 nm. The broadening and weakening of the peak of ZnS NPs at 320 nm arises from the interparticle coupling effect. Under excitation at 225 nm, a peak around 386 nm and other weaker bands appear in the fluorescence spectrum of the G-ZnS. The band at 386 nm is attributed to zinc vacancies.
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Amaranatha Reddy, D., G. Murali, N. Madhusudhana Rao, R. P. Vijayalakshmi i B. K. Reddy. "Synthesis and Optical Properties of Annealed Cr Doped ZnS Nanoparticles". Advanced Materials Research 678 (marzec 2013): 163–67. http://dx.doi.org/10.4028/www.scientific.net/amr.678.163.
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Undoped and Cr doped ZnS nanoparticles with Cr concentrations of 3.0 at.% were prepared by a chemical co-precipitation method for the fist time, using 2-Mercaptoethanol as the capping agent and annealed the synthesized particles at 600°C for 3h in air. The effect of annealing on morphological, structural and optical properties of ZnS and ZnS:Cr have been studied and compared with as prepared samples. EDAX measurements confirmed the presence of Cr in the ZnS lattice and it also confirms the conversion of ZnS into ZnO after annealed at 600 0C/3h. Surface morphologies of all samples were characterized using scanning electron microscopy (SEM). XRD spectra of as synthesized nanoparticles of ZnS and ZnS:Cr exhibited cubic phase. After annealing, the cubic phase is transformed into hexagonal phase. The particle sizes of the ZnS:Cr powders were increased from 5 to 30 nm when the powders were annealed at 600°C. A stable blue emission peak at 445 nm is observed from the as prepared samples (pure ZnS and Cr doped ZnS) but annealed at 600 0C the PL peaked at 500 nm for pure ZnS and Cr doped ZnS nanoparticles exhibited PL peak at 500 nm as well as 654 nm. The emission intensity decreased in annealed particles compared to as synthesized samples.
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Praus, Petr, Richard Dvorský, Petr Kovář i Ladislav Svoboda. "Agglomeration of ZnS nanoparticles without capping additives at different temperatures". Open Chemistry 12, nr 3 (1.03.2014): 312–17. http://dx.doi.org/10.2478/s11532-013-0385-2.
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AbstractZnS nanoparticles were precipitated in diluted aqueous solutions of zinc and sulphide ions without capping additives at a temperature interval of 0.5–20°C. ZnS nanoparticles were arranged in large flocs that were disaggregated into smaller agglomerates with hydrodynamic sizes of 70–150 nm depending on temperature. A linear relationship between hydrodynamic radius (R a) and temperature (T) was theoretically derived as R a =652 - 2.11 T.The radii of 1.9–2.2 nm of individual ZnS nanoparticles were calculated on the basis of gap energies estimated from their UV absorption spectra. Low zeta potentials of these dispersions of −5.0 mV to −6.3 mV did not depend on temperature. Interactions between individual ZnS nanoparticles were modelled in the Material Studio environment. Water molecules were found to stabilize ZnS nanoparticles via electrostatic interactions.
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Naughton, Matt S., Vivek Kumar, Yolanda Bonita, Kishori Deshpande i Paul J. A. Kenis. "High temperature continuous flow synthesis of CdSe/CdS/ZnS, CdS/ZnS, and CdSeS/ZnS nanocrystals". Nanoscale 7, nr 38 (2015): 15895–903. http://dx.doi.org/10.1039/c5nr04510j.
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S, Farhat Afsar, Chandra Prabha MN, Hari Krishna Rajan i Bhargavi Vadappi. "Synthesis, Characterization of Nano Zinc Sulphide and Evaluation of DNA Binding Interactions". ECS Transactions 107, nr 1 (24.04.2022): 15999–6007. http://dx.doi.org/10.1149/10701.15999ecst.
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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.
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Gayou, V. L., B. Salazar Hernández, R. Delgado Macuil, G. Zavala, P. Santiago i A. I. Oliva. "Structural Studies of ZnS Nanoparticles by High Resolution Transmission Electron Microscopy". Journal of Nano Research 9 (luty 2010): 125–32. http://dx.doi.org/10.4028/www.scientific.net/jnanor.9.125.
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Zinc sulfide (ZnS), a representative of wide band gap semiconductor nanocrystals, has an excitonic Bohr radius (aBZnS ) of 2.5 nm. It makes ZnS nanoparticles (ZnS NP) having such size very interesting as small biomolecular probes for fluorescence and laser scanning microscopy. To date, ZnS NP of diameters larger than aBZnS has been subject of extensive experimental and theoretical studies. However many questions remain open concerning the synthesis of undoped and uncapped ZnS NP of diameters less than 2.5 nm. To further probe into the physical properties of undoped and uncapped ZnS NP, in this work we report on studies of uncapped ZnS nanoparticles synthesized by a wet chemical process at room temperature. Three colloidal suspensions (named A, B and C, respectively) were obtained from 9:1, 1:1 and 1:9 volume mixtures of 1mM ZnSO4 and 0.85mM Na2S aqueous solutions. Qualitative differences in UV-Vis absorption spectra are discussed in the context of Z-contrast scanning transmission electron microscopy (Z-contrast), low and high resolution transmission electron microscopy (TEM) results. Distribution of particle size is dependent on different volumes of source solutions. For the intermediate mixture, it has been found that about 78% of ZnS nanoparticles have a diameter smaller than the excitonic Bohr Radius of 2.5 nm. HRTEM studies have revealed that nanoparticles grow preferentially with hexagonal structure.
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Wu, Hongya, Ruoshan Zhou, Liang Xu, Guoqiang Qin, Shengjian Qin, Gang Yu, Zhigang Yang, Guanglei Zhang i Ji Zhou. "ZnS nanoparticles-based tunable dielectric metamaterials". Modern Physics Letters B 33, nr 12 (30.04.2019): 1950142. http://dx.doi.org/10.1142/s0217984919501422.
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In recent years, increasing attention has been paid to Mie resonance-based dielectric metamaterials. Here, we report a ZnS nanoparticles-based dielectric metamaterials. The permittivity of ground state and excited state of ZnS were calculated by Materials Studio, and the obtained permittivity was used to simulate the light transmission characteristics of ZnS nanoparticles-based Mie metamaterials. ZnS nanoparticles were prepared by solid reaction process, which were dispersed into alcohol solution to get Mie resonance-based metamaterials. The transmission characteristics were measured by UV–Vis spectrophotometer. There is resonance peak both in simulation and experiment and the different electromagnetic response in ground state and excited state indicates that tunable Mie resonance-based metamaterials were fabricated. This work demonstrates the feasibility of fabrication of tunable dielectric metamaterials at optics frequencies which can be used as sensors with chemical methods.
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Lin Foo, Evon Y., i Sabar Derita Hutagalung. "Crystallite Size of Chitosan Capped Zinc Sulfide Nanoparticles Synthesized via Wet Chemical Route". Advanced Materials Research 173 (grudzień 2010): 161–66. http://dx.doi.org/10.4028/www.scientific.net/amr.173.161.
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The effect of chitosan as a capping agent on the synthesis of ZnS nanoparticles via wet chemical route was studied. The used of chitosan as a capping agent for ZnS nanoparticles had allow the synthesis to be carried out in water which is a more simple and environmental friendly. In dilute acetic acid, the amines in the chitosan will protonated to become NH3+ ions. The positive charges around the ZnS nanoparticles are then used to disperse the nanoparticles via electrostatic repulsion. Chitosan also has an effect on the size of produced nanoparticles. From the X-ray analysis found that the crystallite size of nanoparticles decreases with the increasing of the chitosan concentration. The increase in chitosan concentration will promote the growth of the nanoparticles and subsequently produced smaller nanoparticles.
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Xin, Yi, Zijiang Jiang, Wenwen Li, Zonghao Huang i Cheng Wang. "Preparation and characterization of in situ electrospun ZnS nanoparticles/PPV nanofibers". Pigment & Resin Technology 44, nr 2 (2.03.2015): 74–78. http://dx.doi.org/10.1108/prt-09-2013-0084.
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Purpose – This paper aimed to prepare a kind of ZnS nanoparticles/poly(phenylene vinylene) (PPV) nanofibre and investigate its properties. Because the ZnS nanoparticles are important optoelectronic materials, their incorporation into one-dimensional (1D) nanoscale polymer matrices should be a meaningful subject for electrospinning. Design/methodology/approach – ZnS/PPV composite nanofibres with an average diameter of 600 nm were successfully prepared by a combination of the in situ method and electrospinning technique. The nanofibres were electrospun from Zn(CH3COO)2·2H2O and PPV precursor composite solution, and the ZnS/PPV fibres were obtained by exposure of the electrospun fibres to H2S gas to prepare ZnS nanoparticles in situ. Such fibres were characterised using X-ray Diffraction (XRD), Fourier transform infrared, transmission electron microscope (TEM), scanning electron microscope and photoluminescence (PL). The photoelectric properties of the fibres obtained were also investigated. Findings – XRD patterns proved that ZnS nanocrystals generated in the composite nanofibres. The TEM image showed that the nanocrystals were homogeneously dispersed in the nanofibres. The PL spectrum of ZnS/PPV composite nanofibres exhibited a blue shift relative to the PPV nanofibres. I-V curve of the single nanofibre device under 5.76 mW/cm2 light illumination showed that the composite nanofibres have good photoelectric properties. Research limitations/implications – The comparisons of advantages between ZnS/PPV nanofibres with similar nanofibres will be further expanded in a later research. Practical implications – Results demonstrate the promise of these novel nanostructures as ultraminiature photodetectors with the potential for integration into future hybrid nanophotonic devices and systems. Originality/value – The integration of inorganic semiconductor nanoparticles into organic conjugated polymers leads to composite materials with unique physical properties and important application potential. In this work, ZnS nanoparticles were introduced into PPV by an in situ method, so as to obtain a kind of novel 1D nanomaterials with good photoelectric properties.
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Rose, M. M., R. S. Christy, T. A. Benitta, J. T. T. Kumaran i M. R. Bindhu. "Phase transition in ZnS nanoparticles: electrical, thermal, structural, optical, morphological, antibacterial and photocatalytic properties". Chalcogenide Letters 19, nr 11 (30.11.2022): 855–69. http://dx.doi.org/10.15251/cl.2022.1911.855.
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Zinc Sulphide nanoparticles (ZnS-NPs) are synthesized by microwave assisted chemical precipitation method. The as-synthesized nanoparticles are identified by X ray diffraction and electrical studies to examine the structural transition. The HT-XRD at 1000 C (373 K) and 2000 C (473 K) of ZnS-NPs also confirms structural transition of cubic to hexagonal phase. Thermal properties of the ZnS sample is also studied using thermo gravimetricdifferential thermal analysis (TG-DTA). From D.C. electrical resistance, a discontinuity occurs in the temperature resistance curve of the ZnS-NPs due to phase transition around 450 K. The energy dispersed x-ray analysis and Raman spectra of the ZnS-NPs confirm the presence of zinc and sulphur. The optical studies of the prepared ZnS-NPs are confirmed by its UV-vis and PL spectra. The TEM image of cubic ZnS-NPs reveals the well distribution of spherical shaped particles with mean size of 12.52 nm with standard deviation of 9.326 nm. According to the photocatalytic results of ZnS-NPs for the degradation of methylene blue (MB) have the highest degradation efficiency of 93.24% under UV irradiation within 80 min. Antibacterial effects of ZnS-NPs nanoparticles against some pathogens, like gram-negative, gram-positive, E. coli (Escherichia coli), S. aureus (Staphylococcus aureus) bacteria.
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Sliusariak, T. K., Y. M. Andriichuk, S. A. Vojtovych, M. A. Zhukovskyi i Y. B. Khalavka. "Synthesis of CdSe/ZnS Nanoparticles with Multiple Photoluminescence". Фізика і хімія твердого тіла 21, nr 1 (29.03.2020): 105–12. http://dx.doi.org/10.15330/pcss.21.1.105-112.
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The CdSе/ZnS nanostructures of Core-Shell type, that have multi-wave emission, are described and a scheme of possible energy transitions in the studied system is presented. CdSe nuclei were synthesized by mixing cadmium and selenium precursors without creating an inert atmosphere. The cadmium complex with sulphanilamide was used as a cadmium precursor and simultaneously as a stabilizing ligand. To grow the shell, zinc stearate and thiourea were gradually added to the solution of cadmium selenide nuclei in octadecene at 200°C. TEM studies show that the obtained CdSe/ZnS nanoparticles have the shape close to tetrahedral with an effective diameter up to 10 nm. The thickness of the ZnS shell is about 3-4 nm. From the absorption spectra of the CdSe/ZnS nanoparticles, it is clear that the shell growth leads to a sharp increase in the absorption in the short wavelentgh area, which means the formation of a wide gap ZnS material. The obtained CdSe/ZnS nanostructures emit three fluorescence peaks in the visible range. They are attributed to exciton transitions in the nucleus, recombination at defects of the boundary between the core and the shell, and recombination at defects of the shell. Such property provides CdSe/ZnS nanocrystals with a wide range of functionalities.
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Zhang, Ke Jie, Yu Ping Tong, Xiao Heng Liu i Xin Wang. "Sputtering Phenomena of ZnS Nanoparticles with Graphite Sheaths by Impacting of High-Energy Electron in a Transmission Electron Microscope". Advanced Materials Research 194-196 (luty 2011): 576–80. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.576.
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This paper presents an interesting sputtering phenomenon when high-energy beams irradiated ZnS nanoparticles with graphite sheaths in a transmission electron microscope (TEM). Sputtered nanoparticles were spherical and well dispersed on the copper grids. Results of high-resolution TEM and X-ray diffraction showed that sputtered particles were ZnS nanoparticles. The sizes of deposited ZnS nanoparticles appeared a good gradient distribution according to their distance away from the sputtering target. These nanoparticles had gradual changes in diameter from about 0.5 to 12 nm. We also discussed the mechanism of this sputtering phenomenon. This research may afford a simple and efficient method to prepare well-dispersed semiconductor nanocrystals in a small size range.
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Singh, Beer Pal, Ravish Kumar Upadhyay, Rakesh Kumar, Kamna Yadav i Hector I. Areizaga-Martinez. "Infrared Radiation Assisted Stokes’ Law Based Synthesis and Optical Characterization of ZnS Nanoparticles". Advances in Optical Technologies 2016 (21.02.2016): 1–6. http://dx.doi.org/10.1155/2016/8230291.
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The strategy and technique exploited in the synthesis of nanostructure materials have an explicit effect on the nucleation, growth, and properties of product materials. Nanoparticles of zinc sulfide (ZnS) have been synthesized by new infrared radiation (IR) assisted and Stokes’ law based controlled bottom-up approach without using any capping agent and stirring. IR has been used for heating the reaction surface designed in accordance with the well-known Stokes law for a free body falling in a quiescent fluid for the synthesis of ZnS nanoparticles. The desired concentration of aqueous solutions of zinc nitrate (Zn(NO3)2·4H2O) and thioacetamide (CH3CSNH2) was reacted in a controlled manner by IR radiation heating at the reaction area (top layer of reactants solution) of the solution which results in the formation of ZnS nanoparticles at ambient conditions following Stokes’ law for a free body falling in a quiescent fluid. The phase, crystal structure, and particle size of as-synthesized nanoparticles were studied by X-ray diffraction (XRD). The optical properties of as-synthesized ZnS nanoparticles were studied by means of optical absorption spectroscopic measurements. The optical energy band gap and the nature of transition have been studied using the well-known Tauc relation with the help of absorption spectra of as-synthesized ZnS nanoparticles.
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Archana, L. S., i Deepthi N. Rajendran. "Structural and Optical Properties of Ce3+ Doped ZnS Nanoparticles". Advanced Science Letters 24, nr 8 (1.08.2018): 5994–99. http://dx.doi.org/10.1166/asl.2018.12233.
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ZnS nanoparticles doped with various concentration of Cerium were synthesized by solid state reaction method. The presence of Ce3+ ions in the synthesized samples were verified using X-ray powder diffraction and energy-dispersive X-ray spectrum. XRD analysis showed that sample prepared were hexagonal zinc sulphide with particles’ size in the ranges 36 nm–45 nm. The crystallite size of the particles increases with Ce3+ doping. UV-Vis absorption spectroscopy measurements have shown that the strongest absorption peak of nano ZnS is blue shifted compared to bulk ZnS. The strongest absorption peak of Ce3+ doped nano ZnS is red shifted with respect to parent nano ZnS. The existence of functional groups was identified using Fourier transform infrared spectrometer. The PL emission studies of Ce3+ doped ZnS revealed good emission at 422 nm and 459 nm when excited with wavelength 290 nm.
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Qin, YL, WW Zhao, Z. Sun, XY Liu, GL Shi, ZY Liu, DR Ni i ZY Ma. "Photocatalytic and adsorption property of ZnS–TiO2/RGO ternary composites for methylene blue degradation". Adsorption Science & Technology 37, nr 9-10 (12.11.2018): 764–76. http://dx.doi.org/10.1177/0263617418810932.
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The visible light–driven ZnS–TiO2/RGO nanocomposites, with good visible light–driven photocatalytic activity, utilizing graphene oxide as precursor, were successfully synthesized via a facile solvothermal thermal method with graphene oxide as precursor. Ti4+ ions were derived from titanium dioxide powder (TiO2, P25) and tetrabutyl titanate. S2− ions and Zn2+ ions were provided by sodium sulfide and zinc acetate, respectively. The photocatalytic and absorbance activity of the nanocomposites was investigated through the photocatalytic degradation of methylene blue in aqueous solution. The results showed that the ZnS–TiO2/RGO nanocomposite prepared by tetrabutyl titanate exhibited better photocatalytic and adsorbance activity for methylene blue under visible light irradiation and its photocatalytic efficiency reached 90% in 60-min light irradiation, almost 1.5 times that of the synthesized ZnS–TiO2/RGO by P25, which was attributed to a cooperative reaction because of an increase of photo-absorption effect of graphene sheets and photocatalytic effect of ZnS nanoparticles. The adsorbance activity for ZnS–TiO2/RGO–tetrabutyl titanate) reached 48%, which was almost 1.7 times higher than that of ZnS–TiO2/RGO-P25 and almost 3.7 times higher than that of ZnS/RGO.
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Sreenivasulu, B., S. Venkatramana Reddy i P. Venkateswara Reddy. "Structural, Optical and Magnetic Properties of Ni Doped ZnS Nanoparticles". Advanced Science Letters 24, nr 8 (1.08.2018): 5640–44. http://dx.doi.org/10.1166/asl.2018.12167.
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Pure ZnS and 3 mol% of Ni doped ZnS nano powders are prepared by chemical co-precipitation method. Properties of ZnS: Ni2+ nanoparticles are studied by X-ray diffraction Spectra (XRD), Raman spectroscopy (RS), Photoluminescence (PL), Absorption Spectra, Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDAX), Transmission electron microscopy (TEM) and Vibrating sample magnetometer (VSM). From XRD data, it conform the structure of ZnS, and particle size of pure and Ni doped ZnS data indicates the incorporation of Ni2+ in ZnS nanocrystal lattice. Raman spectra for pure and Ni doped samples exhibited vibrational modes confirm the structure of ZnS. Photoluminescence spectra reveal that the emission peaks are in UV and visible regions; this is confirming the absorption spectra. SEM micrographs show spherical morphology, and chemical compositions of samples are in stoichiometric proportions. TEM micro graphs show the spherical surface morphology and average particle size for pure and Ni2+ doped nanoparticles are in the range of 2–3 nm, this is good agreement with XRD results. M–H curves from VSM show room temperature ferromagnetism.
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Vafayi, Leila, i Soodabe Gharibe. "Investigation of In Vitro Drug Release from Porous Hollow Silica Nanospheres Prepared of ZnS@SiO2Core-Shell". Bioinorganic Chemistry and Applications 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/541030.
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In this contribution, porous hollow silica nanoparticles using inorganic nanosized ZnS as a template were prepared. The hydrothermal method was used to synthesize pure ZnS nanospheres material. The ZnS@SiO2core-shell nanocomposites were prepared using a simple sol-gel method successfully. The hollow silica nanostructures were achieved by selective removal of the ZnS core. The morphology, structure, and composition of the product were determined using powder X-ray diffraction (XRD), emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). The results demonstrated clearly that the pure ZnS nanoparticles are in a spherical form with the average size of 40 nm and correspond with zinc blend structure. The porous hollow silica nanoparticles obtained were exploited as drug carriers to investigate in vitro release behavior of amoxicillin in simulated body fluid (SBF). UV-visible spectrometry was carried out to determine the amount of amoxicillin entrapped in the carrier. Amoxicillin release profile from porous hollow silica nanoparticles followed a three-stage pattern and indicated a delayed release effect.