Artykuły w czasopismach: „Fe-doped zinc oxide nanoparticles”

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Hussain, Mohammad Musarraf, Abdullah M. Asiri i Mohammed M. Rahman. "Simultaneous detection of l-aspartic acid and glycine using wet-chemically prepared Fe3O4@ZnO nanoparticles: real sample analysis". RSC Advances 10, nr 33 (2020): 19276–89. http://dx.doi.org/10.1039/d0ra03263h.

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Rajić, Vladimir, Ivana Stojković Simatović, Ljiljana Veselinović, Jelena Belošević Čavor, Mirjana Novaković, Maja Popović, Srečo Davor Škapin i in. "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry". Physical Chemistry Chemical Physics 22, nr 38 (2020): 22078–95. http://dx.doi.org/10.1039/d0cp03377d.

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Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn_1−xFe_xO, x = 0, 0.05, 0.1, 0.15 and 0.20) nanoparticles, which were tested as catalysts toward the ORR and OER in a moderately alkaline solution.

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Mahmoud, A. Z., E. M. M. Ibrahim, Lamiaa Galal, E. R. Shaaban i E. S. Yousef. "Structural, optical and magnetic characteristics of iron doped zinc oxide thin films". Journal of Ovonic Research 19, nr 3 (1.05.2023): 239–51. http://dx.doi.org/10.15251/jor.2023.193.239.

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Zn1-xFexO films with x = 0, 5, 10, 15 and 20 at.% were prepared under high vacuum by the electron beam gun evaporation. The impact of Fe doping concentration on the films' structural, optical and magnetic characteristics has been taken into account. The patterns of XRD for all films at various Fe concentrations showed wurtzite-type structures. The results show that the size of nano-films reduces from 24 nm (0%) to 11 nm (0.20%) with elevating Fe content, which is owing to the difference between the ionic radii of Zn and Fe. Peaks associated with the elements to be seen were visible in the XPS spectra of undoped and 10% Fe-doped ZnO nanoparticles produced by the precipitation process: zinc (Zn), iron (Fe), and oxygen (O). The optical constants (n, k) of the Zn1-xFexO films were obtained by the SE measurements by an ellipsometric model, allowing for the verification of the Fe3+ ions in Fe-doped ZnO. With the addition of Fe, the energy band gap decreased from 3.44 eV to 3.28 eV. M-H measurements revealed room-temperature ferromagnetism in Fe-doped ZnO thin film. As the Fe concentration rises, the magnetization increases until it reaches a concentration of 15%, at which point it starts to decrease. This decrease in magnetization was attributable to the spinel phase, which was seen in the XRD spectra. These findings imply that Fe-doped ZnO is a highly suggested material for the creation of spintronic and optoelectronic devices.

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Karavasilis, M. V., M. A. Theodoropoulou i C. D. Tsakiroglou. "A comparative study of the performance of zinc oxide and iron oxide doped-zinc oxide photocatalysts toward the oxidization of phenol under UV-radiation and sunlight". IOP Conference Series: Earth and Environmental Science 899, nr 1 (1.11.2021): 012069. http://dx.doi.org/10.1088/1755-1315/899/1/012069.

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Abstract In the present work, a comparative analysis of the photocatalytic degradation of phenol, was done for two different types of immobilized photocatalytic nanoparticles immobilized on 5mm sodalime beads by a facile and cost-effective method: (1) Zinc oxide (ZnO) and (2) Iron doped Zinc Oxide (Fe-ZnO). Tests of phenol degradation by using the immobilized catalyst were conducted in batch photoreactors under UVA light of 22W and summertime sunlight. These tests allowed us to evaluate the phenol degradation rate and photocatalyst durability under controlled conditions.

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Mușat, Viorica, Mariana Ibănescu, Dana Tutunaru i Florentina Potecaşu. "Fe-Doped ZnO Nanoparticles: Structural, Morphological, Antimicrobial and Photocatalytic Characterization". Advanced Materials Research 1143 (luty 2017): 233–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1143.233.

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Oxide semiconductors have attracted increasing interest due to their potential in solving environmental problems. ZnO-based nanoparticles (NPs) are among the most investigated for efficient disinfection and microbial control.Iron-doped zinc oxide nanoparticles (Fe:ZnO NPs) were successfully fabricated through precipitation method at low temperature followed by thermal treatment. The obtained Fe:ZnO NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible (UV–Vis) spectroscopy. The effect of iron content on structural, morphological, antimicrobial and photocatalytic properties was investigated and discussed.The photocatalytic activity of the nanoparticles was tested by degradation of methylene blue (MB) solution under UV light for 60 min irradiation. The antibacterial activity was determined by paper disc method on Mueller-Hinton agar against the Gram-negative bacteria Escherichia coli (E. coli) and the Gram-positive bacteria Staphylococcus aureus (S. aureus) and compared to that of the undoped ZnO NPs. Consistent improvement on the photocatalytic and antimicrobial activity of Fe-doped ZnO nanoparticles was noticed.

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Chun, Se Min, Dae Hyun Choi, Jong Bae Park i Yong Cheol Hong. "Optical and Structural Properties of ZnO Nanoparticles Synthesized by CO2 Microwave Plasma at Atmospheric Pressure". Journal of Nanoparticles 2014 (23.06.2014): 1–7. http://dx.doi.org/10.1155/2014/734256.

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The results of carbon-doped zinc oxide nanoparticles synthesized by CO2 microwave plasma at atmospheric pressure are presented. The 2.45-GHz microwave plasma torch and feeder for injecting Zn granules are used in the synthesis of zinc oxide nanoparticles. The Zn granules (13.5 g/min) were introduced into the microwave plasma by CO2 (5 l/min) swirl gas. The microwave power delivered to the CO2 microwave plasma was 1 kW. The synthesis of carbon-doped zinc oxide nanoparticles was carried out in accordance with CO2 + Zn → carbon-doped ZnO + CO. The synthesized carbon-doped zinc oxide nanoparticles have a high purity hexagonal phase. The absorption edge of carbon-doped zinc oxide nanoparticles exhibited a red shift from a high-energy wavelength to lower in the UV-visible spectrum, due to band gap narrowing. A UV-NIR spectrometer, X-ray diffraction, emission scanning electron-microscopy, energy dispersive X-ray microanalysis, Fourier transform infrared spectroscopy, and a UV-Vis-NIR spectrophotometer were used for the characterization of the as-produced products.

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Rehman, Abdul, Nakash Rizvi i Muhammad Tahir Khan. "To Study the Structural, Optical and Magnetic Properties of Ni-Fe Doped ZnO Diluted Magnetic Semiconductors". NUST Journal of Engineering Sciences 15, nr 1 (30.06.2022): 12–17. http://dx.doi.org/10.24949/njes.v15i1.678.

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The iron and Nickel co-doped in zinc oxide nano-particle, Zn1-x-yFexNiyO {(x=0, y=0), (x=0.05, y=0), (x=0, y=0.05), (x=0.03, y=0.02)} were prepared by Sol-Gel technique. This type of synthesis is used for the manufacture of a Field Effect Transistor (FET) detector which is extremely sensitive, secure, and capable of reproducing. It is also used for the detection of the Piperidine (CH2)5NH (hexahydro pyridone) chemical. The well-closed pack spherical nano-particles of the identified crystalline structure of the usual wurtzite hexagonal phase were achieved by characterization of X-Ray Diffraction (XRD). The blue shift was well observed of Co-doped samples as compared to un-doped or single-doped ZnO nanoparticle samples by UV-visible absorption spectrum. The Fourier Transform Infrared Spectroscopy (FTIR) reveals the existence of chemical bonding and functional groups are established and the occurrence of iron Fe in modes associated with iron Fe in addition to ZnO. The room temperature ferromagnetism was achieved in single or co-doped (Fe-Ni) with ZnO nanoparticles and is confirmed by magnetic characterization (VSM). It was perceived that magnetic saturation was improved in Fe-Ni Co-doped samples relative to pure or single doped. Also, the characterizations of samples show that the exchange interaction of Ni and Fe dominates over Ni-Ni and Fe-Fe interactions.

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Asma, F., W. Prasetyo, Priyono i I. Nurhasanah. "Synthesize of Cerium-doped ZnO nanoparticles as antioxidant agent". Journal of Physics: Conference Series 2190, nr 1 (1.03.2022): 012045. http://dx.doi.org/10.1088/1742-6596/2190/1/012045.

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Abstract Zinc oxide nanoparticles are potential metal oxide for antioxidant agent. This paper investigates antioxidant activity of cerium-doped zinc oxide (Ce-doped ZnO) nanoparticles. Ce-doped ZnO nanoparticles was prepared by precipitation method with calcination temperature of 200˚C. The product of precipitate was characterized by X-ray diffraction measurement, and UV-Vis spectrophotometer. The antioxidant activity of Ce-doped ZnO nanoparticles was investigated using 1,1-diphenyl-2-pcrylhydrazyl (DPPH) method. The X-ray diffraction pattern showed the growth of Ce-doped ZnO crystalline structure of hexagonal wurtzite with crystallite size of 42 nm. UV-Vis absorbance spectrum analysis revealed the band gap energy of Ce-doped ZnO nanoparticles was smaller than band gap energy of bulk ZnO. Ce-doped ZnO nanoparticles could scavenge DPPH free radicals and exhibited moderate antioxidant activity.

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Sohn, Hong Yong, i Arun Murali. "Plasma Synthesis of Advanced Metal Oxide Nanoparticles and Their Applications as Transparent Conducting Oxide Thin Films". Molecules 26, nr 5 (7.03.2021): 1456. http://dx.doi.org/10.3390/molecules26051456.

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This article reviews and summarizes work recently performed in this laboratory on the synthesis of advanced transparent conducting oxide nanopowders by the use of plasma. The nanopowders thus synthesized include indium tin oxide (ITO), zinc oxide (ZnO) and tin-doped zinc oxide (TZO), aluminum-doped zinc oxide (AZO), and indium-doped zinc oxide (IZO). These oxides have excellent transparent conducting properties, among other useful characteristics. ZnO and TZO also has photocatalytic properties. The synthesis of these materials started with the selection of the suitable precursors, which were injected into a non-transferred thermal plasma and vaporized followed by vapor-phase reactions to form nanosized oxide particles. The products were analyzed by the use of various advanced instrumental analysis techniques, and their useful properties were tested by different appropriate methods. The thermal plasma process showed a considerable potential as an efficient technique for synthesizing oxide nanopowders. This process is also suitable for large scale production of nano-sized powders owing to the availability of high temperatures for volatilizing reactants rapidly, followed by vapor phase reactions and rapid quenching to yield nano-sized powder.

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Amutha, A. "Structural and FTIR Studies of Pure and Zinc Doped SNO2NanoParticles". Advances in Materials Science and Engineering: An International Journal (MSEJ) 9, nr 3 (30.09.2022): 1–8. http://dx.doi.org/10.5121/msej.2022.9301.

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Pure and zinc-doped tin oxide nanoparticles were synthesized by the chemical co-precipitation method. The structural studies were carried out by X-Ray Diffraction pattern. XRD pattern reveals the tetragonal rutile structure of tin oxide nanoparticles. Fourier Transform Infrared Spectroscopy studies were used to identify the chemical information of pure and zinc-doped tin oxide nanoparticles. The crystallite size of pure tin oxide nanoparticles is 9 nm obtained from the X-ray diffraction pattern. The Zn ions are incorporated into the tin ions. It is suitable candidate for gas sensor applications.

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Swapna, Peyyala, i Sakirevupalli Venkatramana Reddy. "Structural, Optical & Magnetic Properties of (Fe, Al) Co-Doped Zinc Oxide Nanoparticles". Nanoscale Reports 2, nr 1 (28.02.2019): 3–16. http://dx.doi.org/10.26524/nr1912.

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Pure and (Fe, Al) co-doped ZnO nanopowders are prepared via co-precipitation method constructively with PEG as capping agent at room temperature (RT). We kept the aluminum concentration as constant at 5 mol% by altering the iron concentration from one to three mol%. After the finishing point of synthesis, the powders are cautiously subjected to various characterizations for instance XRD, Raman, SEM through EDS, TEM, PL, UV-Vis-NIR and VSM, to analyze the properties of structural, morphological, optical and magnetic. XRD analysis reveals, all the nanopowder samples acquire hexagonal wurtzite structure by the nonexistence of secondary peaks involving to aluminum or iron. This reveals the well dissolving of aluminum and iron in to Zinc Oxide host lattice. The literal size of nanocrystallites is evaluated through TEM pictures, which are approximately corroborated by the XRD calculations. The nanostructures morphology is found through SEM illustrations, and the spectrum of EDS shows that no impurities are existence other than iron and aluminum. Optical properties are deliberated by the PL spectrum and UV-Vis-NIR spectrum; all the powder samples encompass defect associated peaks over the visible range. Magnetic properties are evaluated using VSM and all the co-doped samples contain the Ferromagnetic nature except pristine Zinc Oxide.

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Roy, Anirban, Sampa Chakrabarti i Saikat Maitra. "SIMULTANEOUS SOLAR PHOTO-DEGRADATION OF PVC-FE-DOPED ZNO-NANOCOMPOSITE FLAKES AND METHYLENE BLUE DYE IN WATER". Journal of Environmental Engineering and Landscape Management 30, nr 2 (25.05.2022): 268–75. http://dx.doi.org/10.3846/jeelm.2022.16743.

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Simultaneous solar photocatalytic decolorization of Methlene Blue (MB) dye and degradation of polymer nanocomposite film in water has been attempted in the present work. The film immobilized iron (Fe)-doped zinc oxide (ZnO) nanoparticles (NPs) in polyvinyl chloride (PVC) matrix. This reduced the cost of separation of nanoparticles from treated water. Doped NPs were prepared sonochemically using zinc acetylacetonate (0.95 mmol) and ferric acetylacetonate (0.05 mmol) precursors in aqueous ethanol medium. XRD, UV-vis spectroscopy, FESEM and EDX were used for characterizing nanoparticles whereas the film was characterized by SEM. During the process, the film also reduced in weight. Degradation of both the dye and the polymer followed pseudo-first order kinetics. About 28% of the initial concentration of dye and about 5.04% of the initial weight of the PVC-film were decreased in the process after a run time of 3 h 45 minutes.

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Grabis, Jānis, Anita Letlena i Aija Krūmiņa. "Influence of Silver on Photocatalytic Activity of Nanosized ZnO Doped with Iron Group Metals". Solid State Phenomena 267 (październik 2017): 93–97. http://dx.doi.org/10.4028/www.scientific.net/ssp.267.93.

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Zinc oxide nanoparticles doped with 0.2–1.5 mol% of Fe, Ni or Co and co-doped with 1 mol% of Ag were prepared by co-precipitation method and their photocatalytic activity in degradation of MB (methylene blue) water solution under ultraviolet irradiation was determined. X-ray diffraction analysis of the samples containing up to 0.5 mol% of iron group metals showed only ZnO and Ag phases. Crystallite size of doped ZnO nanoparticles was in the range of 27–31.6 nm depending on the sample composition and additional calcination at 400 °C. The photocatalytic activity of ZnO doped with iron group metals depended on the content of metals. The highest activity was observed for ZnO doped with 0.2 mol% of nickel. The co-doped with silver samples showed enhanced photocatalytic activity and higher reaction rate constant.

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J. Nancy, V. Kalaiselvi, B. Blessymol, P. Yasotha, M. Vishalatchi i S. Pavithra. "Microwave Synthesis of Triethanolamine-doped Zinc Oxide Nanoparticles". Journal of Environmental Nanotechnology 11, nr 2 (30.06.2022): 22–27. http://dx.doi.org/10.13074/jent.2022.06.222454.

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In this work, Triethanolamine-doped Zinc Oxide (ZnO) nanoparticles were synthesized by chemical deposition, associated with the microwave irradiation method. The synthesized zinc oxide nanoparticles were characterized by Scanning Electron Microscope, X-Ray Diffraction, Fourier Transform Infrared Spectroscopy, Ultra Violet - visible spectroscopy, Photo Luminescence Spectroscopy and Antimicrobial Activity. The prepared sample's surface morphology, crystalline size, functional groups, absorbance and band gap, and emission wavelength were calculated. Antimicrobial activity was performed to predict the zone of inhibition of synthesized nanoparticles.

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K, Rathidevi, Velmani N i Tamilselvi D. "Electrical conductivity study of poly(p-anisidine) doped and undoped ZnO nanocomposite". Mediterranean Journal of Chemistry 9, nr 5 (14.12.2019): 403–10. http://dx.doi.org/10.13171/mjc01912071050kr.

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Polymeric blends of Poly (p-anisidine) with ZnO nanoparticles was prepared by chemical oxidative polymerization. Zinc oxide doped PPA polymer nanocomposite (ZPPA) and Magnesium doped Zinc oxide PPA polymer nanocomposite (MZPPA) were synthesized with the addition of semiconductor metal oxide to the polymeric solution. The X-ray diffraction studies of ZnO nanoparticles showed hexagonal wurzite structure. The surface morphological study also confirms the formation of hexagonal structured nanoparticles. The peak for Magnesium and Zinc in EDS spectra confirms the formation of Magnesium doped polymer nanocomposite. The addition of ZnO/MgZnO onto PPA conducting polymer showed agglomeration of semiconductor material results in spherical shaped polymer nanocomposite and irregular overlapping over the PPA polymeric surface. The electrochemical conductivity studies suggested that the doped PPA conducting polymeric blends showed enhanced conductivity nature.

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Muktaridha, O., M. Adlim, S. Suhendrayatna i I. Ismail. "Synthesis of iron-doped zinc oxide (Fe-ZnO) nanoparticles by using several stabilizers". Journal of Physics: Conference Series 1882, nr 1 (1.05.2021): 012109. http://dx.doi.org/10.1088/1742-6596/1882/1/012109.

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Wang, Kailai, i Edward P. C. Lai. "Electrochemical Sensing of Zinc Oxide and Peroxide Nanoparticles: Modification with Meso-tetrakis(4-carboxyphenyl) Porphyrin". Chemosensors 11, nr 7 (30.06.2023): 369. http://dx.doi.org/10.3390/chemosensors11070369.

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An electrochemical method was developed to investigate the redox properties of zinc oxide (ZnO), zinc peroxide (ZnO2), and sodium-doped zinc peroxide (Na-ZnO2) nanoparticles. The intention was to distinguish the identity of these nanoparticles among themselves, and from other transition metal oxide nanoparticles (TMONPs). Analysis of 3 mM sodium metabisulfite by cyclic voltammetry (CV) produced anodic/cathodic peak currents that are linearly related to the mass of deposited nanoparticles. A graphite working electrode was essential to the oxidation of metabisulfite. ZnO nanoparticles were crucial to the enhancement of metabisulfite oxidation current, and PPy coating could suppress the current enhancement by covering all nanoparticle surfaces. Furthermore, meso-tetrakis(4-carboxyphenyl) porphyrin was demonstrated to be a good chemical reagent that facilitates the differentiation of ZnO from ZnO2 and nanoparticles by CV analysis.

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Karavasilis, M. V., M. A. Theodoropoulou i C. D. Tsakiroglou. "Degradation of the persistent organic pollutant-lindane in fixed-bed photoreactor packed with immobilized Zinc Oxide and Iron oxide-doped Zinc Oxide photocatalysts". IOP Conference Series: Earth and Environmental Science 1123, nr 1 (1.12.2022): 012082. http://dx.doi.org/10.1088/1755-1315/1123/1/012082.

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Abstract The potential for the photocatalytic degradation of lindane, used as agricultural insecticide and pharmaceutical product, is investigated. Two types of photocatalysts, immobilized on 5 mm sodalime beads are synthesised using an easy and economical process: (1) Zinc Oxide (ZnO) nanoparticles and (2) Iron oxide-doped Zinc Oxide (Fe-ZnO). Tests of lindane degradation under continuous flow conditions are conducted on a stainless steel fixed bed photoreactor using a 6W UV-A lamp operating at 375 nm. The lindane sorption onto photocatalysts is examined with equilibrium and kinetic tests at batch mode. The experimental datasets are fitted with a 1-dimensional advection-dispersion-sorption-reaction numerical model to estimate the parameters controlling the lindane degradation rate: the apparent sorption capacity of the catalyst, and the surface reaction kinetic constant. Based on estimated parameter values, a comparative analysis of the performance of the two catalysts is done.

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., J. S. Mayekar. "SYNTHESIS AND CHARACTERIZATION OF PURE ZINC OXIDE NANOPARTICLES AND NICKEL DOPED ZINC OXIDE NANOPARTICLES". International Journal of Research in Engineering and Technology 04, nr 11 (25.11.2015): 104–7. http://dx.doi.org/10.15623/ijret.2015.0411019.

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Nohegar, Shadi Ashraf, Arezoo Nejaei, Ebrahim Fataei, Mohammad Ebrahim Ramezani i Parvin Alizadeh Eslami. "Evaluation of the Toxicity of Zinc Oxide Nanoparticles upon Staphylococcus Aureus and Escherichia Coliin Contaminated water". Journal of Advances in Environmental Health Research 10, nr 3 (1.07.2022): 235–46. http://dx.doi.org/10.32598/jaehr.10.3.1261.

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Background: Nanoparticles (NPs) have recently attracted extensive attention in the field of elimination and reduction of microbial load in various water resources. Accordingly, this study aimed to eliminate bacterial contamination from aqueous solutions using synthesized NPs. Methods: In the present study, zinc oxide (ZnO) and silver (Ag) ion-doped zinc oxide (Ag/ZnO, 1-6 wt%) nanoparticles were synthesized using the sol-gel process and then characterized in terms of structure, morphology, and antimicrobial activity. X-ray diffraction (XRD) was utilized to determine the nanoparticle size and crystal structure. Images from field emission-scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) confirmed the successful production of NPs. The antimicrobial activity of ZnO and Ag1-6%/ZnO against Staphylococcus aureus and Escherichia coli was assessed by the agar well diffusion method. Results: According to the findings, the synthesized ZnO had a hexagonal structure and the size of ZnO and Ag5%/ZnO were 32.56 nm and 12.81 nm, respectively; the field emission-scanning electron microscopy (FE-SEM) images showed that the nanoparticle sizes were 77.60 nm and 47.15 nm, respectively. Based on transmission electron microscopy (TEM) images, the mean size of ZnO and Ag5%/ZnO was 22.5 nm and 17.5 nm, respectively. The results showed that the diameter of the zone of inhibition created by Ag5%/ZnO at a concentration of 0.1 g/mL was 20 mm and 13 mm for S. aureus and E. coli, respectively. Conclusion: The results indicated that E. coli was more resistant than S. aureus, although E. coli was still more resistant at low concentrations.

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RATHIDEVI, K., N. VELMANI i D. TAMILSELVI. "STRUCTURAL, MORPHOLOGICAL AND OPTICAL PERFORMANCE OF SYNTHESIZED Co, Mn/ZnO NANOCOMPOSITES". Journal of Ovonic Research 16, nr 5 (wrzesień 2020): 337–43. http://dx.doi.org/10.15251/jor.2020.165.337.

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The pure Zinc Oxide, Cobalt doped Zinc Oxide and Manganese doped Zinc oxide nanoparticles were synthesized using Co-precipitation method. This work aims to study the effect of doping on the structural, morphological, and optical properties of the synthesized pure and doped ZnO nanoparticles. The structural and morphological change of the nanoparticles were examined by using X-ray Diffraction analysis (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The elemental analysis was studied with Energy Dispersive X-ray analysis (EDAX). The optical property of the particles were analysed using UV-Visible Spectroscopy (UV) and Photoluminescence Spectroscopy (PL). The XRD results shows all the nanoparticles are crystalline and pure in nature. The doping effect found to decrease the particle size of the ZnO nanoparticles. The SEM images also show the doping has significant change on the morphology of the ZnO nanoparticles. The functional groups present in the nanoparticles were confirmed using Fourier Transform Infrared Spectroscopy. The optical property of UV-Vis spectrum shows red shift and the band gap also found to decrease for doped nanoparticles. The presence of dopants in the nanoparticles was confirmed with the EDAX spectrum. The results of above characterization techniques confirmed the doping has significant influence on the structure, morphology, and optical property of the ZnO nanoparticles.

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Journal, Baghdad Science. "Fabricated of Cu Doped ZnO Nanoparticles for Solar Cell Application". Baghdad Science Journal 15, nr 2 (4.06.2018): 198–204. http://dx.doi.org/10.21123/bsj.15.2.198-204.

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Copper with different concentrations doped with zinc oxide nanoparticles were prepared from a mixture of zinc acetate and copper acetate with sodium hydroxide in aqueous solution. The structure of the prepared samples was done by X-ray diffraction, atomic force microscopy (AFM) and UV-VIS absorption spectrophotometer. Debye-Scherer formula was used to calculate the size of the prepared samples. The band gap of the nanoparticle ZnO was determined by using UV-VIS optical spectroscopy.

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Naumenko, K. S., A. I. Ievtushenko, V. A. Karpyna, O. I. Bykov i L. A. Myroniuk. "The Effect of Ag-Doping on the Cytotoxicity of ZnO Nanostructures Grown on Ag/Si Substrates by APMOCVD". Mikrobiolohichnyi Zhurnal 84, nr 2 (28.11.2022): 47–56. http://dx.doi.org/10.15407/microbiolj84.02.047.

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The search and development of new nanostructures and nanomaterials are very important for the progress of nanotechnology and modern microbiology. Due to the unique properties of silver and zinc oxide, these nanoparticles are the optimal basis for creating nanostructures with potential antiviral activity. An important issue in these studies is the establishment of cytotoxicity of these nanoparticles and their composites. Aim. To define the influence of substrate temperature and Ag concentration in ZnO lattice on the microstructure and cytotoxicity of zinc oxide nanostructures. Methods. Pure and Ag-doped ZnO nanostructures were grown on Ag/Si substrates by atmospheric pressure metalorganic chemical vapor deposition method using a mixture of zinc acetylacetonate and silver acetylacetonate powders as a precursor. Argentum thin films were deposited on Si substrates by a thermal evaporation method. MTT-assay was used for the analysis of MDBK and MDCK cell viability in the definition of zinc oxide nanostructure cytotoxicity. Results. Ag-doped zinc oxide nanostructures were grown and characterized by X-ray diff raction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. It was found that Si substrate and pure zinc oxide do not inhibit the cell viability of both epithelial cultures whereas Ag-doped ZnO nanostructures inhibit the cell viability because of all-time exposure in a sample without dilution. The cytotoxic effect was not observed at higher dilutions for Ag-doped zinc oxide nanostructures. Conclusions. The investigation of the effect of Ag-doping on the morphology and cytotoxicity of zinc oxide nanostructures is very important for implementing zinc oxide nanostructures into the current optoelectronics and photocatalysis.

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Khan, Shakeel Ahmad, Sammia Shahid, Waqas Bashir, Sadia Kanwal i Ahsan Iqbal. "Synthesis, characterization and evaluation of biological activities of manganese-doped zinc oxide nanoparticles". Tropical Journal of Pharmaceutical Research 16, nr 10 (14.11.2017): 2331–39. http://dx.doi.org/10.4314/tjpr.v16i10.4.

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Purpose: To synthesize, characterize and investigate the antimicrobial properties of pure and manganese-doped zinc oxide nanoparticles.Method: Un-doped and manganese-doped zinc oxide (Mn-doped ZnO) nanoparticles were prepared using co-precipitation method. The synthesized Mn-doped ZnO nanoparticles were characterized using energy-dispersive x-ray spectroscopy (EDX), scanning electron microscopy (SEM), and x-ray diffraction (XRD) spectroscopic techniques. Their band gap energies were measured with ultraviolet-visible (UVVis) spectroscopy, while their antioxidant properties were evaluated by ferric reducing antioxidant power (FRAP), DPPH radical-scavenging, ferric thiocyanate (FTC) and total phenolic content (TPC) assays. The antimicrobial activities of the nanoparticles against different bacterial strains were determined using agar diffusion method.Result: Results from XRD, SEM, EDX and UV-Vis analyses demonstrated successful synthesis of undoped and Mn-doped ZnO nanoparticles as seen in their hexagonal, wurtzite structures. The un-doped and Mn-doped ZnO nanoparticles had average grain sizes of 16.72 nm and 17.5 nm, and band gap energies of 3.585 eV and 2.737 eV, respectively. Significant antibacterial activity was manifested by Mndoped ZnO against E. coli, S. aureus, Klebsiella and B. subtilis, with zones of inhibition (ZOIs) of 13 ± 0.09 mm, 14 ± 0.01 mm, 18 ± 0.07 mm and 20 ± 0.10 mm, respectively. The Mn-doped ZnO nanoparticles also exhibited effective and significant antioxidant potential relative to butylated hydroxytoluene (BHT) and un-doped ZnO nanoparticles.Conclusion: Mn-doped ZnO nanoparticles demonstrate significant antimicrobial and antioxidant activities. Thus, the preparation is a good candidate for further development into therapeutic formulations.Keywords: Mn-doped ZnO, Nanoparticles, Properties, Antioxidant, Antibacterial

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HAMMAD, TALAAT M., JAMIL K. SALEM i ROGER G. HARRISON. "SYNTHESIS, CHARACTERIZATION, AND OPTICAL PROPERTIES OF Y-DOPED ZnO NANOPARTICLES". Nano 04, nr 04 (sierpień 2009): 225–32. http://dx.doi.org/10.1142/s1793292009001691.

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Zinc oxide ( ZnO ) and yttrium-doped ZnO nanoparticles with particle size in the nanometer range have been successfully synthesized by the alkali precipitation method. The nanoparticle size and morphology have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The average particle size of Y-doped ZnO nanoparticles is about 17–29 nm. The absorption and photoluminescence (PL) spectra of the undoped and doped ZnO nanoparticles were also investigated. The optical band gap of ZnO nanoparticles can be tuned from 3.27 to 3.40 eV with increasing yittrium doping levels from 0 to 5%. The nanoparticles gave two emission peaks, one at around 376 nm and the other at 500 nm.

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A, Rathika, i Irine T. M. "SYNTHESIS OF SILVER (Ag) DOPED ZINC OXIDE (ZnO) NANOPARTICLES AS EFFICIENTPHOTOCATALYTIC ACTIVITY FOR DEGRADATION METHYLENE BLUE DYE". Journal of Advanced Scientific Research 13, nr 02 (31.03.2022): 129–35. http://dx.doi.org/10.55218/jasr.202213217.

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Zinc oxide (ZnO) and silver doped zinc oxide (Ag-ZnO) nanoparticles were prepared using zinc nitrates as oxidizers, glycine and citric acid as fuels as solution combustion synthesis (SCS) at 500°C. X-ray diffraction (XRD) pattern demonstrates the presence of Ag+ in the hexagonal zincite structure of ZnO. The average crystalline size of the particles of ZnO and Ag-ZnO were found to 47 nm and 74 nm respectively. From the Fourier transform infrared (FTIR) spectrum, the composition of Ag doped ZnO confirmed Ag-Zn-O stretching vibration at 510 cm-1. The UV-Visible absorption spectra results showed that synthesized ZnO and Ag-ZnO nanoparticles exhibited UV-visible absorption peaks at 370 nm, corresponds to a band gap of 3.24 eVand 3.08 eV respectively. Based on the above characterization techniques, the incorporation of silver affects the structural and optical behaviour of ZnO nanoparticles. The ZnO nanoparticles were observed that the particles are spherical morphologies. EDAX spectrum indicates no other elemental presence in the synthesized nanoparticle. The present work illustrate the Ag-ZnO nanoparticles as a photo-catalyst to decompose contaminants in the presence of UV light. The photo-catalytic activity of ZnO samples were investigated by UV- irradiation of methylene blue solution in a photocatalytic setup. The resulting mixtures were irradiated with UV light for a period of 45 mins. Based on results, the photocatalytic activity of Ag-ZnO nanoparticles were enhanced by the addition of Ag in pure ZnO nanoparticles. Ag doped ZnO nanoparticles showed higher photocatalytic activity efficiency than pure ZnO nanoparticles.

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JAVED, M., M. A. ABID, S. HUSSAIN, D. SHAHWAR, S. ARSHAD, N. AHMAD, M. ARIF i in. "SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC APPLICATIONS OF S-DOPED GRAPHITIC CARBON NITRIDE NANOCOMPOSITES WITH NICKEL DOPED ZINC OXIDE NANOPARTICLES". Digest Journal of Nanomaterials and Biostructures 15, nr 4 (grudzień 2020): 1097–105. http://dx.doi.org/10.15251/djnb.2020.154.1097.

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Coprecipitation method was adopted for the synthesis of undoped and Ni-doped zinc oxide nanoparticles. The photocatalytic activity of the synthesized particles was examined by degradation of methylene blue under UV bulb. The S-doped graphitic carbon nitride was obtained by calcination of thiourea and composites were formed with S-doped graphitic carbon nitride and nickel doped zinc oxide nanoparticles using liquid exfoliation method. The ethanol and water were used as solvents for the liquid exfoliation. The photocatalytic activity was performed under UV and visible light by using a UV-visible spectrophotometer with different concentrations of composites for the degradation of methylene blue. The doping of nickel on zinc oxide nanoparticles and formation of sulfur doped graphitic carbon nitride composites were confirmed by FTIR and XRD analyses. The FTIR analysis sowed a signal at 838cm-1 due to the presence of Ni-O bond. The peaks at 3649cm-1 and 3735cm-1 confirmed the presence of amide group. The shift in absorption maxima from 364nm to 376nm (red shift) in UV spectrum was a confirmation of increased Ni content. The different concentrations of composites showed great impact on the degradation of methylene blue.

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Kim, Yu-Jin, Jaeyoung Lee, Gwang-Bum Im, Jihun Song, Jiwoo Song, Jiyong Chung, Taekyung Yu i Suk Ho Bhang. "Dual Ion Releasing Nanoparticles for Modulating Osteogenic Cellular Microenvironment of Human Mesenchymal Stem Cells". Materials 14, nr 2 (15.01.2021): 412. http://dx.doi.org/10.3390/ma14020412.

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In this study we developed a dual therapeutic metal ion-releasing nanoparticle for advanced osteogenic differentiation of stem cells. In order to enhance the osteogenic differentiation of human mesenchymal stem cells (hMSCs) and induce angiogenesis, zinc (Zn) and iron (Fe) were synthesized together into a nanoparticle with a pH-sensitive degradation property. Zn and Fe were loaded within the nanoparticles to promote early osteogenic gene expression and to induce angiogenic paracrine factor secretion for hMSCs. In vitro studies revealed that treating an optimized concentration of our zinc-based iron oxide nanoparticles to hMSCs delivered Zn and Fe ion in a controlled release manner and supported osteogenic gene expression (RUNX2 and alkaline phosphatase) with improved vascular endothelial growth factor secretion. Simultaneous intracellular release of Zn and Fe ions through the endocytosis of the nanoparticles further modulated the mild reactive oxygen species generation level in hMSCs without cytotoxicity and thus improved the osteogenic capacity of the stem cells. Current results suggest that our dual ion releasing nanoparticles might provide a promising platform for future biomedical applications.

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Madkhali, Nawal. "Analysis of Structural, Optical, and Magnetic Properties of (Fe,Co) Co-Doped ZnO Nanoparticles Synthesized under UV Light". Condensed Matter 7, nr 4 (8.11.2022): 63. http://dx.doi.org/10.3390/condmat7040063.

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In this report, we discuss the preparation of undoped and (Fe,Co) co-doped ZnO nanocomposites via an ultrasonicated probe, which were both under UV irradiation for 12 h and annealed at 400 °C for four hours in ambient air. Here, we investigated the different concentration of dopant transition metals (ZnO-Fe1-x-Cox) (x = 0.03, 0.05, and 0.07). X-ray diffraction (XRD) analyses confirmed the nanophase, crystallinity, good uniformity, and around 28 nm core sizes of all of the (ZnO-Fe1-x-Cox) as-synthesized composites with different rates. The optical properties of ZnO doped with a high percent of Fe nanoparticles displayed an increase in absorption in the UV region and a slight decrease in the energy band gap to 3.13 eV. Magnetic measurements revealed that doping enhanced the ferromagnetism of ZnO. Recent studies which aimed to improve the optical and magnetic properties of metal oxides, the most important of which being zinc oxide, have allowed their applications to diversify and multiply in the medical, industrial, and electronic fields.

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Thakur, Deepika, Anshu Sharma, Dharmender Singh Rana, Nagesh Thakur, Dilbag Singh, Tomas Tamulevicius, Mindaugas Andrulevicius, Sigitas Tamulevicius, Sudheesh K. Shukla i Sourbh Thakur. "Facile Synthesis of Silver-Doped Zinc Oxide Nanostructures as Efficient Scaffolds for Detection of p-Nitrophenol". Chemosensors 8, nr 4 (3.11.2020): 108. http://dx.doi.org/10.3390/chemosensors8040108.

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In this paper, silver-doped zinc oxide nanoparticles were synthesized by using a solution combustion technique, in which zinc nitrate is used as an oxidizer and tartaric acid as a fuel. The phase composition, morphology and structural properties of the as-synthesized zinc oxide and silver-doped zinc oxide were established by using powdered X-ray diffraction, field emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy studies. Due to well-defined morphologies and crystallinity, the pure zinc oxide and silver-doped zinc oxide nanostructures can be used as efficient chemical sensors for the detection of p-nitrophenol (PNP). ZnO was found to show a low value of the limit of detection (LOD), i.e., 2.175 µM/L, for p-nitrophenol sensing; moreover, a sharp decrease in the limit of detection was observed with an increase in the concentration of silver ions, and the LOD value decreased to 0.669 µM/L for 10 mol % silver-doped zinc oxide. It is therefore concluded that Ag-doped ZnO shows a lower limit of detection as compared to pure ZnO for p-nitrophenol sensing.

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Sumalatha, R., M. Sivakumar i G. Parthasarathy. "Characterization and Antibacterial Activity of Cu doped ZnO Thin Film Prepared by Sol-Gel Dip Coating Method and Phytosynthesized Zinc Oxide Nanoparticles from Senna alata and Euphorbia hirta". Asian Journal of Chemistry 34, nr 10 (2022): 2604–10. http://dx.doi.org/10.14233/ajchem.2022.23870.

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Zinc oxide nanoparticles exhibit significant antibacterial activity. The present study focused on determining the antibacterial activity of green synthetic zinc oxide nanoparticles (ZnO NPs) and Cu doped ZnO thin film. The prepared ZnO NPs and Cu doped ZnO films were characterized by XRD analysis, SEM, FTIR and UV-vis. Amorphous and nano cluster shapes were observed in SEM analysis. The presence of different chemical functional groups was confirmed by FTIR analysis. The optical properties Cu doped ZnO nanostructures were analyzed by UV-visible analysis. The results clearly confirmed the efficient synthesis of spherical ZnO nanoparticles with average size range from 40 to 50 nm. The Cu doped ZnO thin films and ZnO nanoparticles showed dose-dependent antibacterial activity against Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Salmonella typhi and Pseudomonas aeruginosa. The IC50 value was calculated as approximately 60 μg/mL. Growth kinetics studies were performed in the presence of ZnO nanoparticles demonstrated the bacteriostatic effect of ZnO nanoparticles.

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Nabeel, Asmaa I. "Samarium enriches antitumor activity of ZnO nanoparticles via downregulation of CXCR4 receptor and cytochrome P450". Tumor Biology 42, nr 3 (marzec 2020): 101042832090999. http://dx.doi.org/10.1177/1010428320909999.

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Cancer is the leading cause of death and exhausts human and economic resources for treatment and protection. Zinc oxide nanoparticles play an effective role in tumor treatment but with some cautions, such as overexpression of cytochrome P450, hepatic overload, and the mammalian target of rapamycin pathway resistance. Although lanthanides have antitumor activity, their use is limited. Therefore, the current study aims to improve the effectiveness of zinc oxide nanoparticle via doping with lanthanides, such as samarium. In vitro study revealed that samarium doped with zinc oxide showed more antitumor activity than the other lanthanides, and the antitumor activity depends on the concentration of samarium in the nanocomposite. The in vivo experiment on mice bearing Ehrlich solid tumor revealed that intramuscular injection of samarium/zinc oxide downregulates the expressions of CXCR4 and PI3K/Akt/mammalian target of rapamycin pathway in respect to Ehrlich solid tumor group. Regarding the apoptotic biomarkers, samarium/zinc oxide upregulates the apoptotic biomarker; Bax accompanied with the mitotic catastrophe which was indicated by cell cycle arrest in G2 phase. Moreover, samarium:zinc oxide nanoparticles exhibited minimum toxicity which was indicated by suppressed activities of cytochrome P450 and hepatic enzymes, including alanine transaminase and aspartate transaminase. In addition, the histopathological finding, as well as immunophenotyping results, appreciated the biochemical finding. Therefore, samarium:zinc oxide might be offered a new approach to improve the effectiveness of zinc oxide nanoparticles along with lower toxic effect. Also, samarium:zinc oxide nanoparticles can be a candidate as a new antitumor compound to detect its mode of action.

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Ahmad, Khuram Shahzad, i Shaan Bibi Jaffri. "Phytosynthetic Ag doped ZnO nanoparticles: Semiconducting green remediators". Open Chemistry 16, nr 1 (14.06.2018): 556–70. http://dx.doi.org/10.1515/chem-2018-0060.

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AbstractHighly stable semiconducting silver doped zinc oxide nanoparticles have been synthesized via facile, biomimetic and sustainable route, through utilization of Zinc acetate dihydrate (C4H6O4Zn · 2H2O) as host, Silver nitrate (AgNO3) as dopant and phytochemicals of angiospermic medicinal plant Prunus cerasifera as the reducing agents. Synthesis of Ag doped ZnO nanoparticles was done in a one pot synthetic mode by varying the amount of dopant from 0.2 – 2.0%. Synthesized photocatalyst nanoparticles were analyzed via UV-vis, FTIR, XRD and SEM. Commendable alleviation in the direct band gap i.e. 2.81 eV was achieved as a result of doping. Silver doped zinc oxide nanoparticles size ranged between 72.11 – 100 nm with rough surface morphology and higher polydispersity degree. The XRD patterns revealed the hexagonal wurtzite geometry of crystals with an average crystallite size of 2.99 nm. Persistent organic dyes Methyl Orange, Safranin O and Rhodamine B were sustainably photodegraded in direct solar irradiance with remarkable degradation percentages up to 81.76, 74.11 and 85.52% in limited time with pseudo first order reaction kinetics (R2 =0.99, 0.99 and 0.97). Furthermore, efficient inhibition against nine microbes of biomedical and agriculturally significance was achieved. Synthesized nanoparticles are potential green remediators of polluted water and perilous pathogens.

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Srinivasan, N., i J. C. Kannan. "Investigation on room temperature photoluminescence of pure and aluminum doped zinc oxide nanoparticles". Materials Science-Poland 33, nr 1 (1.03.2015): 205–12. http://dx.doi.org/10.1515/msp-2015-0021.

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AbstractPure and aluminum doped zinc oxide nanoparticles were prepared by soft chemical method. The prepared nanoparticles were characterized by XRD, SEM-EDAX, UV-Vis, PL and FT-IR studies. XRD patterns revealed that the nanoparticles were crystallized in hexagonal wurtzite structure with an average particle size of 19 nm to 26 nm. The surface morphology was explored using SEM micrographs. The incorporation of aluminum was confirmed by EDAX and FT-IR studies. The band gaps of the particles were found from 3.48 eV to 3.53 eV through UV-Vis spectral studies. The defect related mechanism was investigated using PL measurements. The chemical functional groups in FT-IR spectra proved the formation of pure and aluminum doped zinc oxide nanoparticles.

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Ghiloufi, Imed, Jaber El Ghoul, Abueliz Modwi i Lassaad El Mir. "Preparation and characterization of Ca-doped zinc oxide nanoparticles for heavy metal removal from aqueous solution". MRS Advances 1, nr 53 (2016): 3607–12. http://dx.doi.org/10.1557/adv.2016.511.

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ABSTRACTNano zinc oxide (ZnO) and Calcium doped zinc oxide (CZ) nanopowders were synthesized by sol–gel method from zinc acetate di-hydrate and an adequate quantity of calcium chloride hexa-hydrate. Calcium doped zinc oxide (CZ) were prepared at different Ca concentrations from 1 wt% (CZ1) to 5 wt% (CZ5). The obtained nanopowders were characterized by transmission electron microscopy and X-ray diffraction. The objective of this work is to find a new and highly efficient nanomaterial for the adsorption of heavy metals from waste water. For this reason, the nanopowders were used to uptake heavy metals (Cr, Cd, and Ni) from aqueous solution. The obtained results show that the incorporation of Ca in nanoparticles zinc oxide (ZnO) increases the capacity adsorption of nanopowders and CZ3 is more efficient than the other Ca-doped samples. In this work we studied also the effect of pH and the pyrolysis temperature of the nanopowders on the removal of heavy metal ions from aqueous solution by CZ3.

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Etape, Ekane Peter, Josepha Foba-Tendo, Lambi John Ngolui, Beckley Victorine Namondo, Fomogne Cyrille Yollande i Marius Borel Nguefack Nguimezong. "Structural Characterization and Magnetic Properties of Undoped and Ti-Doped ZnO Nanoparticles Prepared by Modified Oxalate Route". Journal of Nanomaterials 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/9072325.

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Ti-doped zinc oxide and pure zinc oxide nanoparticles were synthesized by a modified oxalate route using Averrhoa carambola fruit juice as a natural source of oxalate. The characteristics of the precursors have been investigated by FTIR, TGA, and XRD. The results from the investigation revealed that the precursors are zinc oxalate and Ti-doped zinc oxalate which readily decompose at 450°C. The as-prepared precursors were calcined at 450°C for 4 hours, and the decomposition products have been characterized by XRD, SEM, EDX, and VSM. XRD results revealed crystallinity with hexagonal wurtzite structure, while the average grain size was found to be 26 nm for Ti-doped ZnO and 29 nm for ZnO, using calculations based on Debye-Scherrer equation. Furthermore, the morphological studies by SEM showed particle agglomeration, while the presence of Ti3+ in the zinc oxide lattice is indicated by EDS analysis. Finally the hysteresis loop from VSM results shows that Ti-doped ZnO exhibits ferromagnetism.

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Bharat, T. C., Shubham, S. Mondal, H. S.Gupta, P. K. Singh i A. K. Das. "Synthesis of Doped Zinc Oxide Nanoparticles: A Review". Materials Today: Proceedings 11 (2019): 767–75. http://dx.doi.org/10.1016/j.matpr.2019.03.041.

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El Mir, L. "Luminescence properties of calcium doped zinc oxide nanoparticles". Journal of Luminescence 186 (czerwiec 2017): 98–102. http://dx.doi.org/10.1016/j.jlumin.2017.02.029.

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Aggarwal, Nupur, Ajay Vasishth, Kamaldeep Kaur i N. K. Verma. "Nanoscale Properties of Dysprosium-Doped Zinc Oxide Nanoparticles". Journal of Superconductivity and Novel Magnetism 33, nr 3 (8.09.2019): 883–88. http://dx.doi.org/10.1007/s10948-019-05274-7.

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KUMAR, DHIRAJ, SUNIL KUMAR i H. S. BHATTI. "LASER-INDUCED PHOTOLUMINESCENT STUDIES OF Al-DOPED ZINC OXIDE NANOPARTICLES". International Journal of Nanoscience 09, nr 05 (październik 2010): 439–45. http://dx.doi.org/10.1142/s0219581x10007101.

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In this paper, addition of aluminum in zinc oxide is incorporated using low-temperature chemical synthesis route. Aluminum ions help in crystallization of zinc oxide nanoparticles. Characterization of the synthesized nanoparticles of zinc oxide has been done using Transmission electron microscope (TEM), and X-ray diffraction (XRD) analysis, Energy-resolved photoluminescence (PL) spectra and Time-resolved laser-induced photoluminescence (TRPL) at room temperature. Transmission electron microscopic observations and X-Ray diffraction studies indicate highly crystalline nature and particle size of the order of 20 nm in ZnO:Al . Time-resolved laser-induced photoluminescence measurements have been done using pulsed nitrogen laser as an excitation source, operated at wavelength 337.1 nm and having high peak output power of 1 MW. The results show that at higher concentrations of Al doping in host ZnO phosphor, emission intensity is more by several orders of magnitude and lifetime shortening indicates that these nanoparticles are more efficient as compared with lower concentrations of dopant.

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Mu, Shuxiang, Dezhen Wu, Shengli Qi i Zhanpeng Wu. "Preparation of Polyimide/Zinc Oxide Nanocomposite Films via an Ion-Exchange Technique and Their Photoluminescence Properties". Journal of Nanomaterials 2011 (2011): 1–10. http://dx.doi.org/10.1155/2011/950832.

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Polyimide (PI) composite films with ZnO nanoparticles embedded in the surface layer were prepared by alkali hydrolyzation following ion exchange in Zn(NO3)2solution and thermal treatment of the zinc ion-doped PI films in air atmosphere. The effect of alkali treatment, ion exchange, and thermal treatment conditions was investigated in relation to the amount of zinc atomic loading, morphology, photoluminescence (PL), and thermal properties of the PI/ZnO composite films using ICP, XPS, FE-SEM, TEM, Raman microscope, TGA, and DSC. ZnO nanoparticles were formed slowly and dispersed uniformly in the surface-modified layers of PI films with an average diameter of 20 nm. The PL spectra of all the PI/ZnO nanocomposite films obtained at 350°C/7 h possessed a weak ultraviolet emission peak and a broad and strong visible emission band. The PI/ZnO nanocomposite films maintained the excellent thermal property of the host PI films.

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Cieniek, Bogumił, Ireneusz Stefaniuk, Ihor Virt, Roman V. Gamernyk i Iwona Rogalska. "Zinc–Cobalt Oxide Thin Films: High Curie Temperature Studied by Electron Magnetic Resonance". Molecules 27, nr 23 (2.12.2022): 8500. http://dx.doi.org/10.3390/molecules27238500.

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The material with a high Curie temperature of cobalt-doped zinc oxide embedded with silver-nanoparticle thin films was studied by electron magnetic resonance. The nanoparticles were synthesized by the homogeneous nucleation technique. Thin films were produced with the pulsed laser deposition method. The main aim of this work was to investigate the effect of Ag nanoparticles on the magnetic properties of the films. Simultaneously, the coexisting Ag0 and Ag2+ centers in zinc oxide structures are shown. A discussion of the signal seen in the low field was conducted. To analyze the temperature dependence of the line parameters, the theory described by Becker was used. The implementation of silver nanoparticles causes a significant shift of the line, and the ferromagnetic properties occur in a wide temperature range with an estimated Curie temperature above 500 K.

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Kumar, Pandi Suresh, i Arputharaj Samson Nesaraj. "In vivo Sub Acute Toxicity Studies of Zinc Oxide and Silver/Selenium Doped Zinc Oxide Nanoparticles after Oral Ingestion in Swiss Albino Mice". Asian Journal of Chemistry 34, nr 10 (2022): 2739–48. http://dx.doi.org/10.14233/ajchem.2022.23926.

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The nanoparticles, such as ZnO, Ag doped ZnO (Zn0.80Ag0.20O1-δ) and Se doped ZnO (Zn0.80Se0.20O1-δ) were prepared by chemical synthesis route. In order to understand their sub-acute toxicity level in animal system, these nanoparticles were suspended in water and administered orally for 14 consecutive days to Swiss albino mice. At the end of 14th day, the animals were killed via cervical dislocation method. The examination of their serum and the organs, viz. liver and kidney was carried out. This comprises of resolving of serum biochemical levels and organ indices. A significant elevation of γ-GT, AST, ALT and LDH levels in mice when exposed with Ag/Se doped ZnO nanparticles in comparison with ZnO nanoparticles was found out. The results of enzymatic/non-enzymatic assays (protein, ROS, LPO, LDH, NO, GSH and GPx) inferred that the ZnO based nanoparticles treated mice group has shown higher levels of free radicals inside the cell and caused severe tissue damage. From AAS studies, the accumulation of zinc in the liver in mice was noticed. The result of western blotting analysis was also reported.

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Aranda, Alejandro, Richard Landers, Patricio Carnelli, Roberto Candal, Hugo Alarcón i Juan Rodríguez. "Influence of silver electrochemically deposited onto zinc oxide seed nanoparticles on the photoelectrochemical performance of zinc oxide nanorod films". Nanomaterials and Nanotechnology 9 (1.01.2019): 184798041984436. http://dx.doi.org/10.1177/1847980419844363.

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The present article examines the synthesis and characterization of zinc oxide nanorods grown on zinc oxide and silver nanoparticle seeds. Zinc oxide seeds were electrodeposited on a support of fluorine-doped tin oxide glass and heat-treated at 380°C. Silver nanoparticles were then deposited on this substrate, which was heat-treated at 160°C. Their presence was confirmed using ultraviolet–visible spectroscopy, by observing an absorption peak around 400 nm, corresponding to surface plasmon resonance. Growth of zinc oxide nanorods was achieved in a chemical bath at 90°C. The obtained films were analyzed by cyclic voltammetry, X-ray diffraction, and scanning electron microscopy. They consisted of zinc oxide with a Wurtzite-type crystal structure, arranged as nanorods of 50 nm. X-ray photoelectron spectroscopy exhibits peaks attributed to silver (0) and to the formation of silver oxide on the silver nanoparticle surface. In addition, two types of oxygen (O 1 s) were observed: oxygen from the crystalline network (O–2) and chemisorbed oxygen (–OH), for the seed and the nanorod films, respectively. The nanorods grown on zinc oxide seeds with silver deposits had a round shape and greater photoactivity than those grown without silver. This difference is attributed to the additional reflection that silver provides to the light reaching the film, thereby increasing the photogeneration from the charge carriers.

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Kiełbik, Paula, Aneta Jończy, Jarosław Kaszewski, Mikołaj Gralak, Julita Rosowska, Rafał Sapierzyński, Bartłomiej Witkowski i in. "Biodegradable Zinc Oxide Nanoparticles Doped with Iron as Carriers of Exogenous Iron in the Living Organism". Pharmaceuticals 14, nr 9 (27.08.2021): 859. http://dx.doi.org/10.3390/ph14090859.

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Iron plays an important role in various crucial processes in the body and its deficiency is considered currently as a serious health problem. Thus, iron supplementation strategies for both humans and animals need to be effective and safe. According to our previous studies, zinc-based nanoparticles provide safe, biodegradable, fast and efficient transport system of orally given substances to the tissues. In the current manuscript we present results of a study aimed at investigation of the ZnO nanoparticle-based Fe supplementation system (average size 100 × 250 nm). Nanostructures were orally (gavage) administered to adult mice. Animals were sacrificed at different time points with collection of blood and internal organs for analyses (tissue iron concentration, hepatic level of hepcidin, blood parameters, liver and spleen levels of ferritin, histopathology). Initial experiment was performed to compare the biological effect of doping type (Fe3+ doping vs. a mixture of Fe3+ and Fe2+). Then, the effect of acute/chronic exposure models was determined. The increase in ferritin, along with improved, crucial hematological parameters and lack of the influence on hepcidin expression indicated the chronic application of Fe3+,2+ doped ZnO nanostructures to be the most effective among tested.

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Chanda, Anupama, Shipra Gupta, M. Vasundhara, Shalik R. Joshi, Geeta R. Mutta i Jai Singh. "Study of structural, optical and magnetic properties of cobalt doped ZnO nanorods". RSC Advances 7, nr 80 (2017): 50527–36. http://dx.doi.org/10.1039/c7ra08458g.

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Nien, Yu-Hsun, Zhi-Xuan Kang, Tzu-Yu Su, Chih-Sung Ho, Jung-Chuan Chou, Chih-Hsien Lai, Po-Yu Kuo i in. "Investigation of Flexible Arrayed Lactate Biosensor Based on Copper Doped Zinc Oxide Films Modified by Iron–Platinum Nanoparticles". Polymers 13, nr 13 (23.06.2021): 2062. http://dx.doi.org/10.3390/polym13132062.

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Potentiometric biosensors based on flexible arrayed silver paste electrode and copper-doped zinc oxide sensing film modified by iron-platinum nanoparticles (FePt NPs) are designed and manufactured to detect lactate in human. The sensing film is made of copper-doped zinc oxide (CZO) by a radio frequency (RF) sputtering system, and then modified by iron-platinum nanoparticles (FePt NPs). The surface morphology of copper-doped zinc oxide (CZO) is analyzed by scanning electron microscope (SEM). FePt NPs are analyzed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The average sensitivity, response time, and interference effect of the lactate biosensors are analyzed by voltage-time (V-T) measurement system. The electrochemical impedance is analyzed by electrochemical impedance spectroscopy (EIS). The average sensitivity and linearity over the concentration range 0.2–5 mM are 25.32 mV/mM and 0.977 mV/mM, respectively. The response time of the lactate biosensor is 16 s, with excellent selectivity.

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Allam, E. A., R. M. El-Sharkawy, Kh S. Shaaban, A. El-Taher, M. E. Mahmoud i Y. El Sayed. "Structural and thermal properties of nickel oxide nanoparticles doped cadmium zinc borate glasses: preparation and characterization". Digest Journal of Nanomaterials and Biostructures 17, nr 1 (styczeń 2022): 161–70. http://dx.doi.org/10.15251/djnb.2022.171.161.

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Nickel-doped cadmium zinc borate glass of various nickel oxide content was prepared as xNiO–20ZnO–60B2 O3 –(20-x) CdO (0≤x≤5 mol %), by the melt quenching method based on nano metal oxides. Both the zinc oxide nanoparticles (ZnO NPs) and cadmium oxide nanoparticles (CdO NPs) were prepared via the solution–combustion technique. Nickel oxide nanoparticles (NiO NPs) was synthesized by the combustion of Ni(OH)2 and boron oxide nanoparticles (B2 O3 NPs)was synthesized by the solid-state reaction method. The amorphous nature of these types of glass was confirmed using X-ray diffraction analysis (XRD). The morphology of nano-metal oxides was investigated via the scanning electron microscope (SEM). SEM imaging showed that the NiO NPs had a semi-spherical morphology, and that their average particle size was 22.17 nm. The Fourier-transform infrared spectroscopy’s (FTIR) spectral analysis was used to identify the structural units of these types of glass via deconvolution, in terms of multi-Gaussian fitting. Results proved that Ni 4+ plays an important role and a key to improve the formation of the BO4 network units. Finally, the high thermal stability and glass transition temperature of the prepared glass samples were increased by increasing the loading of NiO NPs from 0.0 mol % - 5.0 7k = mol % and this was established by using DTA.

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Khalid, Awais, Pervaiz Ahmad, Abdulrahman I. Alharthi, Saleh Muhammad, Mayeen Uddin Khandaker, Mohammad Rashed Iqbal Faruque, Israf Ud Din, Mshari A. Alotaibi i Abdulhameed Khan. "Synergistic effects of Cu-doped ZnO nanoantibiotic against Gram-positive bacterial strains". PLOS ONE 16, nr 5 (14.05.2021): e0251082. http://dx.doi.org/10.1371/journal.pone.0251082.

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A viable hydrothermal technique has been explored for the synthesis of copper doped Zinc oxide nanoparticles (Cu-doped ZnO-NPs) based on the precursor’s mixture of Copper-II chloride dihydrate (CuCl2.2H2O), Zinc chloride (ZnCl2), and potassium hydroxide (KOH). X-ray diffraction (XRD) reported the hexagonal wurtzite structure of the synthesized Cu-doped ZnO-NPs. The surface morphology is checked via field emission scanning electron microscopy (FE-SEM), whereas, the elemental compositions of the samples were confirmed by Raman, and X-ray photoelectron spectroscopy (XPS), respectively. The as-obtained ZnO-NPs and Cu-doped ZnO-NPs were then tested for their antibacterial activity against clinical isolates of Gram-positive (Staphylococcus aureus, Streptococcus pyogenes) and Gram-negative (Escherichia coli, Klebsiella pneumonia) bacteria via agar well diffusion method. The zone of inhibition (ZOI) for Cu-doped ZnO-NPs was found to be 24 and 19 mm against S. Aureus and S. pyogenes, and 18 and 11 mm against E. coli and K. pneumoniae, respectively. The synthesized Cu-doped ZnO-NPs can thus be found as a potential nano antibiotic against Gram-positive multi-drug resistant bacterial strains.

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Destalina, Destalina, Fitriah Mujtahid, Inayatul Mutmainna, Dahlang Tahir i Paulus L. Gareso. "XRD STRUCTURE STUDY ON NICKEL DOPED ZINC OXIDE NANOPARTICLES SYNTHESIZED BY COPRECIPITATION METHOD". Indonesian Physical Review 5, nr 3 (18.08.2022): 188–96. http://dx.doi.org/10.29303/ipr.v5i3.179.

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Nickel-doped Zinc Oxide (Zn(1-x)Ni(x)O) nanoparticles have been synthesized by the chemical coprecipitation method. The structure and characteristic of synthesized Ni doped ZnO nanoparticles ware analyzed by X-ray diffraction (XRD) patterns. Crystallite sizes and lattice strain of all samples were calculated using the Scherrer’s formula, Uniform Deformation Model (UDM) and Halder-Wagner (H-W) method. X-ray diffraction analysis confirmed hexagonal cubic structure of Ni-doped ZnO nanoparticles. Also, the crystallite size of the nanoparticles reduces as the nickel concentration increase. The result showed the average crystallite size calculated by Scherrer’s formula (25-29 nm) was smaller than crystallite size using UDM method (51-63) the largest average crystallite size and H-W method (42-47 nm). The lattice strain increases with decreasing crystallite sizes value. The crystal size Ni- doped ZnO nanoparticles decreased with increasing dopant concentration.

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