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    Wyświetlanie 1-10 z 10
    Tytuł:
    Studying structural and optical properties of ZnO-CdO nanocomposites
    Autorzy:
    Abdul-Ameer, Zehraa N.
    Agool, Ibrahim R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193878.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CdO
    ZnO
    ZnO-CdO
    nanocomposite
    nanocomposites
    sol gel
    Opis:
    Zinc oxide, cadimium oxide and their composites were synthesized in this research using sol-gel method and characterized by X-ray diffraction, to investigate their optical properties using UV-visible, photoluminenscence (PL) spectroscopy, which showed red shift behavior in the ZnO manner enhanced by addition of CdO which noticed through calculations of energy gap.
    Źródło:
    World Scientific News; 2015, 23; 35-45
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of molarity on the structural and optical properties of ZnO thin films deposit by CSP
    Autorzy:
    Habubi, Nadir F.
    Abood, Ziad M.
    Algamel, Ahmed N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193915.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Urbach energy
    ZnO
    ZnO thin films
    optical properties
    structural properties
    Opis:
    ZnO thin films have been prepared by chemical spray pyrolysis technique CSP). XRD pattern reveals that the preferred orientation was varied with concentration, topography analysis was done by AFM micrograph which confirm the existence of nonstructural films. The optical properties was done by recorded the transmittane and absorbance which were affected by an increase in concentration. The values of optical energy gap obtained from Tauc relation were 3.17, 3.18 and 3.19 eV for 0.05, 0.1 and 0.5 M respectively. Urbach energy confirms the decrease in band tail as the concentration increase.
    Źródło:
    World Scientific News; 2015, 22; 55-69
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Photocatalytic Activity of Zinc Oxide Photocatalyst by Sensitization with Riboflavin as a Photosensitizer
    Autorzy:
    Adrees, Hussein
    Nema, Noor A.
    Jassim, Abbas
    Abdali, O. Karar
    Kahdum, Salih
    Mousa, Abdulazeez O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193912.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ZnO
    industrial wastewater
    photosensitizer
    riboflavin
    sensitization
    Opis:
    This project involves modification of the photoresponse of zinc oxide by sensitization with riboflavin (RF) as a photosensitizer. Sensitization of the surface of zinc oxide with RF was performed using impregnation method. Modification of zinc oxide surface with this photosensitizer was investigated using different techniques such as XRD, FTIR, SEM and UV-Visible spectroscopy. The photocatalytic activity of both neat and sensitized zinc oxide was investigated by removal of methylene blue dye (MB) from the simulated industrial wastewater. Removal of this dye from the aqueous solutions was conducted by measuring the absorbance of this dye at 665 nm.
    Źródło:
    World Scientific News; 2015, 22; 29-39
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of ZnO thin film using sol-gel dip-coating technique and their characterization for optoelectronic applications
    Autorzy:
    Chaudhary, Preeti
    Kumar, Vipin
    Powiązania:
    https://bibliotekanauki.pl/articles/1075562.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Band gap
    SEM
    XRD
    ZnO
    dip coating
    Opis:
    ZnO thin film with an aim to employ in opto-electronic applications was prepared using sol-gel dip-coating route and thereafter sintered at temperature 500 ºC. The film has been investigated by XRD pattern, SEM, UV-Vis and photoluminescence spectroscopy for physical and optical characterization of ZnO thin film. X-Ray diffraction pattern analysis reveals the polycrystalline nature with hexagonal wurtzite structure having orientation along the plane (002). Scanning electron micrograph shows symmetrical dense ZnO rod throughout the surface. The diffuse reflectance spectrum is studied in the range of wavelength 300-800 nm. A band gap of 3.21 eV is calculated using Kubelka-Munk function. PL spectrum shows strong peak at 380 nm due to oxygen vacancy of ZnO.
    Źródło:
    World Scientific News; 2019, 121; 59-66
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Higher Solar Cell Efficiency Achieved with ZnO/Si heterojuction
    Autorzy:
    Ayad, jumaah kadhim
    Muneer, H. Jaduaa Alzubaidy
    Abd, Ahmed N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1161880.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AFM
    XRD
    ZnO/Si
    chemical method
    conversation efficiency
    solar cell
    Opis:
    In this work, the zinc oxide nanoparticles were prepared chemically and deposited by casting style on glass bases and treated thermally at a temperature of 600 °C. The study focused on Optical and structural properties of thin films. An optical advantages of Zinc Oxide (ZnO) were characterized by using ultraviolet visible Spectroscopy. And the structure by using X-Ray Diffraction and (AFM). The optical advantages of thin films were studied by recording the transmittance spectra of wavelengths range (300-900 nm). The energy gap was calculated using tauc equation and is found (3 eV). I-V properties of the solar cell under light at 40 mW/cm2 flounce was investigated. The open circuit Voltage (Voc) was 33 and Short-circuit density (Isc) was 0.017 mA. This measurements show that the fill factor (F.F) and conversation efficiency (η), were 55% and 9.9% respectively.
    Źródło:
    World Scientific News; 2018, 112; 226-234
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characterization of ZnO/p-Si Heterojunction Solar Cell
    Autorzy:
    Habubi, Nadir F.
    Mousa, Abdulazeez O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193961.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    chemical spray pyrolysis
    heterojunction solar cell
    n-ZnO/p-Si
    Opis:
    Zinc oxide thin films was deposited by chemical spray pyrolysis (CSP) at 400 °C substrate temperature and different thickness (60, 80, and 100) nm on the texturized p-Si wafer to fabricate ZnO/p-Si heterojunction solar cell. Structural, optical, electrical and photovoltaic properties are investigated for the samples. XRD analysis reveals that all the as deposited ZnO films show polycrystalline structure, without any change due to increase of thickness. Average diameter calculated from AFM images shows an increase in its value with increasing thickness, ranging from 59.82-95.7 nm. The optical reflections for samples are measured using UV-Vis spectrophotometer. Photoluminescence (PL) spectra of (CSP) grown ZnO/p-Si with different thickness were used to study the energy gap. The electrical properties of heterojunction were obtained by I-V (dark and illuminated) and C-V measurement. I-V characteristic of the ZnO/p-Si heterojunction shows good rectifying behavior under dark condition. The ideality factor and the saturation current density was calculated. Under illuminated the photovoltaic measurements (open-circuit voltage (Voc), short-circuit current density (JSC), fill factor (FF), and quantum efficiencies are calculated for all samples. The built- in potential (Vbi), carrier concentration and depletion width are determined under different thickness from C-V measurement.
    Źródło:
    World Scientific News; 2015, 18; 78-92
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibacterial activity of modified zinc oxide nanoparticles against Pseudomonas aeruginosa isolates of burn infections
    Autorzy:
    Aysa, Noor Hadi
    Salman, Halah Dawood
    Powiązania:
    https://bibliotekanauki.pl/articles/1191368.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Antimicrobial activity
    Pseudomonas aeruginosa
    ZnO
    burn infection
    nanoparticles
    surface modification
    Opis:
    In this research antimicrobial activity of nanoparticles ZnO on perilous bacteria such as Pseudomonas aeruginosa was evaluated. P. aeruginosa is important pathogen that caused burn wound infections as it is multi-drug resistant and has several virulence factors. Fifteen samples of P. aeruginosa were collected from patients who suffering from Burn infections in Al-Hilla teaching hospital burn unit with the age range between (7-80) years old for both genders. After collecting burn samples, the diagnosis and characterization were performed by culturing and biochemical tests. ZnO NPs were synthesized by chemical method, Zinc oxide nanoparticles are well-known to be one of the multifunctional inorganic compounds which are widely used in medical applications. This study aims to prepare ZnO nanoparticles with particle size ranging from 23-29  nm. In the present study, surface modification of ZnO nanoparticles was performed, and influence of modification of the structure and morphological properties was investigated. The resulting nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force (AFM). Zinc oxide nanoparticles with the average diameter of about 29 nm were modified with an oleic acid to exert more compatibility. From the results obtained it is suggested that modified ZnO-nanoparticles could be used effectively in safety environmental and medical applications. Antibacterial activity for nanoparticle ZnO against P. aeruginosa isolates was measured by: Agar Diffusion Technique and Minimum Inhibitory Concentration (MIC)/Minimum bactericidal Concentration (MBC) with microdilution. The best zone of inhibition was (35.5mm) at a concentration of 40 μg/ml of nano-ZnO in one strain of P. aeruginosa while the lowest inhibition zone was (16 mm) at a concentration of 20 μg/ml of nano ZnO in one strain also. In addition, all P. aeruginosa isolates were completely inhibited at the concentration of 3.7 μg/ml of nano-ZnO (MIC) but no significant antibacterial activity was observed at concentrations less than 1.8 μg/ml of nano-ZnO and the (MBC) was same as MIC (3.7 μg/ml) for all P.aeruginosa isolates.
    Źródło:
    World Scientific News; 2016, 33; 1-14
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Zno Nano Material Interaction With Nd:YAG Laser Under Vacuum
    Autorzy:
    Hussam, N. Mohammed Ali
    Yahya, Abdulkreem Salman
    Powiązania:
    https://bibliotekanauki.pl/articles/1179694.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Langmuir probe
    Nd:YAG laser etching
    Plasma generation
    ZnO nanomaterial
    electron density
    electron temperature
    Opis:
    The goal of this paper is to study the Nd:YAG laser interaction with the ZnO nanomaterial by etching the ZnO nanodisc surface. The preparation of ZnO nanodisc is studied also and the setup which we use in previous experiment published in the (IJRRR, Vol. X, Issue 1, March 2017) is used also. The interaction is done under vacuum conditions with high pressure in the range of (10-3) Tor. The main target of the paper is to study the plasma generated from the etching of the ZnO nanodisc by Nd:YAG laser.
    Źródło:
    World Scientific News; 2017, 72; 248-255
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Zinc oxide nanoparticles using extracts of Passiflora edulis Sims. f. flavicarpa Deg.
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192673.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Passiflora edulis Sims. f. flavicarpa Deg.
    UV-Visible double beam spectrophotometry
    aqueous extracts
    ZnO nanoparticles
    Opis:
    The synthesis of zinc oxide nanoparticles (ZnO) using herbal extract is always environmentally benign. The present investigation focuses on the synthesis of ZnO nanoparticles using aqueous extracts of various parts of Passiflora edulis Sims. f. flavicarpa Deg. (Passion fruit). The plant is rich in alkaloids, glycosides, flavonoids and triterpenes. UV-Visible double beam spectrophotometric analysis was used for characterization of ZnO nanoparticles with different time intervals which were synthesized by plant extracts. The bio-reduction completes in two hr incubation of reaction mixtures with strong broad peaks at 332 nm from leaves, 296 nm from stem and 326 nm from flower extracts. Hence the biosynthesis of ZnO nanoparticles using aqueous extracts of P. edulis could be an alternative to chemical methods and exploited in various biofields.
    Źródło:
    World Scientific News; 2016, 47, 2; 267-278
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biosynthesis, characterisation, free radical scavenging activity and anti-bacterial effect of plant-mediated zinc oxide nanoparticles using Pithecellobium dulce and Lagenaria siceraria Leaf Extract
    Autorzy:
    Prakash, M. Jeevan
    Kalyanasundharam, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193960.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    2-2-diphenyl-1-picrylhydrazyl
    DPPH
    Energy Dispersive Xray
    Lagenaria siceraria
    Pithecellobium dulce
    Scanning Electron Microscopy
    Transmission Electron Microscope
    X-Ray
    ZnO
    by FTIR Spectroscopy
    gram-positive and gram negative bacterial
    Opis:
    The study involved synthesis of Zinc Oxide nanoparticles using biological and chemical reducing agents. The aim was to compare the yield, nature and antimicrobial activity of nanoparticles. Nanoparticles synthesized by the two methods were characterized by FTIR Spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive Xray (EDAX), Transmission Electron Microscope (TEM) and X-ray diffraction (XRD). In biological method, Pithecellobium dulce and Lagenaria siceraria leaf extract; and in chemical method, sodium hydroxide was used as reducing agents. Antibacterial study was carried out on gram-positive and gram negative bacterial strains by disc diffusion method. The biologically synthesized ZnO Nanoparticles showed better antimicrobial activities with respect to the activities of synthetic drugs than chemical method. Antioxidant potential of synthesized nanoparticles was assessed through 2,2–diphenyl-1-picrylhydrazyl (DPPH) method.
    Źródło:
    World Scientific News; 2015, 18; 60-77
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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