scholarly journals Structural and Optical Properties of Alcohol, Alcohol-Aqueous and Aqueous Mediums Mediated Zinc Oxide/Copper Oxide (Zno/Cuo) Nanocomposites Synthesized Via Co-Precipitation Process

2020 ◽  
Vol 9 (5) ◽  
pp. 1564-1566
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Copper Oxide ◽  
Electronic Device ◽  
Precipitation Process ◽  
X Ray Diffraction ◽  
Composites Materials ◽  
Physico Chemical ◽  
Device Applications ◽  
Co Precipitation

By using different solvents the zinc oxide/copper oxide (ZnO/CuO) nanocomposites were synthesized via co-precipitation process. A Physico-chemical property of zinc oxide/copper oxide nanocomposites was identified by powder X-ray diffraction (XRD) and Photoluminescence (PL) techniques. The obtained results were demonstrated that the alcoholic mediated zinc oxide/copper oxide nanocomposites are exhibit smaller crystalline size and enhanced optical properties than that of aqueous mediated nanocomposites materials. From the results, it was confirmed that the synthesized samples would be promising metal oxide composites materials for opto-electronic device applications.

Microstructural and Electrical Properties of ZnO Ceramics with ZnO-Na2O-P2O5 Glass Oxide Additions

2014 ◽  
Vol 912-914 ◽  
pp. 231-234
Author(s):  
Wen Shiush Chen ◽  
Cheng Hsing Hsu ◽  
Chang Yi Peng ◽  
Ming Lang Hung ◽  
Ching Fang Tseng ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Electrical Properties ◽  
Electronic Device ◽  
Oxide Ceramics ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Suitable Candidate ◽  
X Ray ◽  
Device Applications ◽  
Zno Ceramics

The compositions, electrical properties and microstructures of zinc oxide ceramics with various 46.6ZnO-20Na2O-33.4P2O5glass oxide additions prepared by solid-state method have been investigated. The structure of the materials is studied using X-Ray diffraction, and the microstructure is analyzed using scanning electron microscopy. The results indicated that the electrical properties were associated with the amount of 46.6ZnO-20Na2O-33.4P2O5glass oxide additions and the sintering temperatures. The correlation between the microstructures, oxide additions and the sintering temperature was also discussed. From the results of electrical properties measurements, zinc oxide ceramics with various 46.6ZnO-20Na2O-33.4P2O5glass oxide additions exhibits a good electrical behavior, which can be a suitable candidate material for electronic device applications.

scholarly journals Effect of Precursors on Structural and Optical Properties of Sol-Gel Synthesized ZnO Nanopowders

2019 ◽  
Vol 31 (8) ◽  
pp. 1825-1829
Author(s):  
A. Vanaja ◽  
Jaison Jeevanandam ◽  
M. Suresh
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Optical Absorption ◽  
Sol Gel ◽  
Cost Effective ◽  
Optoelectronic Device ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Absorption And Emission ◽  
Device Applications

The present work aims at evaluating the outcome of zinc precursors on the crystal structure, shape, surface and optical properties of ZnO nanopowders. Zinc oxide nanopowders are fabricated via simple, cost-effective, low-temperature, the sol-gel method using different zinc precursors such as zinc nitrate and zinc chloride. The structural properties of the obtained ZnO nanopowders are studied using X-ray diffraction spectra and their morphology from SEM micrographs. Further, Fourier transform infrared spectra reveals the existence of functional groups that supports the formation of zinc oxide. Moreover, optical absorption and emission of ZnO nanopowders were evaluate during ultraviolet-visible and photoluminescence spectra. The results of this study revealed that the precursor is significant in altering the crystallite size, shape, optical absorption and emission entities of nanopowders. In addition, the role of zinc precursors to fabricate nanopowders that is suitable for various optoelectronic device applications were also discussed.

An Investigation on Structural and Optical Properties of Nanocrystalline Bismuth Ferrite and Manganese Sillenite Powders

2020 ◽  
Vol 835 ◽  
pp. 317-323
Author(s):  
D.A. Rayan ◽  
E.A. Abdel-Mawla ◽  
S.K. Mohamed ◽  
A.A. Mohamed ◽  
Mohamed M. Rashad
Keyword(s):  
Optical Properties ◽  
Bismuth Ferrite ◽  
Ammonium Hydroxide ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Munk Function ◽  
Ft Ir ◽  
Uv Visible ◽  
Co Precipitation

Nanocrystalline bismuth ferrite BFO; BiFeO3 and manganese sillenite, BMO; Bi12MnO20 (BMO) powders have been successfully elaborated using a facile co-precipitation approach. The formed materials were examined using X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM). Furthermore, the change in the optical properties was performed based on Fourier transform infrared spectroscopy (FT-IR) and UV-visible spectrophotometer. Typical, pure BiFeO3 and Bi12MnO20 phases were detected for the precursors precipitated at pH 10 based on ammonium hydroxide as a base then annealed at 500°C for 2h. Eventually, the optical band gap energy of BFO and BMO using Kubelka–Munk function based on Tauc’s plot was found to be 2.12 and 2.79 eV, respectively.

Physical and Optical Properties of Indium Oxide: Tin Nanoparticles Synthesized by Co-Precipitation Method

2015 ◽  
Vol 659 ◽  
pp. 604-608 ◽  
Author(s):  
Jiruntanin Kanoksinwuttipong ◽  
Wisanu Pecharapa ◽  
Russameeruk Noonuruk ◽  
Wicharn Techitdheera
Keyword(s):  
Optical Properties ◽  
Single Phase ◽  
Precipitation Method ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Optical Absorbance ◽  
Molar Ratios ◽  
Tin Nanoparticles ◽  
Ion Substitution ◽  
Co Precipitation

Indium oxide:tin nanoparticles were synthesized by co-precipitation method using InCl3 and SnCl4·5H2O as starting precursor with different molar ratios of Sn:In. The crystalline structure, optical properties, chemical bonding and morphologies of all samples were characterized by X-ray diffraction (XRD), UV–vis spectrometer, Raman spectroscopy and field emission scanning electron microscope, respectively. The XRD results show that the crystallinity of as-synthesized powders was initially amorphous phase. After calcination at 400 °C for 2 h, a single phase ITO powder with 10% (mol%) SnO2 was obtained. The particle size of each sample is approximately 20-25 nm. The color of indium oxide:tin nanopowders after heat treatment changed from white to yellow due to the substitution of oxygen vacancies in the sample. After calcination, the intensity of Raman peak significantly decreased with increasing amount of Sn loading. This phenomenon indicates that ion substitution may occur during the synthesis process. Moreover, it is noticed that the optical absorbance of obviously changed with increasing Sn loading.

scholarly journals Mg-Al-Cr2O7 Hydrotalcite-Like Catalysts Synthesized at Different pH Values for Styrene Oxidation

2020 ◽  
pp. 13-21
Author(s):  
Le Huy Tran ◽  
Thi Ngoc Mai Tran ◽  
Tuan Vu Anh ◽  
Pham Quoc Khanh ◽  
Thi Minh Thu Nguyen ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Styrene Oxidation ◽  
Preparation Conditions ◽  
Physico Chemical ◽  
Ph Conditions ◽  
Dichromate Anions ◽  
Co Precipitation ◽  
Styrene Conversion

Dichromate anions were intercalated between two consecutive hydroxide layers of [Mg0.6Al0.4(OH)2]0.40+ via co-precipitation at different pH conditions. The physico-chemical properties of the obtained solids were examined by physical methods such as X-ray diffraction (XRD), Infrared (IR), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) and Energy-Dispersive Spectroscopy (EDS). The experimental results indicated that the amount of dichromate anions in the catalysts varies with the pH media. Also, the morphology, structure and chemical composition of the materials depends strongly on the preparation conditions. The Mg-Al-Cr2O7 hydrotalcite-like compounds are used as heterogeneous catalysts for the styrene oxidation with H2O2 at mild conditions. The styrene conversion is about 20-50% while styrene selectivity remains rather high.

scholarly journals Zinc Oxide Synthesis from Extreme Ratios of Zinc Acetate and Zinc Nitrate: Synergistic Morphology

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 570
Author(s):  
Sujittra Kaenphakdee ◽  
Pimpaka Putthithanas ◽  
Supan Yodyingyong ◽  
Jeerapond Leelawattanachai ◽  
Wannapong Triampo ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Zinc Acetate ◽  
Near Infrared ◽  
Synergistic Effects ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Oxide Powders ◽  
Zno Powders

The synthesis of ZnO comprising different ratios of zinc acetate (ZA) and zinc nitrate (ZN) from the respective zinc precursor solutions was successfully completed via a simple precipitation method. Zinc oxide powders with different mole ratios of ZA/ZN were produced—80/1, 40/1, and 20/1. The crystallinity, microstructure, and optical properties of all produced ZnO powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis-NIR spectrophotometry. The average agglomerated particle sizes of ZnO-80/1, ZnO-40/1, and ZnO-20/1 were measured at 655, 640, and 620 nm, respectively, using dynamic light scattering (DLS). The optical properties of ZnO were significantly affected by the extreme ratio differences in the zinc precursors. ZnO-80/1 was found to have a unique coral-sheet structure morphology, which resulted in its superior ability to reflect near-infrared (NIR) radiation compared to ZnO-40/1 and ZnO-20/1. The NIR-shielding performances of ZnO were assessed using a thermal insulation test, where coating with ZnO-80/1 could lower the inner temperature by 5.2 °C compared with the neat glass substrate. Due to the synergistic effects on morphology, ZnO-80/1 exhibited the property of enhanced NIR shielding in curtailing the internal building temperature, which allows for its utilization as an NIR-reflective pigment coating in the construction of building envelopes.

scholarly journals Avrami behavior of magnetite nanoparticles formation in co-precipitation process

2011 ◽  
Vol 47 (2) ◽  
pp. 211-218 ◽  
Author(s):  
R. Ahmadi ◽  
Madaah Hosseini ◽  
A. Masoudi
Keyword(s):  
Magnetite Nanoparticles ◽  
Morphological Characterization ◽  
Precipitation Process ◽  
X Ray Diffraction ◽  
Nanoparticle Formation ◽  
Transmission Electron ◽  
Formation Behavior ◽  
Simplifying Assumptions ◽  
Co Precipitation ◽  
20 Nm

In this work, magnetite nanoparticles (mean particle size about 20 nm) were synthesized via coprecipitation method. In order to investigate the kinetics of nanoparticle formation, variation in the amount of reactants within the process was measured using pH-meter and atomic absorption spectroscopy (AAS) instruments. Results show that nanoparticle formation behavior can be described by Avrami equations. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were performed to study the chemical and morphological characterization of nanoparticles. Some simplifying assumptions were employed for estimating the nucleation and growth rate of magnetite nanoparticles.

Effect of h-BN on Sintering Behavior, Microstructures and Mechanical Properties of YAG Bulk Composites

2016 ◽  
Vol 697 ◽  
pp. 395-398 ◽  
Author(s):  
Shi Bin Li ◽  
Jie Guang Song ◽  
Hong Ying Ru ◽  
Xiao Bo Bai
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Precipitation Process ◽  
Sintering Behavior ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

The shell structure YAG composite powders with different volume fraction (15, 20 and 25vol%) micro h-BN have been prepared by co-precipitation process. The bulk composites were performed by pressure sintering at 1600°C under a pressure of 30MPa in vacuum. The mechanical properties (elastic modulus, hardness, and fracture toughness) and relative density of the composites were investigated detailedly. Furthermore, phase composition and microstructure of the composites were analyzed thoroughly by X-ray diffraction, scanning electron microscopy. Meanwhile, good machinability is maintained due to the low hardness of the second phase.

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