Synthesis of Zinc Oxide Colloidal Spheres by Sol-gel Method

2014 ◽  
Vol 70 (5) ◽  
Author(s):  
Sheen-Jeff Teh ◽  
Yew-Keong Sin ◽  
Kah-Yoong Chan ◽  
Tai-Wenn Law
Keyword(s):  
Thin Film ◽  
Particle Size ◽  
Zinc Oxide ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Colloidal Spheres ◽  
Near Ultraviolet

In this paper, zinc oxide (ZnO) colloidal spheres structures were prepared by sol-gel method which is simple, effective and less costly. The scanning electron microscopy (SEM) images illustrated the ZnO colloidal spheres structures with diameter size ranging between 200–700 nm. The particle size distribution of colloidal spheres was determined by the added amount of supernatant in dehydration process. 3 mL and 6 mL of added supernatant were resulted particle size distribution dominant in the range of 250–400 nm and 150–250 nm, respectively. Transmission spectra demonstrated the photonic band gap (PBG) of colloidal spheres prepared with different amounts of colloidal suspension coating sample were near ultraviolet and violet region. The thermal annealing process was introduced to narrow the PBG width of colloidal spheres based on Bragg’s law. Current-voltage measurement of ZnO colloidal spheres based thin film with particles size in the range of 150–250 nm showed that the resistivity of the thin film is 4.5 x 106 Ωcm.

Synthesis and properties of TiO2, NiO and ZnO nanoparticles and their possible biomedical application

2019 ◽  
Vol 2 (98) ◽  
pp. 81-84
Author(s):  
K. Szmajnta ◽  
M. Szindler
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Biomedical Application ◽  
Sol Gel ◽  
Scattering Method ◽  
Gel Method ◽  
Sol Gel Method

Purpose: The main purpose of this publication is to bring closer method of synthesis and examining basic properties of TiO2, ZnO and NiO nanoparticles (NPs), and investigate their possible biomedical application. Design/methodology/approach: Nanopowders were made with sol-gel method. Surface morphology studies of the obtained materials were made using Zeiss's Supra 35 scanning electron microscope and the structure using S/TEM TITAN 80-300 transmission electron microscope. In order to confirm the chemical composition of observed nanopowders, qualitative tests were performed by means of spectroscopy of scattered X -ray energy using the Energy Dispersive Spectrometer (EDS). The DLS (Dynamic Light Scattering) method was used to analyse the particle size distribution using the AntonPaar Litesizer 500 nanoparticle size analyser. Changes in particle size distribution at elevated temperatures were also observed. The TiO2, ZnO and NiO NPs with spherical shape were successfully produced by sol-gel method. Findings: The diameter of the as prepared nanoparticles does not exceed 25 nm which is confirmed by the TEM analysis. The highest proportion among the agglomerates of the nanoparticles has been shown to show those with a diameter of 80 to 125 nm. The qualitative analysis of EDS confirmed the chemical composition of the material. Practical implications: Nanoparticles (NPs) has been receiving an incrementally increasing interest within biomedical fields researchers. Nanoparticles properties (physical, chemical, mechanical, optical, electrical, magnetic, etc.) are different from the properties of their counterparts with a larger particle size. Originality/value: The nanoparticles were prepared using sol-gel method which allows the particle size to be controlled in a simple way.

Effects of Surfactants on Particle Size and Luminescence Properties of Ca1.98MgSiO5:Eu2+0.02 Phosphor Prepared by Sol-Gel Method

2013 ◽  
Vol 634-638 ◽  
pp. 2454-2457 ◽  
Author(s):  
Ying Xie ◽  
Gang Wang ◽  
Lin Jiu Xiao ◽  
Wen Ze Li ◽  
Yong Jie Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Sol Gel ◽  
Crystal Form ◽  
Luminescence Properties ◽  
Ammonium Bromide ◽  
Phosphor Particle ◽  
Gel Method ◽  
Sol Gel Method

Eu2+-doped Ca2MgSiO5 phosphors were prepared by sol-gel method. The effects of using surfactants (hexadecyl trimethyl ammonium bromide (CTAB) and triethanolamine) during the sol process were investigated on the phosphor particle size distribution. The use of surfactants did not change the crystal form of the Ca2MgSiO5:Eu2+ phosphor, but the particle size distribution and the luminescence properties were improved.

Characterization of Zirconia Sizing Nozzle Modifying Addictives Preparated by Sol-Gel Method

2014 ◽  
Vol 1078 ◽  
pp. 31-35
Author(s):  
Liang Zhao ◽  
Qun Hu Xue ◽  
Dong Hai Ding
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Composite Powders ◽  
Gel Method ◽  
X Ray

MgO-Al2O3-ZrO2composite powders with 3 kinds of mass ratio were synthesized by sol–gel method using MgCl2·6H2O, AlCl3·6H2O and ZrOCl2·8H2O as starting materials, and NH3·H2O as a precipitant. The composite powders which match with zirconium oxide particle size and evenly distribute can are advantageous to the formation of metastable t-ZrO2and restrain the grain growth as the additive of modified sizing nozzle. Chemical composition, mineral phase, particle size distribution and micro-morphology of the composite powders were investigated by X-ray fluorescence instrument, X-ray diffractometer, laser particle size analyzer and scanning electron microscope. Research showed that under the process that the concentration of MgCl2solution 0.2 mol/L, AlCl3and ZrOCl2solution concentration 0.5 mol/L, the pH controlled between 10 ~ 11, PEG as the surfactant, drying at 70°C±5°C, heat treatment temperature at 800°C for 3h, particle size distribution of MgO-Al2O3-ZrO2composite powders were: d10= 1.28 μm, d50= 4.65μm, d90= 11.13μm (MgO 10%); d10= 1.15μm, d50= 5.80μm, d90= 15.13μm (MgO 15%);d10= 1.21μm, d50= 6.59μm, d90= 16.87μm (MgO 20%). With the rising of heat treatment temperature, the crystallization degree of composite powders increased, at 800 °C a small amount of t - ZrO2precipitated, meanwhile MgO and Al2O3are still in the amorphous phase. The MgO-A12O3-ZrO2composite powders under this condition have high reactivity and uniform distribution.

Fabricating Multiple Channeled Zinc Oxide Thin Film Transistor Via Sol-Gel Method

2013 ◽  
Vol 50 (8) ◽  
pp. 107-111
Author(s):  
G.-Y. Chiou ◽  
S.-T. Liu ◽  
S.-Z. Chen ◽  
H. J. H. Chen
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Thin Film Transistor ◽  
Sol Gel ◽  
Oxide Thin Film ◽  
Zinc Oxide Thin Film ◽  
Gel Method ◽  
Sol Gel Method

Morphology and Optical Studies of (1-x)ZnAl2O4 – xSiO2 Thin Films Prepared by Sol-Gel Method

2014 ◽  
Vol 895 ◽  
pp. 63-68 ◽  
Author(s):  
Mohd Syafiq Zulfakar ◽  
Huda Abdullah ◽  
Wan Nasarudin Wan Jalal ◽  
Sahbudin Shaari ◽  
Zainuddin Zalita
Keyword(s):  
Thin Film ◽  
Particle Size ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Average Particle Size ◽  
Average Crystallite Size ◽  
Average Particle ◽  
Gel Method ◽  
Sol Gel Method

The effect of morphological structures and optical band gap of (1-x)ZnAl2O4xSiO2samples with compositions ofx= 0.00, 0.05, 0.10 and 0.15 were prepared by sol-gel method. Spin coating technique was used to deposited the (1-x)ZnAl2O4xSiO2as a thin film and to investigate the structural and optical band gap. The produced thin film samples were annealed at 450 °C for 1h. Field emission scanning electron microscope (FESEM) was used to investigate the surface morphology of the samples. The average particle size for (1-x)ZnAl2O4xSiO2is about 331.23 nm. The particle size are tend to increase as the composition of SiO2increased. XRD analysis shows the formation of cubic structure phase and dominant peak has been observed with Miller Indices (311) plane. The average crystallite size,Dwas calculated with average size about 8 13 nm. The optical band gap was calculated for (1-x)ZnAl2O4xSiO2samples and it was found within range of 3.34 to 3.94 eV.

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