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.

Mössbauer Investigation of γ-Fe2O3 Nanocrystals in Silica Matrix Prepared by the Sol-gel Method

2002 ◽  
Vol 57 (3-4) ◽  
pp. 154-158 ◽  
Author(s):  
C. Cannas ◽  
G. Concas ◽  
F. Congiu ◽  
A. Musinu ◽  
G. Piccaluga ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Sol Gel ◽  
Average Particle Size ◽  
Volume Ratio ◽  
Silica Matrix ◽  
Blocking Temperature ◽  
Average Particle ◽  
Gel Method ◽  
Sol Gel Method

A series of Fe2O3-SiO2 nanocomposites (25 weight % of Fe2O3) has been prepared using a sol-gel method. Samples showing different features were obtained by varying the evaporation conditions acting on the surface / volume ratio of the starting sol. The samples were investigated using Mössbauer spectroscopy at low temperature. The Fe2O3 nanoparticles have been identified as maghemite ( γ-Fe2O3) particles. The samples show a superparamagnetic behavior with a blocking temperature that depends on the average particle size.

Blueshift in optical band gap in nanocrystalline Zn1−xCaxO films deposited by sol-gel method

2009 ◽  
Vol 95 (3) ◽  
pp. 031901 ◽  
Author(s):  
Kamakhya Prakash Misra ◽  
R. K. Shukla ◽  
Atul Srivastava ◽  
Anchal Srivastava
Keyword(s):  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method

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.

Properties of TiO2 Thin Film Prepared by Sol-Gel Dip Coating

2015 ◽  
Vol 723 ◽  
pp. 528-531
Author(s):  
Jun Wang ◽  
Ling Yun Bai
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Dip Coating ◽  
Gel Method ◽  
Glass Substrates

TiO2 thin films were prepared on glass substrates by sol-gel method. The effect of withdraw speed on the thickness and optical properties of TiO2 thin films was investigated. The films were transparent in the visible wavelength. The thickness of the TiO2 films was increased from 90 nm for the withdraw speed of 1000 μm/s to 160 nm for the withdraw speed of 2000 μm/s. While, The refractive index of the TiO2 thin film decreased from 2.38 to 2.07. It may be due to the porosity of the film was increased. The optical band-gap of the films was around 3.45 eV.

scholarly journals Li Conductivity of Nanocrystalline Li4Ti5O12 Prepared by a Sol-Gel Method and High-Energy Ball Milling

2009 ◽  
Vol 289-292 ◽  
pp. 565-570 ◽  
Author(s):  
W. Iwaniak ◽  
J. Fritzsche ◽  
M. Zukalová ◽  
R. Winter ◽  
Martin Wilkening ◽  
...  
Keyword(s):  
Particle Size ◽  
Crystallite Size ◽  
Sol Gel ◽  
High Energy ◽  
Average Particle ◽  
Li Ion Batteries ◽  
Gel Method ◽  
Sol Gel Method ◽  
Li Ion ◽  
20 Nm

Spinel-type structured Li4+xTi5O12 (0 6 x 6 3 ) is actually one of the most promising anode materials for Li ion batteries. In its nanostructured form it is already used in some commercially available Li ion batteries. As was recently shown by our group (Wilkening et al., Phys. Chem. Chem. Phys. 9 (2007) 1239), Li diffusivity in microcrystalline Li4+xTi5O12 with x = 0 is rather slow. In the present contribution the Li conductivity in nanocrystalline samples of the electronic insulator Li4Ti5O12 prepared by different routes is investigated using impedance spectroscopy. The mean crystallite size of the samples is about 20 nm. The ionic conductivity of nanocrystalline Li4Ti5O12 obtained by mechanical treatment is higher by about two orders of magnitude compared to that found for a material which was prepared following a sol-gel method. The latter resembles the behaviour of the microcrystalline sample with an average particle size in the μm range rather than that of a nanocrystalline ball milled one with a mean crystallite size of about than 20 nm. The larger conductivity of the ball milled sample is ascribed to a much higher defect density generated when the particle size is reduced mechanically.

Barium Zirconium Titanate Powders Prepared by Sol–Gel Method

2011 ◽  
Vol 412 ◽  
pp. 86-89 ◽  
Author(s):  
Xiao Ling Deng ◽  
Dong Jiao Guo ◽  
Wei Cai ◽  
Chun Lin Fu
Keyword(s):  
Sol Gel ◽  
Average Particle Size ◽  
Average Particle ◽  
Gravimetric Analysis ◽  
Zirconium Titanate ◽  
Thermal Gravimetric ◽  
Gel Method ◽  
Sol Gel Method ◽  
Barium Zirconium Titanate ◽  
Xrd Patterns

Barium zirconium titanate, Ba (Zr0.20Ti0.80)O3(BZT) powders were prepared by sol-gel method. These powders were characterized by thermal gravimetric and differential thermal gravimetric analysis (TG-DTA), X-ray diffraction (XRD). The grain size and lattice constant were determined. The decomposition of the precursors was monitored by TG-DTA. XRD patterns reveal that BZT powders heat-treated at 800°C present single phase with perovskite type cubic structure. The average particle size of the BZT powders is about 25 nm.

scholarly journals Structure and dielectric behaviour of Sr-modified Bi4Si3O12 thin films prepared via sol gel method

2018 ◽  
Vol 12 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Abbas Sadeghzadeh-Attar ◽  
Saeid Hajijafari-Bidgoli ◽  
Mohammad Bafandeh
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Dielectric Loss ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Average Particle Size ◽  
Average Particle ◽  
Sem Images ◽  
Gel Method ◽  
Sol Gel Method

Bismuth silicate (Bi4Si3O12, BSO) nanostructured films containing 0,1,2, and 3mol% Sr were prepared via sol-gel method and annealed at different temperatures up to 700?C. The effects of Sr content on the structure and morphology of prepared films were investigated. SEM images showed that surfaces of the prepared films were dense, smooth and homogeneous. The average particle size was changed from 30 to 35 nm as the annealing temperature was increased from 500 to 700?C. Variation of the dielectric constant and dielectric loss as a function of frequency and annealing temperature for the synthesized thin films with different content of Sr were also studied. The dielectric constant and dielectric loss decrease with Sr addition, and reach the minimum for the sample containing 2mol% Sr. These changes could be attributed to the crystal structure and formation of secondary phases.

Synthesis and Characterization of Nanosized ZrTiO4 Powders Prepared by the Sol-Gel Method

2006 ◽  
Vol 530-531 ◽  
pp. 401-407 ◽  
Author(s):  
I.C. Cosentino ◽  
F.M. Vichi ◽  
E.N.S. Muccillo ◽  
R. Muccillo
Keyword(s):  
Mercury Porosimetry ◽  
Sol Gel ◽  
Average Particle Size ◽  
Nitrogen Adsorption ◽  
Zirconium Oxychloride ◽  
Average Particle ◽  
Titanium Tetraisopropoxide ◽  
Nanosized Powders ◽  
Gel Method ◽  
Sol Gel Method

Ceramic ZrTiO4 powders were prepared by a modified sol-gel method using zirconium oxychloride and titanium tetraisopropoxide. In situ high temperature X-ray diffraction results show that crystallization of the amorphous gel starts at 400 °C. Singlephase ZrTiO4 nanoparticles were obtained after heat treatment at 450 oC for 1 h. An average particle size of 46 nm has been determined by nitrogen adsorption analysis. After pressing these sinteractive powders, pellets with controlled pore size distribution were obtained by sintering at temperatures as low as 400 oC. The analysis of pores by mercury porosimetry shows an average porosity of 45 %. Pressing and sintering the nanosized powders prepared by that modified sol-gel technique produced pellets that are good candidates to be used in humidity sensing devices.

scholarly journals Synthesis, characterization and optical band gap of Pirochromite (MgCr2O4) Nanoparticles by Stearic Acid Sol-Gel Method

2016 ◽  
pp. 173-180 ◽  
Author(s):  
Ehsan Jafarnejad ◽  
Salah Khanahmadzadeh ◽  
Fatemeh Ghanbary ◽  
Morteza Enhessari
Keyword(s):  
Stearic Acid ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method
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