Preparation and Characterization of Nano-Porous SiO2/TiO2-SiO2 Thin Films on Glass Substrates by Sol-Gel Method

2012 ◽  
Vol 531-532 ◽  
pp. 651-654
Author(s):  
Qing Nan Zhao ◽  
Ying Liu ◽  
Shao Hong Hou ◽  
Wu Zeng ◽  
Jie Sun
Keyword(s):  
Surface Morphology ◽  
Raw Materials ◽  
Sol Gel ◽  
Amorphous Structure ◽  
Tetrabutyl Titanate ◽  
Ammonium Bromide ◽  
Gel Method ◽  
Sol Gel Method ◽  
Glass Substrates ◽  
Cetyl Trimethyl Ammonium

Nano-porous bilayers structure antireflection films on glass substrate were prepared by sol-gel method, tetraethyl orthosilicate(TEOS) and tetrabutyl titanate(TEOT) as the main raw materials, cetyl trimethyl ammonium bromide(CTAB) and polyethylene glycol(PEG) as template. The relation of the template agent addition, pH, and aging time to surface morphology and optical properties were analyzed. When the CTAB/TEOS = 1/30, the average spectral transmittance in the visible wavelength is 93.69% and the peak transmission is up to 97.37%. All the bilayers antireflection films are amorphous structure, uniform surface morphology, dense nano-porous size distribution, pore size is about 10nm.

Enhanced Photocatalytic Activity of TiO2/Graphene Oxide Nanocomposites Prepared by the Sol-Gel Method

2013 ◽  
Vol 302 ◽  
pp. 176-181 ◽  
Author(s):  
Chun Hua Cao
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Graphite Oxide ◽  
Raw Materials ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Tetrabutyl Titanate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transmission Electron

TiO2/graphene oxide (TiO2/GO) nanocomposites were prepared by the sol-gel method using tetrabutyl titanate and graphite oxide as the main raw materials. The microstructure of TiO2/GO nanocomposites was analyzed by X-ray diffraction and transmission electron microscopy. The results showed that graphene oxide was uniformly covered with sphere-like anatase TiO2 nanoparticles, which had a diameter of about 10 nm. Reactive brilliant red X-3B (X-3B) was used as model pollutant to study the photocatalytic activity of the composites. The effect of key factors on X-3B degradation was investigated. The results indicated that the photocatalytic activity of TiO2/GO nanocomposites was higher than that of pure TiO2 and the mixture of TiO2 and graphite oxide under the same conditions, and the nanocomposites had the best photocatalytic activity, when the content of graphene oxide was 100 mg. Moreover, it was found that the rate of photocatalytic degradation decreased with the increase of the initial dye concentration, and the optimum amount of nanocomposites was 0.8g/L when the initial concentration of X-3B solution was 100 mg/L, and the degradation rate could reach 96% after 60 min irradiation.

scholarly journals Characteristics of Nanosize Spinel NixFe3-xO4 Prepared by Sol-Gel Method Using Egg White as Emulsifying Agent

2015 ◽  
Vol 15 (2) ◽  
pp. 116-122 ◽  
Author(s):  
Rudy Situmeang ◽  
Sukma Wibowo ◽  
Wasinton Simanjuntak ◽  
R. Supryanto ◽  
Rizki Amalia ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Raw Materials ◽  
Sol Gel ◽  
Egg White ◽  
Acid Sites ◽  
Homogeneous Surface ◽  
Gel Method ◽  
Sol Gel Method ◽  
Emulsifying Agent ◽  
Materials Used

In this study, sol-gel method using egg white as emulsifying agent was applied to prepare nano size spinel NixFe3-xO4 (with x = 0.2–1). Sample preparation was carried out by mixing the solution of Fe(NO3)3.9 H2O and Ni(NO3)3.6 H2O with egg white, and then the sample was stirred thoroughly using magnetic stirrer. After freeze–drying process, the sample was subjected to calcination treatment and subsequently characterized. The phase composition was evaluated using the X-ray diffraction (XRD) technique, followed by quantitative analysis using Rietveld and Debye-Scherrer Methods. The functionality of the sample was identified using Fourier Transform Infrared (FTIR) spectroscopy, and surface morphology and elemental composition were analyzed using scanning electron microscopycoupled with electron dispersive spectroscopy (SEM/EDS). The results of XRD characterization indicated that materials consist of various crystalline phases, with NiFe2O4 as a major phase. FTIR Analysis revealed the existence of both Lewis and Brønsted–Lowry acid sites, with Lewis acid as the prominent site. The sample was found to display relatively homogeneous surface morphology, having the crystallite size in the range of 33 to 61 nm according to the Debye-Scherrer equation. The EDS data indicated that the ratio of Fe/Ni is in agreement with the composition of the raw materials used.

Visible-Light Activity Evaluation of p-n Junction Photocatalyst NiO/TiO2 Prepared by Sol-Gel Method

2010 ◽  
Vol 152-153 ◽  
pp. 441-449 ◽  
Author(s):  
Wei Liu ◽  
Shi Fu Chen
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Oxidation ◽  
Raw Materials ◽  
Sol Gel ◽  
Visible Region ◽  
Tetrabutyl Titanate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Light Activity

P-N junction photocatalyst NiO/TiO2 photoexcited by visible light was prepared by sol-gel method using Ni(NO3)2•6H2O and tetrabutyl titanate [Ti(OC4H9)4] as the raw materials. The p-n junction photocatalyst NiO/TiO2 was characterized by UV-Vis diffuse reflection spectrum, fluorescence spectra (FL), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). UV-Vis spectrum showed that the absorption wavelength range of NiO/TiO2 is extended to the visible region, making it an effective photocatalyst photoexcited by visible light. This was demonstrated by photocatalytic reduction of Cr2O72- and photocatalytic oxidation of methyl orange (MO) under visible-light (λ>400 nm) irradiation. Doped-NiO effectively suppressed the phase transformation of anatase to rutile and the growth of titania crystallites. The optimum percentage of doped NiO is 0.5% (mole ratio of Ni/Ti). Effects of heat treatment on the photocatalytic activity of p-n junction photocatalyst NiO/TiO2 were investigated. The mechanisms of influence on the photocatalytic activity were also discussed by the p-n junction principle.

Microstructural, Optical and Electrical Properties of ZnO:Sn Thin Films Deposited by Sol-Gel Method

2013 ◽  
Vol 652-654 ◽  
pp. 519-522
Author(s):  
Jun Chen ◽  
Yue Hui Hu ◽  
Hong Hao Hu ◽  
Yi Chuan Chen
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Sol Gel ◽  
Hexagonal Structure ◽  
Optical And Electrical Properties ◽  
Axis Orientation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sn Doping ◽  
Glass Substrates

Transparent thin films of Sn-doped ZnO (ZnO:Sn) were deposited onto silica glass substrates by the sol–gel method. The effect of different Sn doping on the crystallinity, structural, optical and electrical properties of ZnO:Sn thin films were investigated by XRD, SEM, UV-VIS spectrophotometer and four-point probe method respectively. Among all of ZnO:Sn thin films in this paper, Sn-doped with 2 at.% exhibited the best properties, the surface demonstrate an accumulative crystallization and hexagonal structure, with a high-preferential c-axis orientation, namely an average transmittance of 90% and the resistivity of 19.6 Ω·cm.

Magnetic Properties of Bulk Zn0.95-XMnXFe0.05O2 Prepared by Sol-Gel Method and Subsequent Hot Pressing

2011 ◽  
Vol 268-270 ◽  
pp. 356-359 ◽  
Author(s):  
Wen Song Lin ◽  
C. H. Wen ◽  
Liang He
Keyword(s):  
Magnetic Properties ◽  
Photoelectron Spectroscopy ◽  
Raw Materials ◽  
Sol Gel ◽  
Secondary Phase ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Doped Zno

Mn, Fe doped ZnO powders (Zn0.95-xMnxFe0.05O2, x≤0.05) were synthesized by an ameliorated sol-gel method, using Zn(CH3COO)2, Mn(CH3COO)2and FeCl2as the raw materials, with the addition of vitamin C as a kind of chemical reducer. The resulting powder was subsequently compacted under pressure of 10 MPa at the temperature of 873K in vacuum. The crystal structure and magnetic properties of Zn0.95-xMnxFe0.05O2powder and bulk samples have been investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). X-ray photoelectron spectroscopy (XPS) was used to study chemical valence of manganese, iron and zinc in the samples. The x-ray diffraction (XRD) results showed that Zn0.95-xMnxFe0.05O (x≤0.05) samples were single phase with the ZnO-like wurtzite structure. No secondary phase was found in the XRD spectrum. X-ray photoelectron spectroscopy (XPS) showed that Fe and Mn existed in Zn0.95-xMnxFe0.05O2samples in Fe2+and Mn2+states. The results of VSM experiment proved the room temperature ferromagnetic properties (RTFP) of Mn, Fe co-doped ZnO samples.

Synthesis of Aluminum Titanate Powder at Low Temperature via Nonhydrolytic Sol-Gel Method by Using Aluminum Powder

2013 ◽  
Vol 745-746 ◽  
pp. 673-678 ◽  
Author(s):  
Wei Hui Jiang ◽  
Zhi Fang Xu ◽  
Jian Min Liu ◽  
Qing Xia Zhu ◽  
Quan Zhang
Keyword(s):  
Low Temperature ◽  
Aluminum Powder ◽  
Raw Materials ◽  
Sol Gel ◽  
Aluminum Titanate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transmission Electron ◽  
Oxygen Donor ◽  
Metal Aluminum

Aluminum titanate (Al2TiO5) powder has been synthesized at low temperature via nonhydrolytic sol-gel method by using aluminum powder as aluminum source, titanium tetrachloride as titanium source, anhydrous ethanol as oxygen donor with different catalysts. The phase transformation of aluminum titanate xerogel powder during heat treatment and the influence of the mixing orders of raw materials, catalyst kinds on the synthesis of aluminum titanate were investigated by means of differential-thermal analysis (DTA-TG), X-ray diffraction (XRD), transmission electron microscope (TEM). The results indicated that aluminum titanate powder was easily synthesized at 750 °C by using AlCl3 as catalyst with a mixing order of adding TiCl4 before AlCl3 into aluminum alcohol mixture. The catalytic order of the different catalysts in the preparation process of aluminum titanate is: FeCl3> AlCl3> MgCl2. The catalyst promoted the activation of metal aluminum powder and played a major role in the synthesis of aluminum titanate powder at low temperature via nonhydrolytic sol-gel method.

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