Microwave Hydrothermal Synthesis of Nanosize TiO2

Nanocrystalline titanium dioxide was synthesized by microwave hydrothermal (MH) using tetrabutyl titanate and normal butyl alcohol as start materials. The mixture solution of tetrabutyl titanate and normal butyl alcohol in 1:1.5 molar ratio was processed in a microwave hydrothermal digestion system at 200oC for 20 min to prepare nanosized TiO2 powders. The results showed that the microwave assisted reactions proceed at a faster rate than the traditional hydrothermal methods. The powder was heat treated at 500oC and the final products is ~20 nm in size and well dispersed.

Download Full-text

Synthesis and Characterization of Nanocrystalline Anatase by Microwave Hydrothermal Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.500.104 ◽

2012 ◽

Vol 500 ◽

pp. 104-107

Author(s):

Zhi Qin Chen ◽

Xiang Liang Chen ◽

Shu Juan Zhang ◽

Jun Xi Hu ◽

Wen Kui Li

Keyword(s):

Hydrothermal Method ◽

Average Particle Size ◽

Butyl Alcohol ◽

Molar Ratio ◽

Tetrabutyl Titanate ◽

Average Particle ◽

Synthesis Conditions ◽

Microwave Hydrothermal ◽

Microwave Hydrothermal Method

Uniform nanocrystalline pure anatase has been synthesized and characterized using tetrabutyl titanate aqueous solution as starting precursors by microwave hydrothermal method. The influences of synthesis conditions (reaction time and temperature) on the formation, crystal phase and crystallite size of TiO2has been investigated. A mixture solution of tetrabutyl titanate and normal butyl alcohol in 1:4 molar ratio is processed in a microwave hydrothermal autoclave at low temperature 120°C for different durations, at 200°C for 20 min to precipitate titania powders, respectively. It was revealed that uniformly dispersed and granulous single phase anatase prepared at 120°C for 180 min with the average particle size of 10 nm was formed by means of XRD and TEM.

Download Full-text

Microwave Hydrothermal Preparation of Uniform Nanocrystalline Anatase

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.177.357 ◽

2010 ◽

Vol 177 ◽

pp. 357-360 ◽

Cited By ~ 4

Author(s):

Zhi Qin Chen ◽

Wei Jun Zeng ◽

Wen Kui Li ◽

Ze Hua Zhou ◽

Hong Ying Yu

Keyword(s):

Low Temperature ◽

Continuous Process ◽

Butyl Alcohol ◽

Irradiation Condition ◽

Tetrabutyl Titanate ◽

Hydrothermal Preparation ◽

Microwave Hydrothermal ◽

Average Grain Size ◽

Short Time ◽

Lower Production

The synthesis of nanocrystalline pure anatase at low temperature and short time is not an easy achievement, as the synthetic processes generally lead to amorphous, moreover some processes normally require harsh reaction. Uniform nanocrystalline pure anatase has been obtained using tetrabutyl titanate and normal butyl alcohol under microwave irradiation condition at low temperature 120 °C for 3 h. This process simplication will lower production cost and make continuous process possible. It was revealed that the as-synthesized TiO2 products without any heat treatment were uniformly dispersed and granulous single-phase anatase, with the average grain size of 10 nm, by means of XRD and TEM.

Download Full-text

ANALYSIS OF THE BEHAVIOR OF MESOPOROUS ANATASE NANOCRYSTALLINE TITANIUM DIOXIDE FILMS APPLIED TO DYE-SENSITIZED SOLAR CELLS

Special Topics & Reviews in Porous Media An International Journal ◽

10.1615/specialtopicsrevporousmedia.v2.i2.10 ◽

2011 ◽

Vol 2 (2) ◽

pp. 73-81

Author(s):

D. A. Barros Filho ◽

H. R. Lewgoy ◽

R. Amore ◽

A. Anido-Anido ◽

C. Anauate-Netto ◽

...

Keyword(s):

Titanium Dioxide ◽

Solar Cells ◽

Dye Sensitized Solar Cells ◽

Titanium Dioxide Films ◽

Dye Sensitized ◽

Nanocrystalline Titanium ◽

Nanocrystalline Titanium Dioxide ◽

Sensitized Solar Cells

Download Full-text

Nanozirconium Carbide Powder Synthesis via Carbothermal Route

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.334-335.381 ◽

2013 ◽

Vol 334-335 ◽

pp. 381-386 ◽

Cited By ~ 2

Author(s):

F. Arianpour ◽

F. Kazemi ◽

Hamid Reza Rezaie ◽

A. Asjodi ◽

J. Liu

Keyword(s):

Carbon Sources ◽

Zirconium Carbide ◽

Carbide Powder ◽

Carbide Formation ◽

Matrix Composites ◽

Powder Synthesis ◽

High Refractoriness ◽

Heat Treated ◽

Crystallite Sizes ◽

20 Nm

Zirconium carbide (ZrC) has extended application in many ceramic and metal matrix composites especially used for ultra high temperature conditions. The synthesis of zirconium carbide powder is costly and difficult because of its high refractoriness and chemically inert properties. In this research, the synthesis of zirconium carbide nanopowder at low temperature via carbothermal reduction route was investigated according to thermodynamic data. The starting materials were zirconium acetate and sucrose as zirconium and carbon sources, respectively. After preparation of different carbon/zirconium ratio containing precursors, the dried precursors were heat treated at 1400°C and vacuum atmosphere. Also the ZrC formation was followed by thermal analysis of the produced precursors. The phase evolutions and microstructural studies were carried out using X-ray diffraction and scanning electron microscopy. The results showed that it is possible to synthesis zirconium carbide nanopowder with round shape and crystallite sizes smaller than 20 nm at low temperatures. Also according to thermodynamic calculations, it was concluded that by applying vacuum condition, the zirconium carbide formation can occur at less than 1000°C which is very effective on the size reducing of produced ZrC nanopowders.

Download Full-text

Low-temperature route to nanoscale P3N5 hollow spheres

Journal of Materials Research ◽

10.1557/jmr.2003.0330 ◽

2003 ◽

Vol 18 (10) ◽

pp. 2359-2363 ◽

Cited By ~ 23

Author(s):

Hongzhou Gu ◽

Yunle Gu ◽

Zhefeng Li ◽

Yongcheng Ying ◽

Yitai Qian

Keyword(s):

Photoelectron Spectroscopy ◽

Hollow Spheres ◽

Molar Ratio ◽

Visible Absorption ◽

X Ray ◽

Transmission Electron ◽

Influence Of Temperature On ◽

Wide Gap ◽

20 Nm ◽

High Degree

Nanoscale hollow spheres of amorphous phosphorus nitride (P3N5) were synthesized by reacting PCl3 with NaN3 at 150–250 °C. Transmission electron microscope images show that the hollow spheres have a diameter of 150–350 nm, and the thickness of the shell is 20 nm. A very small amount of curly films were also found in the sample prepared at 150 °C. The infrared spectrum indicates a high degree of purity. X-ray photoelectron spectroscopy indicates the presence of P and N, with a molar ratio of 1:1.62 for P:N. Ultraviolet-visible absorption spectroscopy shows an absorption band at 265–315 nm. Under photoluminescent excitation at 230 nm, the P3N5 emits ultraviolet light at 305 nm. With a band gap of 4.28 eV, the products may be a wide gap semiconductor. A possible mechanism and the influence of temperature on the formation of the hollow spheres are also discussed.

Download Full-text

One Step Microwave-Assisted Synthesis of Fluorinated Titania Photocatalyst

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.670.177 ◽

2015 ◽

Vol 670 ◽

pp. 177-182

Author(s):

Alexey A. Sadovnikov ◽

Alexander E. Baranchikov ◽

Vladimir Kozik ◽

Lyudmila P. Borilo ◽

Sergey A. Kozyukhin ◽

...

Keyword(s):

Ammonium Fluoride ◽

Organic Dye ◽

Microwave Assisted Synthesis ◽

Dye Sensitized ◽

Microwave Assisted ◽

One Step ◽

Nanocrystalline Titanium ◽

Nanocrystalline Titanium Dioxide ◽

Titania Photocatalyst ◽

Hydrolysis Of

Microwave-assisted high temperature hydrolysis of titanium oxysulfate, in the presence of ammonium fluoride, allows synthesizing nanocrystalline titanium dioxide photocatalysts possessing photocatalytic activity as high as the commercial photocatalyst Evonik Aeroxide® TiO2 P 25. Dye-sensitized reactions play an important role in organic dye discoloration in the presence of fluorinated titania.

Download Full-text