Anatase Nano Titanium Oxide Synthesized Using the Hydrothermal Method and its Optical Absorption Properties

2011 ◽  
Vol 306-307 ◽  
pp. 1198-1202
Author(s):  
Xiao Ming Fu ◽  
Zhao Wen Liu
Keyword(s):  
Reaction Time ◽  
Optical Absorption ◽  
Hydrothermal Method ◽  
Titanium Oxide ◽  
Blue Shift ◽  
Absorption Peak ◽  
Absorption Properties ◽  
Ammonia Water ◽  
Oxide Particles ◽  
20 Nm

Anatase nano titanium oxide was synthesized with Ti(SO4)2 as titanium source and stronger ammonia water as precipitant using the hydrothermal method. The samples were characterized by XRD, SEM, TEM and UV-VIS. The results showed that the influence of the increase of the reaction time on as-prepared anatase nano titanium oxide was not obvious when stronger ammonia water was not added to Ti(SO4)2 solution. Anatase nano titanium oxide became small markedly under the same conditions when stronger ammonia water was added to Ti(SO4)2 solution. Anatase nano titanium oxide of about 20 nm in the diameter was obtained for 48 h with pH=9 at 240 °C by the hydrothermal method. That the size of Anatase nano titanium oxide particles became small was propitious to the blue shift of their absorption peak.

TiO2 Nanoparticles Synthesized with Ti(SO4)2 as Precursor via the Hydrothermal Method and their Optical Absorption Properties

2017 ◽  
Vol 727 ◽  
pp. 280-283
Author(s):  
Xiao Ming Fu
Keyword(s):  
Hydrothermal Method ◽  
Ph Value ◽  
Blue Shift ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Tem Analysis ◽  
Visible Absorption ◽  
Transmission Electron ◽  
20 Nm

Anatase TiO2 particles of about 20 nm in the diameter were successfully synthesized with Ti (SO4)2 as titanium source and stronger ammonia water as precipitant at 240°C for 48 h with pH=5 using the hydrothermal method. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and ultraviolet-visible absorption spectroscopy (UV-VIS). XRD analysis showed that the phase of the samples was anatase TiO2. TEM analysis confirmed that TiO2 particles of about 50 nm in the diameter were obtained when the pH value was 0.12. With the increasement of the pH value, the size of as-prepared TiO2 particles became remarkably fine. However, with the further increase of the pH value, the size of TiO2 particles was not obvious. TiO2 particles of about 20 nm in the diameter were obtained when the pH value was 5. And UV-VIS results showed that the size of anatase TiO2 nanoparticles, which became small, was propitious to the blue shift of their absorption peak.

The Hydrothermal Synthesis of ZrO2 Nanoparticles and their Optical Absorption Properties

2013 ◽  
Vol 873 ◽  
pp. 164-167
Author(s):  
Xiao Ming Fu
Keyword(s):  
Optical Absorption ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Tem Analysis ◽  
Visible Absorption ◽  
Ammonia Water ◽  
X Ray ◽  
Transmission Electron ◽  
Visible Absorption Spectroscopy

ZrO2 nanoparticles with a diameter range of less than 10 nm are successfully synthesized with zirconium nitrate as zirconium source and stronger ammonia water as precipitant at 210 °C for 48 h via the easy hydrothermal method. The phase, the morphologies and optical absorption properties of the samples have been characterized and analyzed by X-ray diffraction (XRD), field-emission transmission electron microscopy (TEM) and ultraviolet-visible absorption spectroscopy (UV-VIS), respectively. XRD analysis shows that the phase of as obtained samples is ZrO2. TEM analysis confirms that using stronger ammonia water as precipitant instead of NaOH and the increase of the reaction temperature are in favor of the synthesis of ZrO2 nanoparticles. And UV-VIS measurements show that ZrO2 nanoparticles have a good optical absorption property.

Preparation and Characterization of TiO2 Nanowire - Cu2O Nanocube Composite Thin Film

2013 ◽  
Vol 756 ◽  
pp. 37-42
Author(s):  
Fitri Yenni Naumar ◽  
Akrajas Ali Umar ◽  
Mohd Yusri Abd Rahman ◽  
Muhamad Mat Salleh ◽  
Marjoni Imamora Ali Umar ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Anatase Phase ◽  
Trisodium Citrate ◽  
Hybrid Structure ◽  
Alkaline Condition ◽  
Liquid Phase Deposition ◽  
Absorption Properties ◽  
20 Nm ◽  
Sds Surfactant

Composite of TiO2nanowire and Cu2O nanocube has been prepared. TiO2nanowire with ~240nm in thickness and 20 nm in length were synthesized by using liquid phase deposition(LPD) method at 50°C for 4h on ITO substrate. The anatase phase of TiO2nanowire was obtained by annealing the samples at 400°C for 1hin air. The Cu2O nanocubes were prepared by the reduction of Cu2+ions with ascorbic acid in the present of trisodium citrate and sodium dodecilsulfat (SDS) surfactant under an alkaline condition. The SDS addition was added with various concentrations namely 10 mM, 18 mM, and 26 mM during the Cu2O preparation for spin-coated onto TiO2nanowire at 3000 rpm for 30s. An optical property of TiO2Nanowire - Cu2O Nanocube has been characterized by UV-Vis spectroscopy.The original TiO2nanowire has single absorption peak at 318 nm, but it was shifted to 321 nm as Cu2O/SDS addition. A new peak at 440 nm was as the Cu2O nanocube absorption spectra. The Cu2O nanocube addition to the TiO2nanostructure film caused increase in the optical absorption of the system in the region 400 – 800 nm. We also studied the absorption properties of the hybrid system when Cu2O nanocube preparation under SDS condition. It was that found the increase in the SDS concentration has caused the optical absorption of the hybrid in this region decreased. This is believed due to the decrease of Cu2O nanocube size as the SDS concentration increase. This could be due to change in the TiO2nanowire-Cu2O nanocube hybrid-structure. This cooperate may find use in photoelectrochemical application.

EFFECTS OF PREPARATION PARAMETERS ON ONE-DIMENSIONAL CdS NANOSTRUCTURES BY DIPHENYLTHIOCARBAZONE-ASSISTED SOLVOTHERMAL METHOD

NANO ◽  
2012 ◽  
Vol 07 (02) ◽  
pp. 1250007 ◽  
Author(s):  
JING ZHOU ◽  
GAOLING ZHAO ◽  
BIN SONG ◽  
WEIXIA DONG ◽  
JINJIAN YANG ◽  
...  
Keyword(s):  
Reaction Time ◽  
Optical Absorption ◽  
Blue Shift ◽  
Controlled Growth ◽  
Single Crystalline ◽  
One Dimensional ◽  
Growth Regime ◽  
Kinetically Controlled ◽  
Cds Nanostructures ◽  
Cds Nanowires

One-dimensional (1D) single crystalline CdS nanostructures have been successfully synthesized via a diphenylthiocarbazone-assisted solvothermal route. The results revealed that the microstructure and optical absorption properties of 1D CdS nanostructures were temperature and time dependent owing to thermodynamically and kinetically controlled growth. Single crystalline CdS nanowires with a diameter of 80 nm and length of 20 μm were synthesized at 180°C for 96 h. At moderate temperature (180°C), the morphology of the products transformed from irregular short rods to uniform long rods as the reaction time prolonging in a kinetically controlled growth regime. Only nanorods were obtained at a temperature as low as 120°C even extending reaction time to 260 h due to thermodynamic limited growth. At high temperature (250°C in this system), the products were nanowires with larger diameter but lower aspect ratio since the growth rates on both lateral and axial directions were accelerated. Moreover, the optical absorption spectra revealed that the CdS nanowires showed a blue shift compared with bulk CdS. Two optical absorption peaks appeared due to the nanometer effect in the radial and lengthwise directions of CdS nanowires. The growth mechanism of 1D CdS nanostructures was discussed.

Synthesis of CuO Microspheres by the Simple Hydrothermal Method and their Optical Absorption Properties

2012 ◽  
Vol 562-564 ◽  
pp. 490-493
Author(s):  
Xiao Ming Fu
Keyword(s):  
Optical Absorption ◽  
Hydrothermal Method ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Visible Absorption ◽  
X Ray ◽  
Cuo Microspheres ◽  
Visible Absorption Spectroscopy

CuO microspheres with a diameter range of 1~3 μm are successfully synthesized with 1 m mol CuCl2 as copper source and 3 m mol Na2CO3 as auxiliary salt at 180 °C for 24 h via the easy hydrothermal method. The phase, the morphologies and optical absorption properties of the samples have been characterized and analyzed by XRD (X-ray diffraction), SEM (Scanning electron microscope) and ultraviolet-visible absorption spectroscopy (UV-VIS), respectively. XRD analysis shows that the phase of as obtained samples is CuO. SEM analysis confirms that the increase of the the auxiliary salt is in favor of the synthesis of CuO microrods. And UV-VIS measurements show that CuO microspheres have a good optical absorption property.

β-Ni(OH)2 Flower-Like Spheres and Nanoflakes Synthesized Using the Hydrothermal Method and its Formation Mechanism

2011 ◽  
Vol 306-307 ◽  
pp. 1430-1434
Author(s):  
Xiao Ming Fu ◽  
Zhao Wen Liu ◽  
Liang Yi Zhou ◽  
Chen Chen Xie
Keyword(s):  
High Temperature ◽  
Reaction Time ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Formation Mechanism ◽  
Phase Structure ◽  
Ph Value ◽  
Nickel Nitrate ◽  
Ammonia Water

β-Ni(OH)2 flower-like spheres and nanoflakes were synthesized with strong ammonia water as precipitator and nickel nitrate as nickel source by the hydrothermal method. The phase structure and morphologies were analyzed using XRD and SEM. The results showed that under the same conditions of the pH value and the reaction time, the low temperature was propitious to synthesize β-Ni(OH)2 flower-like spheres. High temperature was in favor of the synthesis of β-Ni(OH)2 nanoflakes. Namely, β-Ni(OH)2 flower-like spheres were obtained at 180 °C for 48.0 h with pH=9.0. β-Ni(OH)2 nanoflakes were prepared at 240 °C for 48.0 h with pH=9.0. The formation mechanism was explored through observing influence of the conditions of the hydrothermal method on the morphologies of the samples.

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

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