scholarly journals Photocatalytic Properties of Size-Controlled Titania Nanotube Arrays

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Takeshi Hashishin ◽  
Keisuke Misawa ◽  
Kazuo Kojima ◽  
Chihiro Yogi ◽  
Jun Tamaki
Keyword(s):  
Crystallite Size ◽  
Rate Constant ◽  
Apparent Rate Constant ◽  
Anatase Phase ◽  
Ultra Violet ◽  
Tube Length ◽  
Nanotube Arrays ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Inner Diameter

The titania nanotube arrays (TNAs) with smooth surface was synthesized by anodization of titanium foil with 3 cm2in square area using the electrolyte composed of 0.2 wt% NH4F and 0.5 vol% H2SO4in ethylene glycol in order to evaluate the methylene blue photodegradation under ultra-violet irradiation. The tube length and inner diameter as a size parameter were controlled by the anodization time from 5 to 10 h and applied voltage from 10 to 50 V. The titania nanotube arrays (TNAs) annealed at 300 to 500°C were assigned to anatase phase, and TNAs at 600°C had both phase of anatase and rutile. The crystallite size and the apparent rate constant were increased with the increase in the annealing temperature of TNAs from 300 to 500°C. The bigger crystallite size of TNAs is suggested to be related to the increase in the amount of hole at the valence band, leading to the decrease in the apparent rate constant of MB degradation. Interestingly, the four kinds of linear relationship with the apparent rate constant were seen in both the inner diameter of TNAs and the length. Consequently, the apparent rate constant strongly depended on inner diameter of TNAs.

Electrochemical Fabrication and Characterization of Highly-Ordered Titania Nanotube Arrays

2010 ◽  
Vol 148-149 ◽  
pp. 1600-1606
Author(s):  
Hai Tao Zhang ◽  
Xiang Yun Deng ◽  
Xin Zheng Wu ◽  
Ri Ke Chen
Keyword(s):  
Ph Value ◽  
Anatase Phase ◽  
Nanotube Arrays ◽  
Cyclic Voltammogram ◽  
X Ray Diffraction ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Anodic Voltage ◽  
Electrochemical Fabrication

Highly-ordered titania nanotube arrays were fabricated in ethylene glycol polar organic electrolyte containing a certain amount of sodium fluoride. Series of patterned nanotube arrays with different outside diameter and aspect ratio were obtained via optimizing anodic voltage, the concentration of fluoride ion and reaction time. The as-prepared nanotube arrays were amorphous and transformed single anatase phase characterized by X-ray diffraction with annealing under the condition of 450oC for 3h. Cyclic voltammogram behaviors were discussed using electrochemical workstation. The pH value of electrolyte, the scanning rate, the crystal structure and morphology of the samples have a significant effect on the reductive/oxidative and H+ intercalation properties.

Preparation and Capacitance Properties of Titania Nanotube Arrays

2010 ◽  
Vol 148-149 ◽  
pp. 912-915
Author(s):  
Yi Bing Xie
Keyword(s):  
Pore Size ◽  
Specific Capacitance ◽  
Small Degree ◽  
Tube Length ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Titania Nanotube Arrays ◽  
Double Layer Capacitor ◽  
Capacitance Performance ◽  
Titania Nanotube

The well-defined titania nanotube arrays with a tunable pore size and tube length have been fabricated in an organic medium-assisted anodization process. The obtained titania nanotubes have been applied for electric double layer capacitor applications. The electrochemical capacitance performance is highly dependent on the pore size and tube length of nanotube arrays. The increase of pore size can significantly enhance specific capacitance of titania nanotube arrays. Comparatively, the increase of tube length can only improve specific capacitance to a small degree. In addition, a higher specific capacitance of titania nanotube array can be achieved in an acidic solution rather than an alkali solution.

Fabrication of Self-Organized TiO2 Nanotubes by Anodization and its Photocatalytic Properties

2011 ◽  
Vol 322 ◽  
pp. 209-212
Author(s):  
Tian Yu Wu ◽  
Xin Tan ◽  
Juan Ru Huang ◽  
Tao Yu ◽  
Lin Zhao
Keyword(s):  
Apparent Rate Constant ◽  
Photocatalytic Performance ◽  
Anatase Phase ◽  
Order Reaction ◽  
Nanotube Arrays ◽  
Photocatalytic Reaction ◽  
First Order ◽  
Self Organized ◽  
Titania Nanotube Arrays ◽  
Good Agreement

Titania nanotube arrays(TNT) was extensively studied due to its good photocatalytic activity. This article focused on the fabrication of highly ordered TNTs. TNTs were fabricated in an electrolyte of ethylene glycol(EG), water and NH4F for 1, 2, 3, 4h and then annealed at 400°C. The influence of anodic time on the morphology and photocatalytic performance of TNT was investigated. The results indicated that the TNT could be successfully fabricated by using the electrolyte, and the diameter and length of TNT were about approximately 140nm, 5-13μm, separately. Furthermore, the results also showed anatase phase was dominant, TNT with good morphology displayed good photocatalitic properties. When the initial concentration of Rhodamine B(RhB) was 7×10−6mol﹒L−1, the removal of RhB reached 88.1% by TNT anodized for 2h with length of 9.5μm. In addition, the results showed that the photocatalytic reaction fitting the first-order reaction in good agreement with the literature, and the apparent rate constant(kapp) was 0.0251 min-1(the length of 9.5μm)．

Gold Nanoparticles Modified Titania Nanotube Arrays for Amperometric Determination of Ascorbic Acid

2010 ◽  
Vol 43 (18) ◽  
pp. 2809-2822 ◽  
Author(s):  
T. G. Satheesh Babu ◽  
P. V. Suneesh ◽  
T. Ramachandran ◽  
Bipin Nair
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Nanotube Arrays ◽  
Amperometric Determination ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube

Effects of Synthesis Parameters on Controllable Growth of Highly-Ordered TiO2 Nanotube Arrays

2011 ◽  
Vol 284-286 ◽  
pp. 791-795 ◽  
Author(s):  
Shi Pu Li ◽  
Shi Wei Lin ◽  
Jian Jun Liao ◽  
Dan Hong Li ◽  
Yang Cao ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Nanotube Arrays ◽  
Mixed Electrolyte ◽  
Preparation Conditions ◽  
Photoelectrical Properties ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Controllable Growth ◽  
Polishing Fluid ◽  
Abrasive Paper

Titania nanotube arrays were fabricated in deionize water and glycerol mixed electrolyte containing a certain amount of NH4F. Three different polishing methods were used for pretreatment of Ti substrates: polished by hand with abrasive paper, by polishing machine, or by chemical polishing fluid (HF:HNO3=1:4, in volumetric ratio). The morphology of three different samples were imaged by scanning electron microscopy, and their photoelectrical properties were studied as well. Experimental results showed that Titania nanotube arrays grown on the Ti substrate and polished by polishing fluid has highly-ordered and well-defined nanotube structure. The effects of anodization potential and duration on synthesis of highly-ordered TiO2nanotubes were also studied in this paper. Both the layer thickness and nanotube diameter linearly increase with the increasing potential. The layer thickness also increases with prolongation of anodization time. By optimizing the preparation conditions, we can successfully control the geometrical structure of TiO2nanotube arrays with diameters in the range between 50 and 200 nm and the layer thickness between 800 and 2000 nm.

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