Fabrication and Photoelectrochemical Properties of Self-Organized Mixed Oxide Nanotubes by Anodization of Ti-2Al-1.5Mn Alloy

2011 ◽  
Vol 219-220 ◽  
pp. 1333-1336 ◽  
Author(s):  
Shi Kai Liu ◽  
Yan Tao Li ◽  
Hai Bin Yang ◽  
Wen Jun Zou ◽  
Zheng Xin Li
Keyword(s):  
Mixed Oxide ◽  
Visible Region ◽  
Ammonium Fluoride ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
Self Organized ◽  
Photoelectrochemical Response ◽  
Ion Doping ◽  
Application Prospects

Nanotubular films on the surface of Ti-2Al-1.5Mn (TC1) alloy were fabricated by electrochemical anodization technique in aqueous ammonium fluoride solutions at 20V for 3h. The photoelectrochemical activities of the nanotube arrays were investigated, as well as their phase, structure, composition and photoabsorption properties. The photo-absorption in the visible region and the photoelectrochemical response were improved obviously. It is attributed to the Mn ion doping of TiO2 lattices. Furthermore, the resulted nanotube arrays are expected to have bright application prospects for solar utilization.

Synthesis and Photoelectrochemical Properties of Self-Organized Anodic TiO2 Nanotube Arrays

2011 ◽  
Vol 219-220 ◽  
pp. 1329-1332
Author(s):  
Shi Kai Liu ◽  
Wei Cui ◽  
Hai Bin Yang ◽  
Zheng Xin Li ◽  
Wen Jun Zou
Keyword(s):  
Surface Morphology ◽  
Aqueous Electrolyte ◽  
Tube Diameter ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
Amorphous Films ◽  
Self Organized ◽  
Different Temperatures ◽  
Crystalline Nature

Self-organized nanotube arrays were prepared by a facile two-electrode electrochemical anodization on pure Ti in a 0.5wt% NH4F aqueous electrolyte. The surface morphology, structure, optical and photoelectrochemical behaviors of the nanotubular films were considered. The as-formed nanotubes are highly ordered with ~700nm in length and the average tube diameter is about 90nm. By annealing the initially amorphous films at different temperatures, the importance of the crystalline nature is confirmed. The photoelectrochemical properties are investigated and the highest photocurrent of 2.297 mA/cm2 is obtained under AM1.5 100 mW/cm2 illumination at 0.6 V (vs Ag/AgCl).

scholarly journals Highly Ordered TiO2 Nanotube Arrays with Engineered Electrochemical Energy Storage Performances

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 510
Author(s):  
Wangzhu Cao ◽  
Kunfeng Chen ◽  
Dongfeng Xue
Keyword(s):  
Tio2 Nanotubes ◽  
Lithium Ion ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Free Standing ◽  
Structured Materials ◽  
Self Organized ◽  
Binder Free

Nanoscale engineering of regular structured materials is immensely demanded in various scientific areas. In this work, vertically oriented TiO2 nanotube arrays were grown by self-organizing electrochemical anodization. The effects of different fluoride ion concentrations (0.2 and 0.5 wt% NH4F) and different anodization times (2, 5, 10 and 20 h) on the morphology of nanotubes were systematically studied in an organic electrolyte (glycol). The growth mechanisms of amorphous and anatase TiO2 nanotubes were also studied. Under optimized conditions, we obtained TiO2 nanotubes with tube diameters of 70–160 nm and tube lengths of 6.5–45 μm. Serving as free-standing and binder-free electrodes, the kinetic, capacity, and stability performances of TiO2 nanotubes were tested as lithium-ion battery anodes. This work provides a facile strategy for constructing self-organized materials with optimized functionalities for applications.

Colloidal CuInS2 Based Nanocrystals /TiO2 Nanotube Arrays Composite Solar Cells Fabrication and Testing

2012 ◽  
Vol 1409 ◽  
Author(s):  
Vanga R. Reddy ◽  
William Wilson ◽  
Rick Eyi ◽  
Jiang Wu ◽  
M. O. Manasreh ◽  
...  
Keyword(s):  
Solar Cells ◽  
Low Cost ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Properties And Characterization ◽  
Self Organized ◽  
Current Voltage ◽  
Junction Type ◽  
Photovoltaic Technologies ◽  
First Time

ABSTRACTTo develop alternative and low cost photovoltaic technologies we have synthesized CuInS2 nanocrystals with tunable optical properties and characterization was carried out thoroughly with TEM, SEM, EDAX and XRD. Furthermore large self-organized arrays of TiO2 nanotubes were fabricated on Ti foil followed by simple electrochemical anodization technique and characterized their structure by SEM and then for the first time coupled both the nanocrystals and nanotubes to form a p-n junction type photovoltaic device. The current-voltage (I-V) characteristics of photovoltaic cells were measured to test the proof of concept. Some preliminary experiments showed that device generates some current upon illumination. However, in our case we fabricated a device without sandwiching any buffer or barrier layers in between nanocrystals and nanotube arrays. We have been optimizing our solar cells efficiency by improving quality of nanotubes and nanocrystals. Some of the interesting finding are presented and discussed.

scholarly journals Fabrication of TiO2 Nanotube by Electrochemical Anodization: Toward Photocatalytic Application

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
O. Zakir ◽  
R. Idouhli ◽  
M. Elyaagoubi ◽  
M. Khadiri ◽  
A. Aityoub ◽  
...  
Keyword(s):  
Tio2 Nanotubes ◽  
Pure Titanium ◽  
Size Control ◽  
Ammonium Fluoride ◽  
Electrode System ◽  
Electrochemical Anodization ◽  
Voltage Range ◽  
X Ray ◽  
Self Organized ◽  
Type Semiconductor

In this study, a self-organized nanotubular titanium dioxide (TiO2) array was successfully produced by anodizing pure titanium in a mixture of glycerol, distilled water (8% vol.), and ammonium fluoride using a dual electrode system. The size control and distribution of the nanopores were performed in a DC voltage range varying from 30 V to 60 V. The diameter of TiO2 nanopores varies from 59 to 128 nm depending on the anodizing voltage. Energy-dispersive X-ray spectroscopy (EDX) analysis reveals that the as-prepared films are essentially composed of TiO2. According to the X-ray diffraction (XRD) and Raman spectroscopy analysis, the nanotubular arrays of TiO2 annealed at 600°C for 2 hours are composed of a phase mixture of anatase and rutile. Mott-Schottky analysis showed that the TiO2 nanotubes are consistent with an n-type semiconductor with a donor density of about 1017 cm-3. Preliminary results on the photocatalytic degradation of a pharmaceutical pollutant showed that the TiO2 nanotubes can be used as a promising material for application in wastewater treatment.

scholarly journals Electrochemical Anodization and Characterization of Titanium Oxide Nanotubes for Photo Electrochemical Cells

2021 ◽  
Vol 2070 (1) ◽  
pp. 012073
Author(s):  
C U Bhadra ◽  
D Henry Raja ◽  
D Jonas Davidson
Keyword(s):  
Titanium Oxide ◽  
Oxygen Vacancies ◽  
Ammonium Fluoride ◽  
Band Gap Energy ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoluminescence Intensity ◽  
Titania Nanotube Arrays ◽  
Titanium Oxide Nanotubes ◽  
Inner Diameter

Abstract Due to its multitude of applications, titanium oxide is one of the most coveted and most sought-after materials. The above experiment demonstrated that TiO2 nanotube arrays might be formed by electrochemical anodization of titanium foil. The 0.25 wt% ammonium fluoride (NH4F) was added to a solution of 99% ethylene glycol. Anodization is carried out at a constant DC voltage of 12V for 1 hour. Then, the annealing process is carried out for 1 hour at 4800C, which is known as an annealing. FE-SEM were utilized to evaluate the surface morphology of the nanotube arrays that were made. At the wavelength of 405 nm, sharply peaked photoluminescence intensity was observed, which corresponded tothe band gap energy (3.2 eV) of the anatase TiO2 phase. Since free excitations appear at 391 and 496 nm, and since oxygen vacancies are developed on the surface of titania nanotube arrays, it is reasonable to conclude that free excitations and oxygen vacancies are the causes of humps at 391 and 496 nm, and that they may also be present at 412 and 450 nm. FESEM results showed uniformly aligned TiO2 nanotube arrays with an inner diameter of 100 nm and a wall thickness of 50 nm

scholarly journals Effect of Electrolyte Composition on Structural and Photoelectrochemical Properties of Titanium Dioxide Nanotube Arrays Synthesized by Anodization Technique

2020 ◽  
Vol 17 (4) ◽  
pp. 1183
Author(s):  
Tabarak Jafar Awaid ◽  
Asmaa Kadim Ayal ◽  
Ahlam Mohammed Farhan ◽  
Muna Sarhan Sando ◽  
Lim Ying Chin
Keyword(s):  
Ethylene Glycol ◽  
Diffuse Reflectance ◽  
Electrolyte Composition ◽  
Nanotube Arrays ◽  
Halogen Lamp ◽  
Photoelectrochemical Properties ◽  
X Ray ◽  
Photoelectrochemical Response ◽  
Titanium Dioxide Nanotube Arrays ◽  
Uv Visible

The present work involves studying the effect of electrolyte composition [@1= 0.5 wt.%  NH4F / 5% H2O / 5% Glycerol (GLY)/ 90%  Ethylene Glycol (EG)] and [ @2= 0.5 wt. % NH4F / 5% H2O / 95%  Ethylene Glycol (EG)]  on the structural and photoelectrochemical properties of titania nanotubes arrays (TNTAs). TNTAs substrates were successfully carried out via anodization technique and were carried out in 40 V for one hour in different electrolytes (@1, and @2). The properties of physicochemical of TNTAs were distinguished via an X-ray Diffractometer (XRD), Field Emission Scanning Electron Microscope (FESEM), an Energy Dispersive X-ray (EDX), and UV–visible diffuse reflectance. The photoelectrochemical response of TNTAs was evaluated in 0.01M Na2S under the choppy light of a halogen lamp. TNTAs photoelectrode prepared at @1 electrolyte was not sufficient to increase the photocurrent response compared to TNTAs prepared at @2. The TNTAs photoelectrode prepared in the @2 electrolyte confirmed the highest photoconversion efficiency compared to the TNTAs photoelectrode prepared in the @1 electrolyte.

Effect of Fluoride Concentration and Water Content on Morphology of Titania Nanotubes in Ethylene Glycol Solution

2013 ◽  
Vol 829 ◽  
pp. 907-911 ◽  
Author(s):  
Meysam Naghizadeh ◽  
Saber Ghannadi ◽  
Hossein Abdizadeh ◽  
Mohammad Reza Golobostanfard
Keyword(s):  
Ethylene Glycol ◽  
Water Content ◽  
Fluoride Concentration ◽  
Pure Titanium ◽  
Ammonium Fluoride ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Geometrical Parameters ◽  
High Concentration ◽  
Inner Diameter

Titanium dioxide (TiO2) nanotube arrays were prepared at room temperature by electrochemical anodization of a pure titanium foil in electrolyte solutions containing ethylene glycol as a solvent and de-ionized water and ammonium fluoride as additives. Since the morphology and size of TiO2 nanotubes play critical roles in determining their performance, the control of geometrical parameters of the nanotube arrays including length and inner diameter are of great importance. The present research demonstrates the significant effects of fluoride concentration and water content in anodizing electrolyte on formation of nanotubes and their dimensions. Scanning electron microscope investigation shows that nanotube arrays are no longer formed in very low or very high concentration of ammonium fluoride. Also, increase in fluoride concentration causes increase in lengths and inner diameters of the nanotubes. Moreover, it is evident that the maximum nanotube growth rate was achieved in medium amount of water. In addition, it is found that the nanotube inner diameter increases by adding more water to the solution.

Preparation and Photoelectrochemical Properties of TiO2 Nanotube Arrays Modified with Nano-Scaled CdSe

2013 ◽  
Vol 320 ◽  
pp. 138-142
Author(s):  
Jia Qin Liu ◽  
Yan Wang ◽  
Guang Qing Xu ◽  
Hong Mei Zheng ◽  
Rong Jun Pan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Deposition Process ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
Solution Deposition ◽  
Photo Response ◽  
Uniform Diameter ◽  
Scanning Electron ◽  
Sustained Increase

Highly ordered TiO2 nanotube arrays (TNTAs) with smooth walls and uniform diameter were prepared by electrochemical anodization. And then solution deposition process was adopted for the modification of the TNTAs with nanoscaled CdSe. The materials obtained were characterized by field emission scanning electron microscopy, UVvisible spectroscopic and photoelectrochemical techniques. The results revealed that the morphologies and growth mechanism for CdSe/TNTAs composites varied with the reaction time in Se2- solutions (c=1.2 mol/L) when nanotubes were firstly imported with Cd2+ ions. Optical absorption behavior of the CdSe/TNTAs composites increased with more CdSe nanoparticles. And the photo-response of the obtained nanomaterials was first strengthened and then declined with the sustained increase of the deposited CdSe.

Sign in / Sign up

Export Citation Format

Share Document