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Large surface area titanium oxide nanotube arrays anodized in KH2PO4/NH4F/citric acid electrolytes by multi step voltage method
We present titanium oxide nanotube arrays for solar cell, gas sensor, ultra filter, and biomaterials. To make titanium oxide nanotubes, potassium phosphate monobasic (KH2PO4) 1M aqueous electrolytes containing fluorine 0.15M and citric acid 0.2M were firstly prepared and 99.7% pure titanium was anodized. Titanium oxide nanotube arrays were fabricated at anodization potential range from 20 V to 28 V and 4.64 pH. Citric acid was very useful to control the pH of the 1M KH2PO4 water electrolyte solution within 3 to 5 [1]. Nanotube length of 2 μm was independent on anodization time at 20 V for anodization time from 5 to 23 hrs which was observed by FESEM. Pore diameter and length of titanium oxide nanotube were increased with anodization voltage of 20 to 28 V. The pore diameter and length of titanium oxide nanotube, as shown in Fig. 1 and 3, were 100 to 150 nm and 2.0 to 3.0 μm, respectively. At higher anodization voltages than 25 V, porous layer was made and titanium oxide nanotube could not be made.
Large surface area titanium oxide nanotube arrays anodized in KH2PO4/NH4F/citric acid electrolytes by multi step voltage method
We present titanium oxide nanotube arrays for solar cell, gas sensor, ultra filter, and biomaterials. To make titanium oxide nanotubes, potassium phosphate monobasic (KH2PO4) 1M aqueous electrolytes containing fluorine 0.15M and citric acid 0.2M were firstly prepared and 99.7% pure titanium was anodized. Titanium oxide nanotube arrays were fabricated at anodization potential range from 20 V to 28 V and 4.64 pH. Citric acid was very useful to control the pH of the 1M KH2PO4 water electrolyte solution within 3 to 5 [1]. Nanotube length of 2 μm was independent on anodization time at 20 V for anodization time from 5 to 23 hrs which was observed by FESEM. Pore diameter and length of titanium oxide nanotube were increased with anodization voltage of 20 to 28 V. The pore diameter and length of titanium oxide nanotube, as shown in Fig. 1 and 3, were 100 to 150 nm and 2.0 to 3.0 μm, respectively. At higher anodization voltages than 25 V, porous layer was made and titanium oxide nanotube could not be made.
Large surface area titanium oxide nanotube arrays anodized in KH2PO4/NH4F/citric acid electrolytes by multi step voltage method
Seong-Je Cho, (author) / Dae-Jin Yang, (author) / Jong-Oh Kim, (author) / Won-Youl Choi, (author)
2006-10-01
439103 byte
Conference paper
Electronic Resource
English
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