Các ống nano TiO2 có vách theo chiều dọc được điều chế bằng phương pháp khắc điện hóa

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Tác giả:

Ngôn ngữ: vie

Ký hiệu phân loại: 541.37 Electrochemistry and magnetochemistry

Thông tin xuất bản: Nanoscience and Nanotechnology, 2014

Mô tả vật lý: 45297

Bộ sưu tập: Metadata

ID: 506419

 This paper reports on the fabrication of non-chapped, vertically well aligned titanium dioxide nanotubes (TONTs) by using electrochemical etching method and further heat treatment. Very highly ordered metallic titanium nanotubes (TNTs) were formed by directly anodizing titanium foil at room temperature in an electrolyte composed of ammonium fluoride (NH4F), ethylene glycol (EG), and water. The morphology of as-formed TNTs is greatly dependent on the applied voltage, NH4F content and etching time. Particularly, the authors have found two interesting points related to the formation of TNTs: (i) the smooth surface without chaps of the largely etched area was dependent on the crystalline orientation of the titanium foil
  and (ii) by increasing the anodizing potential from 15 V to 20 V, the internal diameter of TNT was increased from about 50 nm to 60 nm and the tube density decreased from 403 tubes pm-2 down to 339 tubes pm-2, respectively. For the anodizing duration from 1 h to 5 h, the internal diameter of each TNT was increased from ~30 nm to 60 nm and the tube density decreased from 496 tubes pm-2 down to 403 tubes pm-2. After annealing at 400°C in open air for 1 h, the TNTs were transformed into TONTs in anatase structure
  further annealing at 600°C showed the structural transformation from anatase to rutile as determined by Raman scattering spectroscopy.
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