양극산화 제어에 의한 TiO2 나노튜브의 광전기화학 특성
Photoelectrochemical Properties of TiO2 Nanotubes by Well-Controlled Anodization Process
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We investigated a correlation between morphology and photoelectrochemical properties of TiO2 nanotubes fabricated by well-controlled anodization processes. Anodization in an ethylene-glycol-based electrolyte solution accelerated the rapid grow rate of TiO2 nanotubes, but also cause problems such as delamination at the interface between TiO2 nanotubes and a Ti substrate, and debris on the top of the nanotube. The applied voltages for the anodization of TiO2 were adjusted to avoid the interface delamination. The heat treatment and the anodizing time were also controlled to enhance the crystallinity of the as-prepared TiO2 nanotubes and to increase the surface area with the varied length of the anodized TiO2 nanotubes. Additionally, a 2-step anodization process was utilized to remove the debris on the tube top. The photoelectrochemical properties of TiO2 nanotubes prepared with the carefully tailored conditions were investigated. By removing the debris on TiO2 nanotubes, applied bias photon-to-current efficiency (ABPE) of TiO2 nanotubes increased up to 0.33%.
Abstract
We investigated a correlation between morphology and photoelectrochemical properties of TiO2 nanotubes fabricated by well-controlled anodization processes. Anodization in an ethylene-glycol-based electrolyte solution accelerated the rapid grow rate of TiO2 nanotubes, but also cause problems such as delamination at the interface between TiO2 nanotubes and a Ti substrate, and debris on the top of the nanotube. The applied voltages for the anodization of TiO2 were adjusted to avoid the interface delamination. The heat treatment and the anodizing time were also controlled to enhance the crystallinity of the as-prepared TiO2 nanotubes and to increase the surface area with the varied length of the anodized TiO2 nanotubes. Additionally, a 2-step anodization process was utilized to remove the debris on the tube top. The photoelectrochemical properties of TiO2 nanotubes prepared with the carefully tailored conditions were investigated. By removing the debris on TiO2 nanotubes, applied bias photon-to-current efficiency (ABPE) of TiO2 nanotubes increased up to 0.33%.
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