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TiO<sub>2</sub> 나노튜브 형상에 미치는 NH<sub>4</sub>F와 H<sub>2</sub>O의 영향
김건두 ( Geon-du Gim ),장상순 ( Sang-soon Jang ),김희산 ( Heesan Kim ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.3
The aim of this work is the attainment of the TiO<sub>2</sub>-nanotube photocatalytic-growth condition using anodization, whereby the NH<sub>4</sub>F-H<sub>2</sub>O weight ratio is appropriately controlled. We fabricated the TiO<sub>2</sub> nanotubes using a two-step anodization (first step is 1 hr; second step is 30 hr) under the ambient pressure and the room temperature at 60 V in ethylene-glycol solutions to investigate the effects of the NH<sub>4</sub>F(0.1,0.3,0.5wt%) and H<sub>2</sub>O(1-3wt%) on the Ti<sub>O</sub>2-nanotube geometry and the photocatalytic efficiency. Further, the decomposition efficiency of the methylene blue on the Ti<sub>O</sub>2 nanotubes by the UN radiation depended on the geometrical change of the nanotube geometry, indicating the proportionality of the decomposition efficiency to the surface area that was affected by the NH4F and H<sub>2</sub>O concentrations. As the NH4F weight was increased, the surface area initially decreased but slightly increased later, and the length consistently increased. As the H<sub>2</sub>O weight was increased, the surface area and length initially increased, but later decreased with the 3 wt% H<sub>2</sub>O.
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