Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of NH4F and H2O on the Geometry of TiO2 Nanotubes

TiO2 나노튜브 형상에 미치는 NH4F와 H2O의 영향

  • Gim, Geon-Du (Department of Materials Science and Engineering, Hongik University) ;
  • Jang, Sang-Soon (Department of Materials Science and Engineering, Hongik University) ;
  • Kim, Heesan (Department of Materials Science and Engineering, Hongik University)
  • 김건두 (홍익대학교 금속공학과) ;
  • 장상순 (홍익대학교 금속공학과) ;
  • 김희산 (홍익대학교 금속공학과)
  • Received : 2018.04.17
  • Accepted : 2018.05.30
  • Published : 2018.06.29
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Abstract

The aim of this work is the attainment of the $TiO_2-nanotube$ photocatalytic-growth condition using anodization, whereby the $NH_4F-H_2O$ weight ratio is appropriately controlled. We fabricated the $TiO_2$ 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 $NH_4F$(0.1,0.3,0.5wt%) and $H_2O$(1-3wt%) on the $TiO_2-nanotube$ geometry and the photocatalytic efficiency. Further, the decomposition efficiency of the methylene blue on the $TiO_2$ 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 $NH_4F$ and $H_2O$ concentrations. As the $NH_4F$ weight was increased, the surface area initially decreased but slightly increased later, and the length consistently increased. As the $H_2O$ weight was increased, the surface area and length initially increased, but later decreased with the 3 wt% $H_2O$.

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References

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