TiO2 나노튜브 형상에 미치는 NH4F와 H2O의 영향
Effects of NH4F and H2O on the Geometry of TiO2 Nanotubes
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The aim of this work is the attainment of the TiO2-nanotube photocatalytic-growth condition usinganodization, whereby the NH4F–H2O weight ratio is appropriately controlled. We fabricated the TiO2nanotubes using a two-step anodization (first step is 1 hr; second step is 30 hr) under the ambientpressure and the room temperature at 60 V in ethylene-glycol solutions to investigate the effects ofthe NH4F(0.1,0.3,0.5wt%) and H2O(1–3wt%) on the TiO2-nanotube geometry and the photocatalyticefficiency. Further, the decomposition efficiency of the methylene blue on the TiO2 nanotubes by theUN radiation depended on the geometrical change of the nanotube geometry, indicating the proportionalityof the decomposition efficiency to the surface area that was affected by the NH4F and H2O concentrations. As the NH4F weight was increased, the surface area initially decreased but slightly increased later,and the length consistently increased. As the H2O weight was increased, the surface area and lengthinitially increased, but later decreased with the 3 wt% H2O.
Abstract
The aim of this work is the attainment of the TiO2-nanotube photocatalytic-growth condition usinganodization, whereby the NH4F–H2O weight ratio is appropriately controlled. We fabricated the TiO2nanotubes using a two-step anodization (first step is 1 hr; second step is 30 hr) under the ambientpressure and the room temperature at 60 V in ethylene-glycol solutions to investigate the effects ofthe NH4F(0.1,0.3,0.5wt%) and H2O(1–3wt%) on the TiO2-nanotube geometry and the photocatalyticefficiency. Further, the decomposition efficiency of the methylene blue on the TiO2 nanotubes by theUN radiation depended on the geometrical change of the nanotube geometry, indicating the proportionalityof the decomposition efficiency to the surface area that was affected by the NH4F and H2O concentrations. As the NH4F weight was increased, the surface area initially decreased but slightly increased later,and the length consistently increased. As the H2O weight was increased, the surface area and lengthinitially increased, but later decreased with the 3 wt% H2O.
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