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Fabrication of complete titania nanoporous structures via electrochemical anodization of Ti.

Ali G, Chen C, Yoo SH, Kum JM, Cho SO - Nanoscale Res Lett (2011)

Bottom Line: However, a complete titania nano-porous (TNP) structures are obtained when the second anodization is conducted in a viscous electrolyte when compared to the first one.The average pore diameter is approximately 70 nm, while the average inter-pore distance is approximately 130 nm.These TNP structures are useful to fabricate other nanostructure materials and nanodevices.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon 305-701, Republic of Korea. socho@kaist.ac.kr.

ABSTRACT
We present a novel method to fabricate complete and highly oriented anodic titanium oxide (ATO) nano-porous structures with uniform and parallel nanochannels. ATO nano-porous structures are fabricated by anodizing a Ti-foil in two different organic viscous electrolytes at room temperature using a two-step anodizing method. TiO2 nanotubes covered with a few nanometer thin nano-porous layer is produced when the first and the second anodization are carried out in the same electrolyte. However, a complete titania nano-porous (TNP) structures are obtained when the second anodization is conducted in a viscous electrolyte when compared to the first one. TNP structure was attributed to the suppression of F-rich layer dissolution between the cell boundaries in the viscous electrolyte. The structural morphologies were examined by field emission scanning electron microscope. The average pore diameter is approximately 70 nm, while the average inter-pore distance is approximately 130 nm. These TNP structures are useful to fabricate other nanostructure materials and nanodevices.

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FESEM images of TiO2 nanotubes fabricated in EG containing 0.5 wt% NH4F and 0.2 wt% H2O via first-step anodization: (a) top surface view, (b) bottom surface view, (c) cross-sectional view, and (d) top view of Ti-substrate after separation of TiO2 nanotubes.
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Figure 2: FESEM images of TiO2 nanotubes fabricated in EG containing 0.5 wt% NH4F and 0.2 wt% H2O via first-step anodization: (a) top surface view, (b) bottom surface view, (c) cross-sectional view, and (d) top view of Ti-substrate after separation of TiO2 nanotubes.

Mentions: Figure 2 shows FESEM images of TNT fabricated in EG-based electrolyte at 50 V for 7 h after first-step anodization. TNT with open mouth-tube morphology was obtained after optimized ultrasonic agitation (Figure 2a). Figure 2b shows the bottom surface morphology of TNT after peeling-off from underlying Ti-substrate. It is clear from the image that TNTs are closed at bottom surface. Figure 2c shows the cross-sectional image of TNT. The image clearly reveals that TNT are very smooth (ripples free) and well-ordered with closed packed morphology, which is consistent well with the bottom surface of TNT (Figure 2b). Ti-substrate after removal of TiO2 nanotubes, formed in the first-step anodization, is shown in Figure 2d. A well-ordered honeycomb-like concave patterned morphology can be seen in most of the area; however, slight deviation from ordered morphology is also present in some small area. The pores are arranged in perfect hexagonal ordered in a very large domain area. The concave shape morphology is perfectly matched with the convex shape morphology of bottom surface of TNT (Figure 2b).


Fabrication of complete titania nanoporous structures via electrochemical anodization of Ti.

Ali G, Chen C, Yoo SH, Kum JM, Cho SO - Nanoscale Res Lett (2011)

FESEM images of TiO2 nanotubes fabricated in EG containing 0.5 wt% NH4F and 0.2 wt% H2O via first-step anodization: (a) top surface view, (b) bottom surface view, (c) cross-sectional view, and (d) top view of Ti-substrate after separation of TiO2 nanotubes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211420&req=5

Figure 2: FESEM images of TiO2 nanotubes fabricated in EG containing 0.5 wt% NH4F and 0.2 wt% H2O via first-step anodization: (a) top surface view, (b) bottom surface view, (c) cross-sectional view, and (d) top view of Ti-substrate after separation of TiO2 nanotubes.
Mentions: Figure 2 shows FESEM images of TNT fabricated in EG-based electrolyte at 50 V for 7 h after first-step anodization. TNT with open mouth-tube morphology was obtained after optimized ultrasonic agitation (Figure 2a). Figure 2b shows the bottom surface morphology of TNT after peeling-off from underlying Ti-substrate. It is clear from the image that TNTs are closed at bottom surface. Figure 2c shows the cross-sectional image of TNT. The image clearly reveals that TNT are very smooth (ripples free) and well-ordered with closed packed morphology, which is consistent well with the bottom surface of TNT (Figure 2b). Ti-substrate after removal of TiO2 nanotubes, formed in the first-step anodization, is shown in Figure 2d. A well-ordered honeycomb-like concave patterned morphology can be seen in most of the area; however, slight deviation from ordered morphology is also present in some small area. The pores are arranged in perfect hexagonal ordered in a very large domain area. The concave shape morphology is perfectly matched with the convex shape morphology of bottom surface of TNT (Figure 2b).

Bottom Line: However, a complete titania nano-porous (TNP) structures are obtained when the second anodization is conducted in a viscous electrolyte when compared to the first one.The average pore diameter is approximately 70 nm, while the average inter-pore distance is approximately 130 nm.These TNP structures are useful to fabricate other nanostructure materials and nanodevices.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon 305-701, Republic of Korea. socho@kaist.ac.kr.

ABSTRACT
We present a novel method to fabricate complete and highly oriented anodic titanium oxide (ATO) nano-porous structures with uniform and parallel nanochannels. ATO nano-porous structures are fabricated by anodizing a Ti-foil in two different organic viscous electrolytes at room temperature using a two-step anodizing method. TiO2 nanotubes covered with a few nanometer thin nano-porous layer is produced when the first and the second anodization are carried out in the same electrolyte. However, a complete titania nano-porous (TNP) structures are obtained when the second anodization is conducted in a viscous electrolyte when compared to the first one. TNP structure was attributed to the suppression of F-rich layer dissolution between the cell boundaries in the viscous electrolyte. The structural morphologies were examined by field emission scanning electron microscope. The average pore diameter is approximately 70 nm, while the average inter-pore distance is approximately 130 nm. These TNP structures are useful to fabricate other nanostructure materials and nanodevices.

No MeSH data available.


Related in: MedlinePlus