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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.

No MeSH data available.


Related in: MedlinePlus

Schematic of fabrication process of obtaining TiO2 nanotubes with nanoporous layer on top and complete titania nanoporous (TNP) structure via two-step anodization: (a) Ti-foil, (b) first anodization and formation of TNTs with oxide layer on top, (c) TNTs with clear top end, (d) Ti-substrate after separation of TNTs, (e) TNTs covered with thin nanoporous layer, (f) complete TNP structure with uniform and parallel nanochannels.
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Figure 1: Schematic of fabrication process of obtaining TiO2 nanotubes with nanoporous layer on top and complete titania nanoporous (TNP) structure via two-step anodization: (a) Ti-foil, (b) first anodization and formation of TNTs with oxide layer on top, (c) TNTs with clear top end, (d) Ti-substrate after separation of TNTs, (e) TNTs covered with thin nanoporous layer, (f) complete TNP structure with uniform and parallel nanochannels.

Mentions: The formation mechanism of TiO2 nanotubular and TNP structure is shown in Figure 1. A well-known two-step anodization method was applied to obtain highly ordered TNT and TNP structure. TNT is fabricated in EG-based electrolyte through the first-step anodization using Ti-foil (Figure 1a). The top surface of the TNT is always covered with some kind of oxide layer (Figure 1b) irrespective of the anodizing time. The oxide layer can be removed with ultrasonic agitation and TNT with clear top end can be achieved (Figure 1c). TNT can be easily peeled-off from under lying Ti-sheet by applying N2 stream. Honeycomb-like patterned Ti-substrate is available for further anodization after the separation of TNT from underlying Ti-foil (Figure 1d). The second-step anodization in EG-based and HF-containing aqueous electrolytes produced TNT covered with a thin nano-porous layer on the top surface (Figure 1e), while the second-step anodization in glycerol-based electrolyte led to highly uniform and ordered TNP morphology (Figure 1f).


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)

Schematic of fabrication process of obtaining TiO2 nanotubes with nanoporous layer on top and complete titania nanoporous (TNP) structure via two-step anodization: (a) Ti-foil, (b) first anodization and formation of TNTs with oxide layer on top, (c) TNTs with clear top end, (d) Ti-substrate after separation of TNTs, (e) TNTs covered with thin nanoporous layer, (f) complete TNP structure with uniform and parallel nanochannels.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Schematic of fabrication process of obtaining TiO2 nanotubes with nanoporous layer on top and complete titania nanoporous (TNP) structure via two-step anodization: (a) Ti-foil, (b) first anodization and formation of TNTs with oxide layer on top, (c) TNTs with clear top end, (d) Ti-substrate after separation of TNTs, (e) TNTs covered with thin nanoporous layer, (f) complete TNP structure with uniform and parallel nanochannels.
Mentions: The formation mechanism of TiO2 nanotubular and TNP structure is shown in Figure 1. A well-known two-step anodization method was applied to obtain highly ordered TNT and TNP structure. TNT is fabricated in EG-based electrolyte through the first-step anodization using Ti-foil (Figure 1a). The top surface of the TNT is always covered with some kind of oxide layer (Figure 1b) irrespective of the anodizing time. The oxide layer can be removed with ultrasonic agitation and TNT with clear top end can be achieved (Figure 1c). TNT can be easily peeled-off from under lying Ti-sheet by applying N2 stream. Honeycomb-like patterned Ti-substrate is available for further anodization after the separation of TNT from underlying Ti-foil (Figure 1d). The second-step anodization in EG-based and HF-containing aqueous electrolytes produced TNT covered with a thin nano-porous layer on the top surface (Figure 1e), while the second-step anodization in glycerol-based electrolyte led to highly uniform and ordered TNP morphology (Figure 1f).

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