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Porous Alumina Films with Width-Controllable Alumina Stripes.

Huang K, Huang SM, Pu L, Shi Y, Wu ZM, Ji L, Kang JY - Nanoscale Res Lett (2010)

Bottom Line: The width of the alumina stripes increases proportionally with the anodizing voltage.And the pores tend to be initiated close to the alumina stripes.These phenomena can be ascribed to the electric field distribution in the alumina barrier layer caused by the geometric structure of the aluminum surface.

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ABSTRACT
Porous alumina films had been fabricated by anodizing from aluminum films after an electropolishing procedure. Alumina stripes without pores can be distinguished on the surface of the porous alumina films. The width of the alumina stripes increases proportionally with the anodizing voltage. And the pores tend to be initiated close to the alumina stripes. These phenomena can be ascribed to the electric field distribution in the alumina barrier layer caused by the geometric structure of the aluminum surface.

No MeSH data available.


AFM (top and lower left) and SEM (lower right) image of aluminum surface after being electropolished in perchloric acid–alcohol solution
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Figure 3: AFM (top and lower left) and SEM (lower right) image of aluminum surface after being electropolished in perchloric acid–alcohol solution

Mentions: The Fig. 2 indicates that the stripe width increases proportionally with the anodizing voltage. It can be assumed that this phenomenon would result from the non-uniformity of the electric field caused by the non-planar anodizing procedure of aluminum. Figure 3 shows the SEM and AFM image of aluminum surface after being electropolished in perchloric acid–alcohol solution. Cellular pattern can be observed on the aluminum surface. The average diameter of the cells is about 200 nm. The boundary of cells is formed by protuberant aluminum stripes. And it can be measured from the AFM image that the height of the stripes is about 20 nm. This cellular pattern on the aluminum surface is caused by the electropolishing procedure [23]. It can be seen easily that these features of the cells on the aluminum surface are quite similar to the cells on the alumina surface after further anodizing procedure. Thus, it can be deduced that the alumina stripes after anodizing procedure originate from the former aluminum stripes.


Porous Alumina Films with Width-Controllable Alumina Stripes.

Huang K, Huang SM, Pu L, Shi Y, Wu ZM, Ji L, Kang JY - Nanoscale Res Lett (2010)

AFM (top and lower left) and SEM (lower right) image of aluminum surface after being electropolished in perchloric acid–alcohol solution
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2991223&req=5

Figure 3: AFM (top and lower left) and SEM (lower right) image of aluminum surface after being electropolished in perchloric acid–alcohol solution
Mentions: The Fig. 2 indicates that the stripe width increases proportionally with the anodizing voltage. It can be assumed that this phenomenon would result from the non-uniformity of the electric field caused by the non-planar anodizing procedure of aluminum. Figure 3 shows the SEM and AFM image of aluminum surface after being electropolished in perchloric acid–alcohol solution. Cellular pattern can be observed on the aluminum surface. The average diameter of the cells is about 200 nm. The boundary of cells is formed by protuberant aluminum stripes. And it can be measured from the AFM image that the height of the stripes is about 20 nm. This cellular pattern on the aluminum surface is caused by the electropolishing procedure [23]. It can be seen easily that these features of the cells on the aluminum surface are quite similar to the cells on the alumina surface after further anodizing procedure. Thus, it can be deduced that the alumina stripes after anodizing procedure originate from the former aluminum stripes.

Bottom Line: The width of the alumina stripes increases proportionally with the anodizing voltage.And the pores tend to be initiated close to the alumina stripes.These phenomena can be ascribed to the electric field distribution in the alumina barrier layer caused by the geometric structure of the aluminum surface.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
Porous alumina films had been fabricated by anodizing from aluminum films after an electropolishing procedure. Alumina stripes without pores can be distinguished on the surface of the porous alumina films. The width of the alumina stripes increases proportionally with the anodizing voltage. And the pores tend to be initiated close to the alumina stripes. These phenomena can be ascribed to the electric field distribution in the alumina barrier layer caused by the geometric structure of the aluminum surface.

No MeSH data available.