Nano-structure and method of making the same
First Claim
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1. A method for making a nano-structure, comprising:
- partially anodizing an aluminum layer in an electrolyte and at a voltage to form a porous anodic alumina structure including a plurality of pores, wherein each of the plurality of pores has a bottom portion that is defined by an alumina barrier layer of the porous anodic alumina structure, the aluminum layer being positioned on an oxidizable material layer;
partially anisotropic etching the porous anodic alumina structure to form tracks in the alumina barrier layer at the bottom portion of each of the plurality of pores within the porous anodic alumina structure;
further anodizing a remaining portion of the aluminum layer in the electrolyte and at the voltage until a current density decreases and reaches a steady state, thereby completing anodization of the aluminum layer and forming open paths where the tracks had been formed; and
anodizing the oxidizable material layer to form an oxide, whereby the oxide grows through the open paths formed within the porous anodic alumina structure to form a set of super nano-pillars.
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Abstract
In an example of a method for making a nano-structure, an aluminum layer is partially anodized to form a porous anodic alumina structure. The aluminum layer is positioned on an oxidizable material layer. The porous anodic alumina structure is exposed to partial anisotropic etching to form tracks within the porous anodic alumina structure. A remaining portion of the aluminum layer is further anodized to form paths where the tracks are formed. The oxidizable material layer is anodized to from an oxide, where the oxide grows through the paths formed within the porous anodic alumina structure to form a set of super nano-pillars.
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11 Claims
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1. A method for making a nano-structure, comprising:
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partially anodizing an aluminum layer in an electrolyte and at a voltage to form a porous anodic alumina structure including a plurality of pores, wherein each of the plurality of pores has a bottom portion that is defined by an alumina barrier layer of the porous anodic alumina structure, the aluminum layer being positioned on an oxidizable material layer; partially anisotropic etching the porous anodic alumina structure to form tracks in the alumina barrier layer at the bottom portion of each of the plurality of pores within the porous anodic alumina structure; further anodizing a remaining portion of the aluminum layer in the electrolyte and at the voltage until a current density decreases and reaches a steady state, thereby completing anodization of the aluminum layer and forming open paths where the tracks had been formed; and anodizing the oxidizable material layer to form an oxide, whereby the oxide grows through the open paths formed within the porous anodic alumina structure to form a set of super nano-pillars. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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