The invention discloses an
anodic aluminum oxide template with three-dimensional gradual-changed hole array
nanostructure and a preparation method of the
anodic aluminum oxide template. The preparation method comprises the following steps: carrying out high-strength
oxidation process on an aluminum sheet in the acidic
electrolyte to form a porous aluminum
oxide layer, then removing the porous aluminum
oxide layer and forming nanometer concave pattern on the surface of the aluminum sheet; oxidizing the aluminum sheet in the acidic
electrolyte again to perform hole expanding process in the acidic
electrolyte; and repeating the processes, adjusting at least one condition in the
electrolyte composition, the oxidation
voltage, the oxidation time and the hole expanding time, and circulation times to obtain the target product. By using the preparation method in the invention, the industrialized and quick production of the three-dimensional gradual-changed hole array
nanostructure with low cost is realized, and the size of the basic construction unit of the product prepared is diminished continuously or discontinuously from top to bottom. The central axis of the product is vertical to the
base plane, the hole
pitch can be adjusted in the range of 50 nm to 1200 nm, and the profile of hole channel can be regulated accurately. The invention has a wide application prospect in the development of various functional
nanomaterials.