Concave cylinder regular triangular prism shaped aluminum oxide nanowire and in-situ preparation thereof

Abstract

The invention relates to concave-cylindrical regular-triangular-prism-shaped alumina-nano-wires. Geometric configuration of the nano-wires is: a concave-cylindrical regular triangular prism. Profiles of a standard regular triangular prism are three strictly identical planes; cross-section of the standard regular triangular prism is a regular triangle; profiles of the concave-cylindrical regular triangular prism are three strictly identical inner concave-cylindrical planes which are one third of the circumscribed cylindrical surface of the concave-cylindrical regular triangular prism. The preparation method includes the following steps: 1) a solution of electrolyte is prepared; 2) an aluminum substrate is prepared: an aluminum sheet with purity of 99.999 percent after being polished by electrochemistry, is taken out and cleaned with deionized water and then dried with nitrogen; and 3) a modified anode oxidation method is adopted to grow concave-cylindrical regular-triangular-prism-shaped alumina-nano-wires: the anode oxidation is carried out to the aluminum substrate under the condition of direct current and constant voltage, and the concave-cylindrical regular-triangular-prism-shaped alumina-nano-wires grow on the surface of the aluminum substrate. Voltage adopted by the anode oxidation is 70 V to 90 V.

Description

technical field [0001] The invention relates to a nanometer material and a preparation method thereof, in particular to a regular triangular prism aluminum oxide nanowire with a concave cylindrical surface and a preparation method thereof in situ, with controllable characteristic parameters and high yield. Background technique [0002] One-dimensional nanomaterials are an important part of nanomaterials, and have good prospects in basic scientific research and application fields. Alumina nanowires (Alumina Nanowires) are an important class of one-dimensional nanomaterials, which have many excellent properties, such as: high melting point, high chemical stability, large specific surface area, strong chemical adsorption capacity and so on. At present, the most important method for preparing alumina nanowires is based on anodization of high-purity aluminum films. The first inventor successfully prepared nanowires with a length of 400-800nm ​​and an outer diameter of 20-40nm in ...

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Problems solved by technology

Shortly after the reports in Documents 1 and 2, Document 7 proposed a partially improved chemical method—the basic principle of which is to appropriately increase the chemical etching time of the porous alumina film, in order to improve the efficiency of the preparation of alumina nanotubes by the methods described in Documents 1 and 2. Yield, but this method is not satisfactory in improving the yield of alumina nanotubes. At the same time, due to the excessive corrosion that is difficult to control accurately, the obtained alumina nanotube structure is severely damaged by corrosion, and until the aluminum oxide nanotubes caused by excessive corrosion The aluminum oxide nanowires with irregular structure and shape are formed by the rupture of the nanotube wall [Reference 7]. The main contribution of Document 7 is that the yield of alumina nanowires is increased by artificial over-corrosion

After the reports in Documents 1, 2 and 7, many research groups followed up and proposed various "improved" chemical methods in order to increase the yield of alumina nanotubes, especially nanowires (relatively easy), but these subsequent The scientific original contributions of the research on the expected yield, the actual experimental effect and the principle of material quality are all less than literatures 1, 2 and 7

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