Synthesis Of Aluminum Zinc/Zinc Oxide Composite Nanotubes By Combining Template Method And Solid-state Reaction Method

One-dimensional nanomaterials have become the focus of current researches in nanomaterials, one-dimensional nanomaterials have attracted much attention because of their unique physical and chemical properties, excellent mechanical character since the Japanese scientist Lijima found the carbon nanotubes in1991. Nanotubes and nanowires with their large specific surface area, strong quantum size effect, and potential applications in many fields, such as chemical catalysis, optical electronic nano-devices, nano-mechanical, have become the important study content in one-dimensional nanomaterials. Research on their structures, synthesis, preparation, properties and applications etc, have made great progress.The band gap of aluminum zinc is3.8eV, which is a excellent semiconductor material, with the significant characteristics of large specific surface area and the small size, and potential applications in many fields, such as optical electronic device, metal anti-corrosion material, ceramic materials, refractories, catalyst and catalyst carriers. Study on aluminum zinc/zinc oxide composite nanotubes and aluminum zinc nanotubes is still in the laboratory stage, improving the preparation process has become the important task, after that, the practical application will be researched for further.This article used high purity aluminum as raw materials, through pretreatment, anodic oxidation process, removing the aluminum of the back, drilling, expanding the nano-holes, adopting a two-step anodic oxidation method prepared AAO templates, in which the nano-holes arranged uniform, with the inner diameter of about70nm, the outer diameter for110-120nm. Zinc nanowires were synthesized through electro-deposition route in AAO template; Zinc nanowires were annealed at300-420℃for40h, obtained ZnO nanowires with a small amount of Zn by this low-temperature annealing process; Then annealing at high temperature (600-800℃) for1h, At last, different morphology of "aluminum zinc/zinc oxide composite nanotube arrays" were obtained by NaOH etching treatment, removing the unreacted alumina. According to the kinetic analysis of the aluminum zinc/zinc oxide composite nanotube formation mechanism, Fitting the Boltzmann equation, obtained that the higher the temperature, the faster the reaction rate in the oxidation process of Zn nanowires. Through thermodynamic calculation at the first time, we obtained the values of the equilibrium constant Kp and standard Gibbs free energy values of the related reactions, such as the oxidation process of Zn nanowires, the formation process of aluminum zinc/zinc oxide composite nanotubes, and chemical etching process of the sample, solving the trend issues. Through analysis the preparation mechanism of aluminum zinc/zinc oxide composite nanotubes, we determine the main reason of forming tubes is because of the diffusion reaction between zinc oxide and aluminum oxide at the interfaces (solid-state reaction).