Research On Optics And Electricity Application Properties Of Anodic Nanotubes

Porous anodic alumina(PAA) membranes have received considerable interests due to their controllable pore structure, stable preparation technology, and low cost of production. PAA has found numerous engineering applications and has been used in industry for nearly hundred years. In this dissertation, PAA with highly ordered arrays of nanopores was prepared on Al fabrics or foils by a two-step anodization process. Studies on structural and thermal properties of the prepared PAA membranes were carried out. Scanning electron microscopy and transmission electron microscopy were performed on the prepared PAA membranes at room temperature and 600 °C. Photoluminescence(PL) properties of PAA on Al foils under different annealing temperatures(100-600 °C) and PAA on Al fabrics before-after dyeing by Rhodamine B(RhB) have been investigated. For PAA on Al foils, with the increase of the annealing temperature, the PL intensity increases first, which reaches a maximum value at 500 °C, and then it decreases. For PAA on Al fabrics after dyeing by RhB, the white sample changed to pink and a new peak at 580 nm in the PL curve was found.Due to the larger specific surface area, the photocatalysis of TiO2 nanotube can perform better than traditional materials. Herein, TiO2 nanotube arrays on Ti fabric were obtained by a two-step anodization. The as-prepared amorphous TiO2 nanotube arrays were immersed in saturated zinc acetate solution, and the ZnO-TiO2 nanocomposite was fabricated after a thermal process in aqueous solution at 120 °C. The ZnO-TiO2 nanocomposite was further used as a photocatalyst, and almost 100% photodegradation of a 20 mg L-1 MO solution at pH=10 was achieved after 60 min UV irradiation. Furthermore, the degradation products were separated and identified to study the photocatalysis process. The results obtained in the study can be helpful in designing a scalable, practical process for dye wastewater treatment.Lithium-ion batteries(LIBs) are becoming a promising power source and due to a higher interfacial area, shorter path lengths, nano-sized material has been widely used in LIBs. Herein an efficient method is reported for coating Sn nanowires with an amorphous Al2O3 layer(Sn-Al2O3) based on a combination of mechanical pressure injection technique and partial dissolution of the anodic aluminum oxide template. Further, the Sn nanowires coated with Al2O3 are dispersed into carbon matrix(Sn-Al2O3-C) by ball milling. In this structure, Al2O3 helps to maintain structural integrity during charge–discharge process, and the introduced carbon matrix enhances electronic conductivity of the overall electrode. As a result, the Sn-Al2O3-C nanocomposite exhibits an enhanced cyclic and rate performance, namely, retaining the capacities of 1308.8 mAh g-1 at the current density of 30 mA g-1 after 20 cycles, 1063.3 mAh g-1 at the current density of 200 mA g-1, and 834.2 mAh g-1 at the current density of 500 mA g-1 after 100 cycles.