铝阳极氧化法制备Al_2O_3纳米线

Preparation of alumina nanowires by aluminum anodization

采用二次铝阳极氧化法在草酸体系中制备多孔铝阳极氧化膜,用逆电剥离技术将氧化膜从铝基体上剥离。经超声清洗后,放入磷酸溶液中去除阻挡层,使纳米孔贯通。再将膜放入c=1mol/L的NaOH溶液和w=6%的铬酸、w=1 8%的磷酸混合溶液中进行溶解,可获得Al2O3纳米线。纳米线长度为40μm,与模板厚度一致,直径为10～20nm。通孔前后铝阳极氧化膜的形貌由SEM进行表征,纳米线的形貌由SEM和TEM表征。此外,本文还结合模板在溶解过程中的实验现象,对Al2O3纳米线的形成机理进行了初步分析。

One kind of multi-hole aluminum anodization films was prepared by two-step aluminum anodization in the solution of oxalic acid, and then stripped from the aluminum substrate by reverse-current stripping technique. The barrier layers were chemically dissolved in phosphoric acid solution from the anodization films cleaned by ultrasonic, which made the nano-holes perforate. Alumina nanowires were finally obtained by etching aluminum anodization films in sodium hydroxide solution with c=1 mol/L and a mixed solution of H_2CrO_4 solution of w=6% and H_3PO_4 solution of w=1.8%. The aluminum nanowire has 40 μm of length which is in accordance with the template thickness and 10～20 nm of diameter. The microstructure of aluminum anodization films before and after perforating holes was studied by scanning electron microscopy (SEM), and the morphology of the alumina nanowire was characterized by transmission electron microscopy (TEM) and SEM. The formation mechanism of the nanowires was discussed combined with the experimental phenomena observed in template dissolving.