多孔阳极氧化铝模板的制备及形成机理研究

【作者】 李东栋；

【导师】 朱绪飞；

【作者基本信息】 南京理工大学 ， 材料学， 2005， 硕士

【摘要】 本文利用阳极氧化的电压-时间曲线、扫描电子显微镜、能量色散X射线谱、X射线粉末衍射仪、电容器模型等仪器对氧化过程及氧化膜进行表征。分别采用一次阳极氧化和二次阳极氧化制备了多孔氧化铝模板。结果表明,随着氧化时间的增长,多孔氧化膜的有序度增加。经过二次氧化后得到的氧化膜虽然氧化的时间较短,但有序度比一次氧化的多孔氧化膜要高,可以形成排列规则的六角蜂窝形孔洞。 通过自制的电解电容器模型,利用氧化铝薄膜的介电性能计算氧化膜的厚度。结果表明:利用其介电性能可以准确的计算阻挡层氧化膜厚度,阻挡层生成率为1.219。 讨论了电解液的种类以及氧化时间、环境温度、电流密度、电解液浓度等条件研究了这些因素对氧化过程的影响。并提出了多孔氧化铝膜的形成与发展模型,认为O₂的产生对多孔氧化膜的产生和发展有着促进的作用。对于溶解能力较强的酸性溶液,O₂的产生有着扩孔的作用;对于溶解能力较弱的近中性溶液,O₂的存在对孔的产生起着至关重要的作用。 利用氧化铝模板制备导电聚吡咯,聚吡咯在三氧化二铝模板的孔洞中只能以高度有序的共轭结构一维生长,当其长出模板时,由于高分子长链的交联作用,聚吡咯已形成的高度有序一维结构有利于其继续按照一维结构生长。更多还原

【Abstract】 The anodizing process and anodic aluminum oxide （AAO） films were characterized by means of Voltage-time curves, SEM, EDAX, XRD and electrolyte capacitor model. Porous alumina templates were obtained by one and two-step anodization respectively. The results indicate that the order degree raises with prolonged time. The regularity of holes arrangement in the membrane made by two-step anodic oxidation displayed better than that of the membrane anodizing only once from experimental results.It was swiftly to obtain the thickness of alumina film by use of its dielectric property and electrolyte capacitor model. The results show that, the thickness of barrier oxide films can be calculated accurately by use of its dielectric property. The barrier layer produce rate is 1.219.Various factors （e.g. electrolytes, anodizing time, temperature, current density, electrolyte concentration, etc.） influenced the anodization process were investigated. The results show that the nanometer pores have formed before reaching the peak point in acid electrolyte. Nanometer pores also can be obtained in nearly neutral electrolyte. Different factors affect the regularity of porous distribution together in anodizing process. The model of AAO films was founded which admits that O₂ has the positive effect on the forming and developing of AAO films.Electric PPy nanowairs was synthesized by alumina templates.Polypyrrole nanowires growing with one-dimension in nanometer pores. PPy keeps on developing with high regularity in one-dimension out of membrane owing to the cross-link effect.更多还原