孔间距和孔径连续可调的PAA模板的制备

Fabrication of PAA templates with continuously adjustable inter-pore distance and pore diameter

在磷酸溶液中以二次阳极氧化制备的多孔阳极氧化铝(PAA)模板存在孔的规整低的缺点,文中提出了在磷酸/草酸混合溶液中采用二次阳极氧化法制备高规整(PAA)模板,利用图像处理软件(Image-Pro plus)对PAA膜的扫描电镜图进行分析处理,定量研究了阳极氧化电压、草酸含量和扩孔时间对PAA模板的孔径和孔间距的影响。由实验结果可知,在质量分数1%磷酸溶液中加入0.03 mol/L草酸溶液作为阳极氧化电解液,阳极氧化电压可以达到200 V。通过调节草酸添加量和阳极氧化电压可以得到孔间距在345—498 nm范围内高规整PAA模板。通过改变扩孔时间可以获得孔径在140-400 nm范围内高规整PAA模板,并且孔径与扩孔时间呈正线性相关关系,相关系数为0.99。这种高规整孔径、孔间距连续可调的PAA模板能够被用于制备规整金属纳米线阵列、纳米管阵列和高分子纳米柱等材料。

Aiming at the poor regularity of porous anodic alumina （PAA） templates fabricated in phosphoric acid electrolyte by two-step anodization, a novel method was presented for fabricating high regularity PAA template in phosphoric/oxalic acid mixed solution by two-step anodization, the image process software （image-Pro plus） was utilized for analyzing the FESEM images of PAA templates, the quantitative correlations between anodizing oxidation potential, content of oxalic acid, pore-widening time and pore diameter, inter-pore distance were explored. The results show that the anodizing oxidation potential can be improved to 200 V, when 0.03 M oxalic acid is added into anodizing oxidation electrolyte with mass fraction 1% phosphoric acid. Highly regularity PAA templates with from 345 to 498 nm inter-pore distance can be obtained by adjusting the content of oxalic acid and anodizing oxidation potential, however, the highly regularity PAA templates with from 140 to 400 nm pore diameter can be obtained by changing the pore-widening time, and the pore diameter is positively correlative with the pore widening time, the correlation efficient is 0.99. The PAA templates with high regularity, continuous adjustable pore diameter and inter-pore distance can be utilized for fabricating the metal nanowire or nanotube of specific dimensions and polymer nano-materials etc.