为了制备规则有序、大孔间距的多孔阳极氧化铝(PAA)模板,通过在传统的草酸溶液中添加乙醇以及阶梯升压的方法,使草酸溶液的耐压从原来的40 V左右提高至150 V,制备了大孔径(约200 nm)、大孔间距(约350 nm)的有序 PAA模板。详细研究了这种高电压氧化得到的具有较厚阻挡层 PAA 模板的通孔工艺,实验结果表明,在5%(质量分数)磷酸水溶液中30℃下浸泡180 min,可以得到有序的 PAA 通孔模板,首次计算了阻挡层的减薄速率为约1.26 nm/min。
In order to fabricate well-ordered and through-hole porous anodic alumina (PAA)template with large interpore distance,ethanol and oxalic acid aqueous solution were mixed as an anodizing electrolyte.In addition, high voltage was not applied to the goal value directly but gradually.Thus,anodizing voltage in the oxalic acid solution was far beyond 40 V commonly achieved,up to 150 V in this work,PAA with large pore diameter (about 200 nm)and large interpore distance (about 350 nm)were fabricated.Besides,how to remove the thick barrier layer formed at high voltages was also investigated.The results show that PAA template with through hole could be achieved after being immersed in 5wt% phosphoric aqueous solution for 180 min at 30 ℃,the thickness of barrier layer decreases at a rate of about 1 .2 6 nm/min under such condition.
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