Production of alumina templates suitable for electrodeposition of nanostructures using stepped techniques
Production of alumina templates suitable for electrodeposition of nanostructures using stepped techniques
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DOI：
10.1016/j.electacta.2008.03.067
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发表时间：
2009-03
影响因子：
6.6
通讯作者：
J. M. Montero-Moreno;M. Belenguer;M. Sarret;C. Muller
中科院分区：
文献类型：
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作者：
J. M. Montero-Moreno;M. Belenguer;M. Sarret;C. Muller
近年来，使用阳极氧化铝作为模板通过电沉积获得纳米线和纳米管的可能性已经牢固地确立。该方法的主要问题是由将金属基底与电沉积浴隔离的阻挡层产生的高电阻。降低这种电阻的一种简单方法是在沉积之前执行额外的步骤：阻挡层减薄（BLT）工艺。已经描述了不同的BLT程序，尽管其中一些工作得很好，但该过程尚未得到很好的理解。在这里，我们提出了一个优化的步进恒电流BLT过程，并讨论如何实现BLT。作为反对的共同信念，BLT发生通过在多孔阳极氧化铝（PAA）的底部的树枝状多孔生长，我们表明，在减薄过程中，产生一个可控的分支形状的多孔结构。最后，我们还分析了使用分步技术，以获得比预期的草酸浴中更窄的孔的氧化铝模板。
In recent years, the possibility of using anodized aluminium as a template to obtain nanowires and nanotubes via electrodeposition has been firmly established. The main problem with this method is the high electrical resistance generated by the barrier layer that isolates the metallic base from the electrodeposition bath. An easy way to decrease this resistance is to perform an additional step before deposition: a barrier layer thinning (BLT) process . Different BLT procedures have been described and although some of them work well, the process is not yet well understood. Here, we present an optimized stepped galvanostatic BLT process and discuss how BLT is achieved. As opposed to the common belief that BLT takes place via dendritic porous growth at the bottom of the porous anodic alumina (PAA), we show that during thinning, a controllable branched-shaped porous structure is generated. Finally, we also analyze the use of stepped techniques to obtain alumina templates with narrower pores than expected in an oxalic acid bath.