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Table 1
Parameters of the self-organized nanochannel arrays
	Method
	One-step	Three-step	Multi-electrolyte

Step	one	three	approximately one
Al thickness	approximately 2 μm	approximately 6 μm	approximately 2 μm
Electrolyte	H₃PO₄	H₃PO₄	H₂C₂O₄
Bias voltage	120 V	120 V	50 V
Processing time	30 min	90 min	approximately 30 min
Applied power	approximately 72 W	approximately 216 W	approximately 39 W
Circularity ± Δ	0.85 ± 0.1	0.87 ± 0.05	0.87 ± 0.05
Diameter	126.5 nm	122.4 nm	155.9 nm
Period ± Δ	203 ± 35 nm	206 ± 15 nm	202 ± 20 nm

The nanochannel arrays were obtained with the one-step, three-step, and multi-electrolyte-step AAO methods.
Chen and Chen Nanoscale Research Letters 2012 7:122 doi:10.1186/1556-276X-7-122

Table 1