Figure 3.

SEM images of AAO nanochannels after different steps and applied voltages. (a) 100 V, one-step; (b) 100 V, five-step; (c) 120 V, one-step; (d) 120 V, five-step; (e) 140 V, one-step; and (f) 140 V, five-step.

Chen and Chen Nanoscale Research Letters 2012 7:122   doi:10.1186/1556-276X-7-122
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