Figure 3.

Set of ESEM images of the as-anodized NAA fabricated with different applied voltages. (a) 20, (b) 30, (c) 40, and (d) 50 V. All the samples were obtained after 10 min of anodization.

Rahman et al. Nanoscale Research Letters 2012 7:474   doi:10.1186/1556-276X-7-474
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