SEM cross-sectional tilted view of a macroporous layer grown on Ti/Au patterned silicon substrates. Geometry WP1 (a and b) and geometry WP2 (c). A 20-day-old HF/DMF mixture was used as electrolyte. The current density was set at the constant value of 91 mA/cm2 for 25 min.
Scheen et al. Nanoscale Research Letters 2012 7:395 doi:10.1186/1556-276X-7-395