Figure 1From: Template-free fabrication of silicon micropillar/nanowire composite structure by one-step etchingSEM images of silicon MP/NW structure. (a) Plane-view and (b) cross-sectional SEM images of silicon MP/NW structure obtained from the etching of silicon in the solution containing 4.6 M HF, 0.02 M AgNO3, and 0.05 M KMnO4 for 45 min.Back to article page