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Fig. 3 | Nanoscale Research Letters

Fig. 3

From: Unraveling the Morphological Evolution and Etching Kinetics of Porous Silicon Nanowires During Metal-Assisted Chemical Etching

Fig. 3

SEM images of the Si surface etched in solutions with H2O concentrations of a 46 M, b 48 M, and c 50 M and HF–H2O2 molar ratios of (i) 0.7, (ii) 0.75, (iii) 0.8, (iv) 0.85, (v) 0.9, (vi) 0.95, and (vii) 0.99. dg High-magnification SEM images of the samples in a (i), (ii), (iii), and (vii), respectively. Samples were etched in HF–H2O2 for 30 min

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