Figure 4.

Top view FESEM images of Si nanowires. Formed by immersing the 20-nm Ag coated (a) sample A and (b) sample B in HF/H2O2 solution at 50°C for 3 min.

Hsu et al. Nanoscale Research Letters 2013 8:224   doi:10.1186/1556-276X-8-224
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