Figure 2.

SEM and TEM images of the variable morphology of porous SiNWs etched with 0.3 M H2O2 for different times. ac 30 min, df 60 min, gi 90 min, jl 120 min, mo 180 min. The inset in n is the higher magnification image as marked

Lin et al. Nanoscale Research Letters 2010 5:1822-1828   doi:10.1007/s11671-010-9719-6