Figure 2From: Synthesis and Photoluminescence Properties of Porous Silicon Nanowire ArraysSEM and TEM images of the variable morphology of porous SiNWs etched with 0.3 M H2O2 for different times. a–c 30 min, d–f 60 min, g–i 90 min, j–l 120 min, m–o 180 min. The inset in n is the higher magnification image as markedBack to article page