Figure 7.

SEM images of the fabricated structures. (a) PAN/silica composites with a mixing ratio of 2:1, (b) carbon/silica prepared by carbonization process, (c) macroporous carbon membranes obtained by selective etching of silica, and (d) Raman spectrum of the porous carbon material showing an amorphous carbon structure (I_D/I_G = 2.2).