| 초록 |
In this work, catalytically grown carbon nanofibers (CNFs) was activated with KOH to attain a high surface area with porous structure. The structural change of the CNFs through KOH activation was investigated by using SEM, TEM and XRD measurements. Nitrogen adsorption isotherms on CNFs were measured at 77 K to characterize the porous structure of the CNFs. As a result, the KOH activation was found to be effective to develop particular pore sizes on the CNF surface, increasing the surface area of the CNFs. The increase of surface area in KOH activation of CNFs was first ascribed to local broadening of graphene interstices or local burn-off of graphenes, which limited the surface area increase of the CNFs with the fiber structure maintained. The activation under severe conditions caused to destroy the fiber structure of the CNFs. |
