| 초록 |
The controllable conformation of 3D graphene nanostructure is important when considering its possible applications as sensors, separations, lithium-ion batteries, and supercapacitors because of their prominent properties such as high surface area, high electrical conductivity, and thermal/mechanical stability. Herein, we demonstrate various types of 3D graphene nanostructures via chemical modification of graphene oxide and their conformational changes during the freeze drying process at different pH conditions. The oxygen-containing functional groups of chemically reduced graphene oxide sheets are deprotonated in aqueous solution at high pH conditions, so the sheets could be well-dispersed. Meanwhile, the O-containing groups are protonated at low pH conditions, so the sheets are likely to be agglomerated each other. Noticeably, we fabricate different graphene conformations such as dendrite-like structure and wire-like structure by controlling the pH condition. |
