| 초록 |
Graphene considered as a highly promising material for various applications such as a transparent conductive electrode, and supercapacitors. Most of large scale graphene-based application use a suspension or colloidal dispersion of GO or rGO. However, the oxidation process introduces significant defects in the as-made graphene, degrading its unique properties. Here, we present a simple and up-scalable method to produce highly repaired graphene oxide by introducing spherical multi-layered graphene balls with empty interiors. These graphene balls are prepared via chemical vapor deposition of Ni particles on the surface of GO. Defects in GO surfaces are well repaired during CVD process, with the help of nickel nanoparticles attached to the functional groups of GO surface, resulting in a high electrical conductivity of 18,620 S/m. In addition, the graphene balls on the GO surface effectively prevent restacking of the GO layers, thus providing a large surface area of 527 m2/g. |
