| 초록 |
Graphene paper that exhibits an excellent stabilized capacity, as high as 1300 mAh g-1 at a current rate of 60 mA g-1, as a lithium ion battery anode is fabricated and evaluated. The few-layer graphene used to make the graphene paper is prepared via the thermal reduction of graphite oxide. The graphene is then modified by a novel method utilizing inherent defects, namely epoxy groups, on the graphene as active sites for a reaction with methanol, 1-butanol, 1-hexanol, and 1-octanol. Gravimetric analysis, elemental analysis, and X-ray photoelectron spectroscopy results show that the reaction between intrinsic epoxy groups and the different alcohols to yield sporadic alkyl brushes on the graphene sheets proceeds as designed. Raman spectroscopy findings reveal that the graphitic structure of graphene with conjugated sp2 C=C bonds is strengthened by accompanying reactions such as solvothermal reduction, despite the covalent modification with alcohols. |
