  The adsorption and diffusion of F2 molecules on pristine graphene have been
studied using first-principles calculations. For the diffusion of F2 from
molecular state in gas phase to the dissociative adsorption state on graphene
surface, a kinetic barrier is identified, which explains the inertness of
graphene in molecular F2 at room temperature, and its reactivity with F2 at
higher temperatures. Studies on the diffusion of F2 molecules on graphene
surface determine the energy barriers along the optimal diffusion pathways,
which help to understand the high stability of fluorographene.
