Atomically resolved imaging of highly ordered alternating fluorinated graphene

作者：Kashtiban Reza J; Dyson M Adam; Nair Rahul R; Zan Recep; Wong Swee L; Ramasse Quentin; Geim Andre K^*; Bangert Ursel; Sloan Jeremy

来源：Nature Communications, 2014, 5(1): 4902.

DOI：10.1038/ncomms5902

One of the most desirable goals of graphene research is to produce ordered two-dimensional (2D) chemical derivatives of suitable quality for monolayer device fabrication. Here we reveal, by focal series exit wave reconstruction (EWR), that C2F chair is a stable graphene derivative and demonstrates pristine long-range order limited only by the size of a functionalized domain. Focal series of images of graphene and C2F chair formed by reaction with XeF2 were obtained at 80 kV in an aberration-corrected transmission electron microscope. EWR images reveal that single carbon atoms and carbon-fluorine pairs in C2F chair alternate strictly over domain sizes of at least 150 nm(2) with electron diffraction indicating ordered domains %26gt;= 0.16 mu m(2). Our results also indicate that, within an ordered domain, functionalization occurs on one side only as theory predicts. In addition, we show that electron diffraction provides a quick and easy method for distinguishing between graphene, C2F chair and fully fluorinated stoichiometric CF 2D phases.

• 出版日期2014-9