Atomically Resolved Imaging of Highly Ordered Alternating Fluorinated Graphene
arXiv:1410.3787 · doi:10.1038/ncomms5902
Abstract
One of the most desirable goals of graphene research is to produce ordered 2D chemical derivatives of suitable quality for monolayer device fabrication. Here we reveal, by focal series exit wave reconstruction, 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 >/= 0.16 square micrometer. Our results also indicate that, within an ordered domain, functionalization occurs on one side only as theory predicts. Additionally we show that electron diffraction provides a quick and easy method for distinguishing between graphene, C2F chair and fully fluorinated stoichiometric CF 2D phases.
References in corpus (9)
- The electronic properties of graphene
- Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
- Energy Band Gap Engineering of Graphene Nanoribbons
- Control of graphene's properties by reversible hydrogenation
- Fluorographene: Two Dimensional Counterpart of Teflon
- On the roughness of single- and bi-layer graphene membranes
- Reversible Fluorination of Graphene: towards a Two-Dimensional Wide Bandgap Semiconductor
- Structures of Fluorinated Graphenes and Their Signatures
- Graphene re-knits its holes