Long-range ordered and atomic-scale control of graphene hybridization by photocycloaddition
Résumé
Chemical reactions converting sp 2 to sp 3 hybridization have been demonstrated to be a fascinating yet challenging route to functionalize graphene. So far, it has not been possible to precisely control the reaction sites nor their lateral order at the atomic/molecular scale. The application prospects have been limited for reactions requiring long soaking, heating, electric pulses, or probe tip press. Herein, we demonstrate a spatially-selective photocycloaddition reaction of a two-dimensional (2D) molecular network with defect-free basal plane of single-layer graphene. Directly visualized at the sub-molecular level, the cycloaddition is triggered by ultraviolet irradiation in ultrahigh vacuum, requiring no aid of the graphene Moiré pattern. The reaction involves both [2+2] and [2+4] cycloaddition, with the reaction sites aligned into a 2D extended and well-ordered array, inducing a bandgap for the reacted graphene layer. This work provides a solid base for designing and engineering graphene-based optoelectronic and microelectronic devices.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)