Evidence for a New Two-Dimensional C4H-Type Polymer Based on Hydrogenated Graphene

A new polymer with C4H stoichiometry based on graphene is synthesized in situ using template-induced polymerization of self-organizing hydrogen adsorbates on graphene. The polymerization is observed live on the surface of graphene by photoemission spectroscopy. Photoemission spectroscopy allows accurate determination of the carbon/hydrogen stoichiometry, an aspect that is extremely important for understanding functionalized graphene.