  The Diels-Alder surface modified top epitaxial graphene layer, with newly
created pair of sp3 carbon centres, results in abrupt minimization of
interlayer van der Waals interactions between two stacked graphene planes, and
escapes the wafer during post-reaction manipulation stage, leaving the layer
under it almost pristine-like. Above picture shows Diels-Alder functionalized
sp2/sp3 graphene adduct leaves the parent wafer. In this communication we
systematically address several fundamental questions in graphene surface
chemistry, which are of extreme importance for device fabrication, and in
successful implementation of covalently modified graphene in electronics
industry.
