  The unique thinness of two-dimensional materials enables control over
chemical phenomena at their surfaces by means of various gating techniques. For
example, gating methods based on field-effect-transistor configurations have
been achieved. Here, we report a molecular gating approach that employs a local
electric field generated by a polar self-assembled monolayer formed on a
supporting substrate. By performing Raman scattering spectroscopy analyses with
a proper data correction procedure, we found that molecular gating is effective
for controlling solid phase photochemical reactions of graphene with benzoyl
peroxide. Molecular gating offers a simple method to control chemical reactions
on the surfaces of two-dimensional materials because it requires neither the
fabrication of a transistor structure nor the application of an external
voltage.
