  Vanadium disulfide (VS_{2}) attracts elevated interests for its
charge-density wave (CDW) phase transition, ferromagnetism, and catalytic
reactivity, but the electronic structure of monolayer has not been well
understood yet. Here we report synthesis of epitaxial 1T VS_{2} monolayer on
bilayer graphene grown by molecular-beam epitaxy (MBE). Angle-resolved
photoemission spectroscopy (ARPES) measurements reveal that Fermi surface with
six elliptical pockets centered at the M points shows gap opening at low
temperature. Temperature-dependence of the gap size suggests existence of CDW
phase transition above room temperature. Our observations provide important
evidence to understand the strongly correlated electron physics and the related
surface catalytic properties in two-dimensional transition-metal
dichalcogenides (TMDCs).
