Tungsten–hydrogen complexes on graphene on Ir(111)

W and W – H complexes on graphene on Ir(111) were studied by means of low temperature scanning tunneling microscopy. H is found to coadsorb at the sample surface during W evaporation. Five different W-related structures on graphene on Ir(111) were found and characterized. They are identi fi ed as WH n, with n 0, 1, 2, 3, 4 = , as shown by electric fi eld induced dehydrogenation. They exhibit a number of peculiar effects, such as electric fi eld induced shifts of
spectroscopic features as well as reversible switching and charging effects. In addition, two different structures of H on Ir(111) were characterized.