3.6.2.9 Dynamics of H2, HD, D2 monolayers physisorbed on graphite

Crystalline hydrogenation of graphene by scanning tunneling microscope tip-induced field dissociation of H2

“…The interaction of hydrogen and pure carbon in amorphous or crystalline allotrope forms has been studied in a variety of contexts including interstellar catalysis [1], hydrogen storage [2], quantum fluids [3,4] and tunable nanomaterials [5,6]. Early studies of H 2 on graphite have explored a variety of gas/liquid/solid phase transitions at low temperature (< 20K) and low coverage (< 1 monolayer) [7,8], and similar behavior has been predicted for H 2 /graphene [9]. The interaction with atomic hydrogen is also of considerable interest for tuning graphene's electronic, magnetic, and chemical properties for a variety of applications.…”

“…Inverse FFT images do not show any clear domain structure, and all periodicities extend over the entire graphene region. These additional lattices could be due to multiple layers of condensed H 2 in the incommensurate solid region of H 2 /graphene phase diagram [7]. The FFT also shows spots near the center associated with the graphene Moiré pattern, which is unaffected by H 2 adsorption (c.f.,Fig.…”