Sulfur-doping in graphene and its high selectivity gas sensing in NO2

Sulfur-doping in graphene is of great importance because it could not only open the band-gap of graphene, but also improve the adsorption of NO
₂
over graphene. In this paper, a simple but efficient strategy was demonstrated to dope S atoms in graphene by introducing hydrogen sulfide gas flow as sulfur source at 1000°C. It's confirmed by transmission electron microscopy and Raman spectrum that S atoms were doped successfully by surface adsorption forming honeycomb carbon-sulfur compound crystal domains. Gas sensing test indicated that S-doped graphene showed high selectivity gas sensing to NO
₂
compared with NH
₃
, CH
₄
, SO
₂
and CO.