| AVS 58th Annual International Symposium and Exhibition | |
| Graphene and Related Materials Focus Topic | Monday Sessions |
| Session GR+TF+ET-MoA |
| Session: | Graphene: Electronic Properties and Charge Transport |
| Presenter: | Kathleen McCreary, University of California, Riverside |
| Authors: | K.M. McCreary, University of California, Riverside R.K. Kawakami, University of California, Riverside |
| Correspondent: | Click to Email |
While several experiments have separately investigated the doping of graphene by metallic and insulating adsorbates, the
transition from metallic to insulating behavior of the adsorbates has not yet been explored. We directly compare the effect of metallic titanium (Ti) and insulating titanium dioxide (TiO2) on the transport properties of single layer graphene. The deposition of Ti results in substantial n- type doping and a reduction of graphene mobility by charged impurity scattering. Subsequent exposure to oxygen largely reduces the doping and scattering by converting Ti into TiO2. In addition, we observe evidence for short-range scattering by TiO2 impurities.