TY - DATA T1 - Deoxygenation of Graphene Oxide: Reduction or Cleaning? PY - 2015/12/16 AU - Helen R. Thomas AU - Stephen P. Day AU - William E. Woodruff AU - Cristina ValleĢs AU - Robert J. Young AU - Ian A. Kinloch AU - Gavin W. Morley AU - John V. Hanna AU - Neil R. Wilson AU - Jonathan P. Rourke UR - https://acs.figshare.com/articles/journal_contribution/Deoxygenation_of_Graphene_Oxide_Reduction_or_Cleaning_/2025837 DO - 10.1021/cm401922e.s001 L4 - https://ndownloader.figshare.com/files/3597129 KW - oxygen functionalized graphene sheets KW - carbonaceous debris complexed KW - graphene sheets KW - state NMR KW - graphene oxide KW - Graphene Oxide KW - base wash KW - oxidation debris KW - deoxygenation KW - process increases KW - monolayer nature N2 - We show that the two-component model of graphene oxide (GO), that is, composed of highly oxidized carbonaceous debris complexed to oxygen functionalized graphene sheets, is a generic feature of the synthesis of GO, independent of oxidant or protocol used. The debris present, roughly one-third by mass, can be removed by a base wash. A number of techniques, including solid state NMR, demonstrate that the properties of the base-washed material are independent of the base used and that it contains similar functional groups to those present in the debris but at a lower concentration. Removal of the oxidation debris cleans the GO, revealing its true monolayer nature and in the process increases the C/O ratio (i.e., a deoxygenation). By contrast, treating GO with hydrazine both removes the debris and reduces (both deoxygenations) the graphene sheets. ER -