TY - DATA T1 - Inside and Outside: X‑ray Absorption Spectroscopy Mapping of Chemical Domains in Graphene Oxide PY - 2015/12/16 AU - Luis R. De Jesus AU - Robert V. Dennis AU - Sean W. Depner AU - Cherno Jaye AU - Daniel A. Fischer AU - Sarbajit Banerjee UR - https://acs.figshare.com/articles/journal_contribution/Inside_and_Outside_X_ray_Absorption_Spectroscopy_Mapping_of_Chemical_Domains_in_Graphene_Oxide/2025813 DO - 10.1021/jz401717j.s001 L4 - https://ndownloader.figshare.com/files/3597105 KW - Graphene OxideThe oxidative chemistry KW - exfoliated graphene oxide KW - graphene oxide KW - carboxylic acid moieties KW - orientation KW - space chemical maps N2 - The oxidative chemistry of graphite has been investigated for over 150 years and has attracted renewed interest given the importance of exfoliated graphene oxide as a precursor to chemically derived graphene. However, the bond connectivities, steric orientations, and spatial distribution of functional groups remain to be unequivocally determined for this highly inhomogeneous nonstoichiometric material. Here, we demonstrate the application of principal component analysis to scanning transmission X-ray microscopy data for the construction of detailed real space chemical maps of graphene oxide. These chemical maps indicate very distinct functionalization motifs at the edges and interiors and, in conjunction with angle-resolved near-edge X-ray absorption fine structure spectroscopy, enable determination of the spatial location and orientations of functional groups. Chemical imaging of graphene oxide provides experimental validation of the modified Lerf–Klinowski structural model. Specifically, we note increased contributions from carboxylic acid moieties at edge sites with epoxide and hydroxyl species dominant within the interior domains. ER -