In situ near-edge x-ray absorption fine structure spectroscopy investigation of the thermal defunctionalization of graphene oxide J. Vac. Sci. Technol. B 30, 061206 (2012); 10.1116/1.4766325 Nuclear quantum effects in the structure and lineshapes of the N 2 near-edge x-ray absorption fine structure spectrum J. Chem. Phys. 132, 094302 (2010); 10.1063/1.3324889Hydrogen bonding in acetone clusters probed by near-edge x-ray absorption fine structure spectroscopy in the carbon and oxygen K -edge regions Time dependent density functional theory study of the near-edge x-ray absorption fine structure of benzene in gas phase and on metal surfacesCharge redistribution at graphene/dielectric interfaces is predicated upon the relative positioning of the graphene Fermi level and the charge neutralization level of the dielectric. The authors present an angle-resolved near-edge x-ray absorption fine structure (NEXAFS) spectroscopy investigation of single-layered graphene transferred to 300 nm SiO 2 /Si with subsequent deposition of ultrathin high-j dielectric layers to form graphene/dielectric interfaces. The authors' NEXAFS studies indicate the appearance of a distinct pre-edge absorption for graphene/HfO 2 heterostructures (but not for comparable TiO 2 and ZrO 2 constructs). The hole doping of graphene with substantial redistribution of electron density to the interfacial region is proposed as the origin of the pre-edge feature as electron depletion renders part of the initially occupied density of states accessible for observation via NEXAFS spectroscopy. The spectral assignment is validated by calculating the NEXAFS spectra of electron-and hole-doped graphene using density functional theory. In contrast, a similarly sputtered metallic TiN layer shows substantial covalent interfacial hybridization with graphene.
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