First Principles NMR Signatures of Graphene Oxide

Details First Principles NMR Signatures of Graphene Oxide First Principles NMR Signatures of Graphene Oxide

2010-04-02

arxiv.org/abs/1004.0333v1

Journal of Chemical Physics 2010, 133, 034502

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.3455715

Nuclear magnetic resonance (NMR) has been widely used in the graphene oxide (GO) structure study. However, the detailed relationship between its spectroscopic features and the GO structural configuration has remained elusive. Based on first principles $^{13}$C chemical shift calculations using the gauge including projector augmented waves (GIPAW) method, we provide a spectrum-structure connection. Chemical shift of carbon is found to be very sensitive to atomic environment, even with an identical oxidation group. Factors determining the chemical shifts for epoxy and hydroxy groups have been discussed. GO structures previously reported in the literature have been checked from the NMR point of view. The energetically favorable hydroxy chain structure is not expected to be widely existed in real GO samples according to our NMR simulations. The epoxy pair we proposed previously is also supported by chemical shift calculations.

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