Figure 4. DOS, NEXAFS and electrical conductivity measurements (IMAGE)
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a) Density of states. b) Carbon K-edge NEXAFS spectra. Insets show the simulated final-state molecular orbitals of the excited atoms for the first prominent peak (284.4 eV for the original C60, 285.0 eV for LOPC or 284.2 eV for the polymer crystal). Atoms marked blue are excited atoms (isovalue = 0.02). c) Direct current voltage–current curves of three membranes made by mixing each carbon with 5 wt% polytetrafluoroethylene. Inset shows an enlarged view of the ordinate. Electrical conductivities calculated from the curves are 2.44 × 10−9 S cm−1, 7.39 × 10−8 S cm−1 and 1.17 × 10−2 S cm−1, for the original C60, polymer crystal and LOPC, respectively. d) Resistivity testing for the LOPCs, graphite powder and rGO powder. The inset shows the change of g value with the annealing temperature of the LOPC.
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Institute for Basic Science
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